Dual anti-viral treatment for persistent COVID-19 in immunocompromised hemato-oncological patients is associated with a favorable prognosis and minor side effects.

In hemato-oncological patients, COVID-19 can present as a persistent infection with ongoing symptoms and viral replication over a prolonged period of time. Data are scarce on the preferred treatment options for these patients. We describe our experience with a five-day course of dual anti-viral treatment with remdesivir and nirmatrelvir/ritonavir for hemato-oncological immunocompromised patients with persistent COVID-19. Fifteen patients with a history of lymphoma, CLL, and MM were included. Eight were male, median age was 74. All patients had an immediate clinical and virological response. In 73 % of patients, PCR for SARS-CoV-2 became negative at the end of treatment and the rest had an increase in PCR cycle threshold (CT) values, with a median increase of 6 cycles. After a follow-up of three months, 60 % of patients remained in full clinical and virological remission. None required invasive mechanical ventilation or died. The side effects we observed, neutropenia, lactatemia and elevated transaminases, were mild and almost all transient in nature. We conclude that dual anti-viral treatment appears to be a valid treatment option for persistent COVID-19.

Comparative analysis of CRP as a biomarker of the inflammatory response intensity among common viral infections affecting the lungs: COVID-19 versus influenza A, influenza B and respiratory syncytial virus.

Severe acute respiratory syndrome-corona virus 2 (SARS-CoV-2) is associated with significant morbidity and mortality. C-reactive protein (CRP) is a useful inflammatory biomarker for patients admitted with an infection. This study aimed to compare CRP level as an indicator of inflammation severity between SARS-CoV-2 and common respiratory viral infections. A cross-sectional study of all adult patients hospitalized in the internal medicine department, geriatric department, or internal intensive care unit between 02/2012 and 06/2021 with laboratory-confirmed respiratory viral infection was performed. SARS-CoV-2, influenza A, influenza B, and respiratory syncytial virus (RSV) were studied. Patients with laboratory-confirmed concurrent viral or bacterial infections were excluded. Patients with malignancy were also excluded. Age, gender, comorbidities, and CRP level upon admission were compared between groups. Univariate and multivariable analyses were applied. Among 1124 patients, 18.2% had SARS­CoV­2, 48.3% influenza A, 18.9% RSV, and 14.6% influenza B. SARS­CoV­2 patients were significantly younger (median 69.4 vs. ≥ 76 years) and had lower Charlson score (median 3 vs. ≥ 4 in other groups) compared to patients with other viral pathogens. After adjustment for patients' age, gender and comorbidities, SARS­CoV­2 patients had a higher probability (OR = 1.84-2.02, p < 0.01) of having CRP values in the upper quartile (> 117 mg/L) compared to all other viral pathogens while between all others there was no significant difference. To conclude, a higher CRP level upon admission is approximately twice more common among SARS-CoV-2 patients compared to other widespread respiratory viruses which may demonstrate the higher intensity of inflammation caused by SARS-CoV-2.

Nosocomial transmission of MPOX virus to health care workers -an emerging occupational hazard: A case report and review of the literature.

We present an unusual case of monkeypox (MPOX) virus transmission to a dermatology resident during examination of affected patients. Viral DNA sequencing led to the identification of the most likely contact. This case, along with a review of all published cases so far, emphasizes the possible hazard of MPOX transmission to health care personnel, even when wearing personal protective equipment. It also emphasizes the need for maintaining high index of suspicion when examining patients with new dermatological lesions and strict compliance with the revised Centers for Disease Control and Prevention recommendations for specimen collection from such patients.

Diagnosis of Monkeypox infection: Validation of two diagnostic kits for viral detection using RT-PCR.

Monkeypox virus, a zoonotic Orthopox DNA virus was rarely reported outside of African regions until April 2022. Since then, thousands of cases have been reported worldwide. In order to cope with the increasing need for laboratory diagnosis, the availability of reliable commercial PCR assays is of paramount importance. In this study we compared the diagnostic performance of two commercial real-time (RT)-PCR assays, the Novaplex™ MPXV Assay and the Bio-Speedy® Monkeypox Virus qPCR Kit, for the detection of Monkeypox virus (MPXV) DNA from 154 human