Thermal stability of diagnostic targets plasmodium falciparum histidine rich protein II and plasmodium lactate dehydrogenase in rapid detection.

During the COVID-19 epidemic, blood samples are usually processed at 56 to attenuate the virus before pathogen detection. 71 blood samples of malaria patients reported by Shanghai Center for Disease Control and Prevention in 2017-2019 were collected, including 38 with Plasmodium falciparum infection, 8 P. malariae, 11 P. ovale and 14 P. vivax. The effect of inactivation on the thermal stability of P. falciparum histidine rich protein II (PfHRPII) and Plasmodium lactate dehydrogenase (pLDH) in blood samples was assessed before and after incubation at 56 for 30 min using the rapid diagnostic test (RDT) kit. The results showed that among the 38 P. falciparum T1-positive (PfHRPII) blood samples before heat treatment, 35 samples remained to be T1-positive (92.11%, 35/38, chi2=3.123, P>0.05) after heat treatment;while 54 blood samples (26 P. falciparum, 6 P. vivax, 10 P. ovale and 12 P. vivax) that were T2-positive (pLDH) before heat treatment turned to be T2-negative (positive rate 0, 0/54, chi2=87.755, P<0.01) after heat treatment. It was demonstrated that PfHRPII is stable during incubation at 56 for 30 min, while pLDH is unstable and degraded or inactivated during the heating. Therefore, the detection results of P. falciparum will not be affected by RDT, but diagnosis of the parasites other than P. falciparum in blood samples may be missed.Copyright © 2021, National Institute of Parasitic Diseases. All rights reserved.

Rapid protocols to support COVID-19 clinical diagnosis based on hematological parameters

Purpose: In December 2019, the Covid-19 pandemic began in the world. To reduce mortality, in addiction to mass vaccination, it is necessary to massify and accelerate clinical diagnosis, as well as creating new ways of monitoring patients that can help in the construction of specific treatments for the disease. Objective: In this work, we propose rapid protocols for clinical diagnosis of COVID-19 through the automatic analysis of hematological parameters using evolutionary computing and machine learning. These hematological parameters are obtained from blood tests common in clinical practice. Method: We investigated the best classifier architectures. Then, we applied the particle swarm optimization algorithm (PSO) to select the most relevant attributes: serum glucose, troponin, partial thromboplastin time, ferritin, D-dimer, lactic dehydrogenase, and indirect bilirubin. Then, we assessed again the best classifier architectures, but now using the reduced set of features. Finally, we used decision trees to build four rapid protocols for Covid-19 clinical diagnosis by assessing the impact of each selected feature. The proposed system was used to support clinical diagnosis and assessment of disease severity in patients admitted to intensive and semi-intensive care units as a case study in the city of Paudalho, Brazil. Results: We developed a web system for Covid-19 diagnosis support. Using a 100-tree random forest, we obtained results for accuracy, sensitivity, and specificity superior to 99%. After feature selection, results were similar. The four empirical clinical protocols returned accuracies, sensitivities and specificities superior to 98%. Conclusion: By using a reduced set of hematological parameters common in clinical practice, it was possible to achieve results of accuracy, sensitivity, and specificity comparable to those obtained with RT-PCR. It was also possible to automatically generate clinical decision protocols, allowing relatively accurate clinical diagnosis even without the aid of the web decision support system. © 2023, The Author(s), under exclusive licence to The Brazilian Society of Biomedical Engineering.

Resolution Consensus Statement Neutralizing monoclonal antibodies for treatment of COVID-19 - a role in the treatment of vulnerable categories of patients.

In December 2022, the Council of Experts was held. It purpose was to determine the place of virus-neutralizing monoclonal antibodies (NMA) in the ethiotropic treatment of COVID-19 in vulnerable categories of patients. The main issues were identified and their solutions were proposed. At the first visit of pregnant women due to COVID-19, proactive identification of risk factors and early prescription of NMA are recommended, preferably - with published safety data in this category of patients (casirivimab + imdevimab). In patients with oncological and other chronic (rheumatology, pulmonology, gastroenterology) diseases, prophylactic use of NMA is recommended. regardless of the severity of the disease. For patients with chronic pathology regardless of the severity of the disease an early prescription of ethiotropic therapy must be provided, combating the long-term circulation of the virus. To solve the problem of late treatment prescription, it is necessary to: use rapid tests, prescribe NMA if indicated, even if the patient presents late, introduce digital technologies to transfer information about COVID-19 cases between healthcare institutions (HI), create call centers for primary triage of patients, daily hospitals to reduce the burden on the HI. The issue of NMA using related to changes in their activity against new variants of SARS-CoV-2 remains relevant. Among the proposed solutions are: priority of indications over information about the activity of NMA, the diversification of the choice of NMA in HI, taking into account clinical experience, indications for use and prognosis of NMA activity, the use of combined forms of NMA (for example, casirivimab + imdevimab) or a combination of NMA with other means of ethiotropic therapy.Copyright © 2023, Dynasty Publishing House. All rights reserved.

Lateral flow assays for COVID-19

Rapid tests are essential tools for monitoring and containing the COVID-19 pandemic. Lateral flow assays (LFAs) have been introduced for the point-of-care COVID-19 diagnosis, using paper-based devices, and widely used for detecting antigen or antibody related to COVID-19. This book chapter includes a brief overview of the LFAs for rapid test of COVID-19, with focus on nanomaterials for bioconjugation, material selection, human sampling, antibody and antigen tests, viral nucleic acid detection, advantages, limitations, and future perspective. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2023. All rights reserved.

Investigation of imported malaria cases at a COVID-19 isolation point in Qingdao

The epidemiological data were collected from travellers who returned from Guinea on the 23rd of September, 2020 and were diagnosed with malaria at a C OVID -19 quarantine site in Qingdao, Shandong Province. The epidemiological characteristics, diagnosis and treatment of the cases and the epidemiology investigation and the rapid test screening results for other travellers on from the same flight and the interventions in reaction to the imported malaria cases were analyzed. The results showed that 4 out of 231 Guinean returned travellers had developed malaria symptoms, including chills and fever, during the isolation period. Rapid diagnostic test (RDT) indicated Plasmodium falciparum infection. Considering the patients ' travel history, clinical manifestations, and laboratory RDT test results, a confirmed diagnosis of imported P. falciparum malaria was made. The four malaria cases, who are male workers aged 29 to 55, were transferred to Jiaozhou People ' s Hospital for treatment. All four patients were administrated of artemether tablets upon diagnosis. One of the cases experienced severe malaria complications and were administrated with 12 doses (60 mg/dose) of artesunate intravenously for five days. The other three patients were treated with dihydroartemisinin and piperaquine phosphate tablets for one course of 8 tablets in 2 days (40 mg dihydroartemisinin and 320 mg piperaquine phosphate), respectively. Among the 231 returned travellers, 111 (48.1 %) had a history of malaria overseas. There were 23 positive cases detected by RDT, including the four symptomatic cases. The other 19 cases were asymptomatic. One of the asymptomatic cases became symptomatic three months later and was diagnosed as an imported P. malariae infection. Laboratory blood smear microscopic tests at the Jiaozhou City and Qingdao Municipal Center For Disease Control and Prevention showed negative results for the four malaria cases and the 19 RDT positive case. The samples from the four malaria cases were rechecked by the provincial reference laboratory of Shandong Institute of parasitic Disease. The results were negative for malaria infection by microscopic examination but positive for P. falciparum infection by nucleic acid test. It is suggested that during the routine control of COVID-19, the awareness of COVID-19 and malaria should be established among the returned travellers from high malaria-endemic areas. The health education "gate" should be moved forward to improve the treatment compliance for malaria cases and reduce the relapse or recrudescence caused by sub-optimal treatment.Copyright © 2022, Chin J Parasitol Parasit Dis. All rights reserved.

Covid-19 in Patients Presenting with Malaria-Like Symptoms at the Korle Bu Polyclinic, Accra

Intro: Malaria is one of Ghana's most frequent illnesses and the most common cause of febrile sickness. Most infectious diseases including COVID-19 and arboviral infections mimic malaria due to the overlapping of non-specific symptoms they both share.This study investigated COVID-19 in patients presenting with malaria-like symptoms at the Korle Bu Polyclinic, Accra. Method(s): This study enrolled 300 patients presenting with malaria-like symptoms aged <= 18. After consent was obtained from study patients, two to three millilitres of whole blood, nasopharyngeal and oropharyngeal swab samples was collected for screening of Plasmodium falciparum using malaria rapid diagnostic test, microscopy and nested PCR and SARS-CoV-2 using SARSCoV-2 antigen test and Real-time PCR respectively. The whole blood sample was also used for COVID-19 antibody test and full blood count using hematological analyser. Finding(s): The detection of SARS-CoV-2 by COVID-19 Rapid Antigen Test and Real-time PCR were 60/300 (20%) and 26/300 (8.7%) respectively. Delta variant was reported in most SARS-CoV-2 positives with CT values below 30. The prevalence of malaria by microscopy, RDT and nested PCR were 7/300 (2.3%), 7/300 (2.3%) and 8/300 (2.7%) respectively. The most common symptom experienced by the study patients at the polyclinic was headache (95%;57/60). Comorbidities reported were hypertension, diabetes, Asthma, hypertension and diabetes. Most of the study patients had been previously exposure to SARS CoV-2 (113/300) and 66.7% (34/51) of AstraZeneca vaccinated patients had no antibody. Conclusion(s): Due to the synergy of symptoms, screening for COVID-19 in patients presenting with malaria-like symptoms is vital for immediate diagnosis and treatment.Copyright © 2023

Monitoring the Temporal Trajectory of Sars-Cov-2 in Hong Kong - Daily Antigen Rapid Testing Surveillance (Darts) System

Intro: The number of PCR-confirmed cases may serve poorly as a surveillance data for a representative disease activity, due to its bias towards symptomatic cases or people having an identifiable risk exposure, and the high dependency on changing testing policy. We reported a large-scale ad-hoc community surveillance initiative, Daily Antigen Rapid Testing Surveillance (DARTS) System, using self-performed rapid antigen tests(RAT). Method(s): A representative cohort of 10000+ individuals was enrolled over the territory. Participants were divided into 7 sub-cohorts to achieve a rolling schedule with 1400+ individuals on a daily basis. Participant performed the RAT regularly irrespective of symptom or exposure history, with a self-sampled throat-and-nasal swab. RAT result and photo were reported on the same day of testing through an online platform. Daily point prevalence was disseminated on a real-time dashboard to inform the situation awareness(https://covid19.sph.hku.hk/dashboard). Finding(s): Since its launch during the peak of the fifth wave in March 2022, the system has tracked the changing trajectory of different phases of the Omicron pandemic, including the rapidly subsiding daily prevalence from an initial high value of 12.7% (8.4-18.7) in early March to a baseline of 0.6% (0.2-1.4) in early April, maintained with a non-zero baseline (0.1-0.3%) over May, and subsequent stepwise increase to 0.5% (0.2-1.2) in June. The reproduction number increased from 0.66(0.63,0.70) to 1.23(1.14,1.33) from March to June, signifying the gradual increase of residual Omicron transmission. Conclusion(s): Our DARTS system has demonstrated the feasibility of a participatory surveillance system using self-performed RAT, and its utility as an ad-hoc surveillance to timely reflect the rapidly changing epidemic trajectory. Regular testing irrespective of symptom and exposure risk helps to give more representative picture, including subclinical cases who also carried an implication of disease transmission. The use of RAT also helps to avoid the constraint of manpower and testing capacity, and has been quickly adopted for case definition.Copyright © 2023

Pancreatitis Secondary to Paxlovid-Induced Tacrolimus Toxicity

Introduction: Pancreatitis is a very common gastrointestinal disease that results in hospital admission. Early detection and treatment leads to better outcomes. This is the first reported case of pancreatitis secondary to elevated tacrolimus in a patient with prior renal transplantation after receiving Paxlovid for a COVID-19 infection. Case Description/Methods: A 57-year-old male with past medical history of 4 renal transplants secondary to posterior urethral valves who presented to the emergency room with acute onset epigastric pain for 24 hours. He was on tacrolimus 5 mg every 48 hours monotherapy for his immunosuppression. 10 days prior to his presentation he had developed chills and anxiety. He tested positive for COVID-19 at that time on a home rapid test. His symptoms had not significantly improved and given his immunosuppressed state he was given Paxlovid (Nirmatrelvir/ritonavir). He took 2 days of Paxlovid, however after his second day of treatment he developed severe epigastric pain requiring him to go to the emergency room. On admission his labs were notable for a lipase of 150 U/L (ULN 63 U/L). He underwent a CT scan was notable for an enlarged pancreatic head and neck with peripancreatic fat stranding (Figure). He also had a right upper quadrant ultrasound without any cholelithiasis and only trace sludge noted. His creatinine was noted to be 1.81 mg/dl which was above his baseline of 1.2 mg/dl. His tacrolimus trough level resulted at a level 45.6 ng/ml and later peaked at 82.2 ng/ml. His liver enzymes were normal. He was treated as acute pancreatitis with hydration and his tacrolimus was held with overall clinical improvement. Discussion(s): Tacrolimus is one of the most common medications used in solid organ transplantation. It is a calcineurin inhibitor that inhibits both T-lymphocyte signal transduction and IL-2 transcription. It is metabolized by the protein CYP3A and levels are monitored closely. Paxlovid is currently prescribed as an antiviral therapy for COVID-19 infection. The ritonavir compound in Paxlovid is potent inhibitor of CYP3A. Currently the guidelines do not recommend Paxlvoid as a therapeutic in patients taking tacrolimus as there is concern about increased drug levels. There have been several case reports of pancreatitis in setting of tacrolimus. This case report helps to demonstrate the need for close monitoring of therapeutics levels, especially in medications with high risk of drug to drug interaction to help prevent serious side effects such as tacrolimus induced pancreatitis.

SARS-CoV-2 Alpha Variant Infection of a Patient Immunized by Inactive Sinovac (CoronaVac) Vaccine

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) was first detected in December 2019, and shortly after pandemic has been declared by the World Health Organization (WHO) due to its unstoppable global spread. Considerable amount of effort has beenput around the World in order to develop a safe and effective vaccine against SARS-CoV-2. Inactivated and RNA vaccines have already passed phase three studies showing sufficient efficacy and safety, respectively. Nowadays, there is a noticeable dominance of SARS-CoV-2 variants with various mutations over the wild type SARS-CoV-2. However, there is no report showing the efficacy of these vaccines on these variants. This case study describes a thirty-eight-year-old male reported to be infected with SARS-CoV-2 alpha variant following two doses of inactive CoronaVac administration with a protective level of SARS-CoV-2 specific antibodies. The variant analysis of the virus reported to be positive for N501Y mutation.This is the first case in the literature demonstrating that inactive SARS-CoV-2 vaccine might have a lower efficacy on alpha variant.Copyright © 2022 Cenk Serhan Ozverel et al., published by Sciendo.

INTEGRATION OF SARS-CoV-2 RAPID ANTIGEN TEST IN HEALTH SERVICES IN KENYA AND CAMEROON

Background: Early diagnosis of COVID-19 is key to prevent severe cases and poor outcomes in vulnerable populations, including pregnant women and people living with HIV or infected with tuberculosis (TB). The feasibility of integration of SARS-CoV-2 antigen rapid diagnostic testing (Ag-RDT) into maternal neonatal, and child Health (MNCH);HIV;and TB clinics is unknown. Method(s): We analyzed data from a SARS-CoV-2 screen and test program implemented in 50 health facilities (25 in Kenya and 25 in Cameroon), integrating SARS-CoV-2 Ag-RDT in MNCH, HIV, and TB clinics between May and October 2022. Clients aged two and older attending MNCH, HIV, and TB clinics were offered SARS-CoV-2 screening, and those eligible were tested using SARS-CoV-2 Ag-RDT. Routine SARS-CoV-2 program data were captured through dedicated paper forms in Cameroon or an electronic medical record (EMR) interface in Kenya and transferred to a database for analysis. We estimated the proportion of clients screened and tested and the SARS-CoV-2 positivity rates. Result(s): Overall, 527,184 attendee visits were reported in Cameroon (282,404) and Kenya (244,780), with screening for COVID-19 symptoms and exposure performed in 256,033 (48.5%) with substantive variations between countries (62.6% in Cameroon and 32.4% in Kenya). Among the 256,033 screened, 19,058 (7.4%) were eligible for testing (9.0% in Cameroon and 3.9% in Kenya), of whom 12,925 (67.8%) were tested for SARS-CoV-2 with substantial variation in testing rates between countries (61.9% in Cameroon and 97.9% in Kenya) and clinics (59.9% in MNCH, 68.7% in HIV, and 92.8% in TB clinics). A total of 390 (3.0%) positive tests were identified (329 (3.3%) in Cameroon and 61 (2.0%) in Kenya). The estimated case detection rate was 1.26 (95% CI=0.76-1.75) per 1,000 attendee visits in Cameroon and 0.49 (95% CI=0.12-0.86) per 1,000 attendee visits in Kenya. Country integration strategy, facility level, setting, and clinic were independently associated with screening (Table 1) and testing. Conclusion(s): Integration of SARS-CoV-2 Ag-RDT in HIV, TB, and MNCH clinics was feasible in both countries despite challenges with low screening rates in Kenya and low testing rates in Cameroon. Decentralization of SARS-CoV-2 testing at different facility clinics allowed detection of SARS-CoV-2 cases among vulnerable populations. Integration strategies should consider facility settings (rural compared to urban) and additional human resources in high volume facilities to improve screening and testing rates.

An imported case of ovale malaria in Xinjiang during the epidemic period of COVID-19.

On December 13, 2020, Yutian County People's hospital reported one imported malaria case in Hotan, Xinjiang. The patient had worked and lived in Yaounde, Cameroon, from January to September 2020. He was infected with malaria twice in March and May 2020. Antimalarial treatment was administrated by the team doctor for 2-3 days in each treatment. The treatment was stopped after the symptoms improved. The patient returned to China on September 16 and was hospitalized on December 13 due to a high fever of 39! and upper respiratory symptoms. Multiple detections of COVID-19 nucleic acid showed negative results. Peripheral blood from the patient was taken for Plasmodium rapid diagnostic test (RDT), which showed a positive result suggesting non Plasmodium falciparum infection. Ring stage P. ovale was found in the blood smear. Nested PCR showed positive for P. ovale. A diagnosis of imported ovale malaria was made. The patient was administrated with 4 dihydroartemisinin piperaquine tablets and 3 primaquine phosphate tablets daily. The malaria parasite test became negative after 8 days of treatment. The patient was followed up for 3 months after discharge and had no symptoms of chills or fever.Copyright © 2022, National Institute of Parasitic Diseases. All rights reserved.

Prevalence and risk factors associated with SARS-CoV-2 infection among workers of Instituto Nacional de Salud del Nino, Peru, April 2020 to March 2021.

Objective: To determine the prevalence and risk factors associated with SARS-CoV-2 infection among workers of Instituto Nacional de Salud del Nino (INSN) from April 2020 to March 2021. Material(s) and Method(s): A non-experimental, descriptive, cross-sectional study. The sample consisted of 608 workers who tested positive for COVID-19 using a rapid antigen test. The COVID-19 clinical-epidemiological research sheets prepared by the Ministry of Health of Peru and self-administered by the workers were reviewed. The INSN Department of Epidemiology staff verified the completion of the sheets. The data was entered into a database, which was used for the respective statistical analysis. The study was approved by the INSN Institutional Research Ethics Committee (registration code: PI-17/21). Result(s): COVID-19 prevalence among INSN workers was 7.24 % from April 2020 to March 2021. Out of the workers with COVID-19, 71.4 % were women;83.4 % were in the 30 to 59 age range with an average age of 44.71 years;65.6 % were healthcare workers, most of whom were nursing technicians;and 56.9 % experienced symptoms, mainly fever/chills (12.2 %), cough (8.9 %), malaise (7.7 %), sore throat (6.7 %), stuffy nose (2.5 %) and headache (1.3 %). Most workers lived in Lima Centro districts (33.2 %). A significant association between sex, age groups, worker type and worker profile was found. Conclusion(s): COVID-19 prevalence among INSN workers was 7.24 %;the most frequent characteristics, which showed significant differences with the rest of the factors, were being a woman, healthcare worker and nursing technician. A total of 56.9 % of the workers experienced symptoms, only 20.9 % developed clinical signs and 10.9 % had comorbidities.Copyright © La revista. Publicado por la Universidad de San Martin de Porres, Peru.

Getting to Zero: Achievement of 95-95-95 and Declining Hiv Incidence in Eswatini

Background: Achieving UNAIDS global 95 targets among people living with HIV (PLHIV) is key to HIV epidemic control. Eswatini, a country with one of the severest HIV epidemics, has implemented an aggressive national HIV response with comprehensive HIV prevention and treatment services. We assessed progress towards these targets in the high HIV disease burden setting of Eswatini. Method(s): We compared 95-95-95 indicators and HIV incidence from two sequential Population-based HIV Impact Assessment (PHIA) surveys conducted in Eswatini in 2016 and 2021. These PHIAs were similarly designed as nationally representative household surveys among individuals 15 years and older. Respondents completed interviews and provided blood samples for HIV rapid testing (Determine and Unigold), antiretrovirals (ARV) testing, and viral load (VL) measurement. The first 95 (diagnosed PLHIV) was assessed by self-report or detectable ARVs;second 95 (on treatment) by self-report or detectable ARVs among diagnosed PLHIV, and third 95 (VL suppression, VLS) as VL < 1,000 copies/mL among PLHIV on treatment. Annual HIV incidence was estimated from recent infections (classified by HIV-1 LAg avidity assay, VL and ARV detection) using the formula recommended by the World Health Organization Incidence Working Group. Survey weights accounting for sample selection probabilities and adjusted for nonresponse and noncoverage were applied. Result(s): The 11,199 adults in the 2021 PHIA were at 94-97-96, while the 10,934 adults in the 2016 PHIA were at 87-89-91, a statistically significant increase of 5-10% in all 95 indicators (see Table). Target achievement varied by sex, but all 95 indicators improved among men (92-96-97 in 2021 vs 80-90-91 in 2016) and women (95-98-96 in 2021 vs 91-88-91 in 2016). Overall annual HIV incidence declined by 45% from 1.13% in 2016 to 0.62% in 2021 (p = 0.055). Annual HIV incidence in 2021 was nearly seven times higher among women (1.11%) than among men (0.17%). Conclusion(s): These findings reflect substantial progress toward HIV epidemic control, a remarkable achievement in the context of health, social and economic disruptions and challenges associated with the COVID-19 era. The 2021 data highlight remaining gaps in knowledge of HIV status, particularly among men, and HIV incidence reduction, particularly among women.

Covid-19 Self-Testing among Healthcare Workers and General Population in Malawi

Background: COVID-19 testing is critical for identifying cases to prevent transmission. SARS-CoV-2 self-testing has the potential to increase diagnostic testing capacity and to expand access to hard-to-reach areas in low-andmiddle- income countries. We investigated the feasibility and acceptability of COVID-19 self-sampling and self-testing using SARS-CoV-2 Ag-Rapid Diagnostic Tests. Method(s): Between July 2021 to February 2022, we conducted a mixedmethods cross-sectional study examining self-sampling and self-testing using Standard Q and Panbio COVID-19 Ag Rapid Test Device in Urban and rural Blantyre, Malawi. Health care workers and adults (18y+) in the general population were systematically sampled. Result(s): Overall, 1,330 participants were enrolled of whom 674 (56.0%) were female with 664 for self-sampling and 666 for self-testing. Overall mean age was 30.7y (standard deviation [SD] 9.6). Self-sampling usability threshold for Standard Q was 273/333 (82.0%: 95% CI 77.4% to 86.0%) and 261/331 (78.8%: 95% CI 74.1% to 83.1%) for Panbio. Self-testing threshold was 276/335 (82.4%: 95% CI 77.9% to 86.3%) and 300/332 (90.4%: 95% CI 86.7% to 93.3%) for Standard Q and Panbio, respectively. Agreement between self-sample results and professional test results was 325/325 (100%) and 322/322 (100%) for Standard Q and Panbio, respectively. For self-testing, agreement was 332/333 (99.7%: 95% CI 98.3 to 100%) for Standard Q and 330/330 (100%: 95% CI 99.8 to 100%) for Panbio. Odds of achieving self-sampling threshold increased if the participant was recruited from an urban site (odds ratio [OR] 2.15 95% CI 1.44 to 3.23, P < .01. Compared to participants with primary school education those with secondary and those with tertiary achieved higher self-testing threshold OR 1.88 (95% CI 1.17 to 3.01), P = .01 and 4.05 (95% CI 1.20 to13.63), P = .02, respectively. Conclusion(s): One of the first studies to demonstrate high feasibility of self-testing using SARS-CoV-2 Ag-RDTs in low- and middle-income countries potentially supporting large scale-up.

Ag-RDT MASS TESTING IN LARGE GATHERINGS TO IDENTIFY SARS-CoV-2 INFECTIONS IN KENYA

Background: In Africa, the 9.3 million COVID-19 cases and 174,993 related deaths reported between 2020 and 2022 are underestimated given the limited testing and reporting capacity. Mass testing with antigen-detecting rapid diagnostic tests (Ag-RDTs), including testing of asymptomatic individuals, is expected to improve the identification of SARS-CoV-2 infections and enable immediate clinical management, isolation of patients, contact tracing, and quarantining of contacts. We offered mass Ag-RDT testing in large gatherings to determine the SARS-CoV-2 case detection rate, acceptance of mass testing, the prevalence of circulating variants, and the cost of implementation. Method(s): In 49 high-attendance facilities in Kiambu County identified as possible points of community-based transmission, individuals two years old and older were offered COVID-19 testing and vaccination. Those accepting testing were enrolled in the study after providing written informed consent. A questionnaire was administered and a nasopharyngeal swab was collected. Those testing positive and those testing negative but with COVID-19 symptoms were referred for PCR testing and genome sequencing. Data were analyzed using descriptive statistics. The total cost of implementing the community testing was estimated from a health system perspective using a micro-costing method. Result(s): From June-September 2022, 4,062 individuals were offered testing (mean age 39 years, 2,114 (58.6%) were male). The testing acceptance was 78.1% (3,174/4,062) 95%CI, 76.9%-79.5%). The case detection rate was 34/3,174 (1.07%: 95%CI 0.7%-1.4%). Table 1 shows the testing and case detection rates by facility type. Of the 34 positive cases, 11 (32%) were asymptomatic. A PCR result was available for 27 Ag-RDT positive participants and 13 Ag-RDT negative participants with SARS-COV-2 symptoms and was positive in 24 (88.9%) and 4 (30.8%) respectively. Circulating variants were identified in 11 participants (Omicron 22A: 36% and 22B: 64%);15 samples could not be sequenced due to CT values >35. Community mobilization was the major cost driver (26%) followed by the purchase of SARS-CoV-2 Ag-RDT (20.5%). The total cost of the intervention was US$50,538;the cost per individual tested was US$15.89 and US$1,484 per new COVID-19. Conclusion(s): Targeted mass community testing using SARS-CoV-2 Ag-RDT is a feasible and affordable strategy in identifying priority areas for vaccination and early treatment for individuals with COVID-19.

Verification of the Performance of the Panbio COVID-19 Ag Rapid Test Device for Implementation in the Clinical Laboratory

Objectives: The Panbio COVID-19 Ag Rapid Test Device (Panbio COVID-19 Ag, Abbott Rapid Diagnostics) is a lateral flow immunochromatographic assay targeting the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) nucleoprotein in nasopharyngeal specimens for the diagnosis of coronavirus disease 2019 (COVID-19). This study aimed to verify the performance of the Panbio COVID-19 Ag for implementation in clinical laboratories. Method(s): Sixty nasopharyngeal swab specimens (30 positive and 30 negative) dipped in transport medium, and COVID-19 was confirmed using real-time RT-PCR using Allplex SARS-CoV-2 assay (Seegene), were tested using the Panbio COVID-19 Ag. Reproducibility was evaluated using positive and negative control materials. Sensitivity and specificity were calculated based on the results of realtime RT-PCR as the standard test method. Result(s): Reproducibility was confirmed by the consistent results of repeated tests of the quality control materials. The overall sensitivity and specificity of Panbio COVID-19 Ag were 50.0% and 100.0%, respectively. Panbio COVID-19 Ag demonstrated high sensitivity (88.2%) in analyzing the detection limit cycle threshold (Ct) value of 26.67 provided by the manufacturer as a positive criterion, and the sensitivity was 100.0% for the positive criterion of Ct values <25, although it was less sensitive for Ct > 25. Conclusion(s): Considering the high sensitivity for positive samples with Ct values <25 and the rapid turnaround of results, Panbio COVID-19 Ag can be used in clinical laboratories to diagnose COVID-19 in limited settings. Copyright © 2023 Ewha Womans University College of Medicine and Ewha Medical Research Institute.

Rapid multiplex PCR for respiratory viruses reduces time to result and improves clinical care: Results of a systematic review and meta-analysis.

OBJECTIVES: The clinical impact of rapid sample-to-answer "syndromic" multiplex polymerase chain reaction (PCR) testing for respiratory viruses is not clearly established. We performed a systematic literature review and meta-analysis to evaluate this impact for patients with possible acute respiratory tract infection in the hospital setting. METHODS: We searched EMBASE, MEDLINE, and Cochrane databases from 2012 to present and conference proceedings from 2021 for studies comparing clinical impact outcomes between multiplex PCR testing and standard testing. RESULTS: Twenty-seven studies with 17,321 patient encounters were included in this review. Rapid multiplex PCR testing was associated with a reduction of - 24.22 h (95% CI -28.70 to -19.74 h) in the time to results. Hospital length of stay was decreased by -0.82 days (95% CI -1.52 to -0.11 days). Among influenza positive patients, antivirals were more likely to be given (RR 1.25, 95% CI 1.06-1.48) and appropriate infection control facility use was more common with rapid multiplex PCR testing (RR 1.55, 95% CI 1.16-2.07). CONCLUSIONS: Our systematic review and meta-analysis demonstrates a reduction in time to results and length of stay for patients overall along with improvements in appropriate antiviral and infection control management among influenza-positive patients. This evidence supports the routine use of rapid sample-to-answer multiplex PCR testing for respiratory viruses in the hospital setting.

Regional spread of Candida auris.

The geographical routes and time schedule of spread of C. auris - the fungus first identified in 2009 are discussed. Data on the increasing frequency of C. auris infections and rapid dissemination of the fungus from the regions of origin - southern Asia, eastern Asia, southern Africa and southern America - towards different regions of all continents except Antarctica, especially after 2016, are presented. Three different clades are encountered in Great Britain, all four clades - in the USA. South Asian clade is currently present in Russia: the introduction was associated with labor migration from Middle Asia. The necessity of C. auris surveillance, essential for the establishment of sources and routes of transmission and dissemination of different clades is emphasized. A window of possibilities is still present to prevent further spread of the fungus with the ability to cause outbreaks of hospital infections including intensive care departments. Rapid implementation of preventive measures during the pandemic of COVID-19 are needed taking into account introduction of fungus in new countries and clinics, as well as increased frequency of C. auris infections in some hospitals for patients infected with SARS-CoV-2 virus.Copyright © 2021, Interregional Association for Clinical Microbiology and Antimicrobial Chemotherapy. All rights reserved.

Anosmia in healthcare workers affected with COVID-19: Prevalence and associated factors

Background: COVID-19 is the most important health problem in the world nowadays. Since the publication of the first cases, the symptoms have become more numerous. Anosmia has been recently recognized as a frequent and relevant symptom for the detection of COVID-19, especially in pauci-symptomatic forms. Objective(s): To determine the prevalence of anosmia in health care workers affected by SARS-COV2 and to identify its associated factors. Method(s): This is a cross-sectional analytical study, carried out over a six-month period, which included all healthcare workers of Farhat Hached Academic Hospital of Sousse, Tunisia, affected by SARS-COV2 and confirmed by polymerase chain reaction or antigen rapid test. Result(s): A total of 474 healthcare workers were enrolled with a mean age of 41.02+/-10.67 years and a sex ratio of 0.2. The gynecology department was the most represented one (13.9%). Nurses were the most affected (31.4%). Hospitalization was required for 16 patients (3.4%). The average time of work was 17.04 +/- 11.6 days. Anosmia persisted for more than 90 days in 35 patients (7.4%). After multiple binary logistic regression, anosmia was statistically associated with female gender (p = 0.001;ORIC95%:2.46 [1.4-4.2]) and blue-collar occupational category (p = 0.002;ORIC95%:3.1 [1.5-6.5]). A significant association was also noted between the presence of anosmia and professional seniority (p = 0.019;OR IC95%: 0.97 [0.95-0.99]) and the duration of work (p = 0.03;OR IC95%: 0.97 [0.95-0.99]). Conclusion(s): Although anosmia seems to be frequent in COVID-19 patients, there is still not enough evidence to affirm that it is a strong predictor of the diagnosis of COVID-19.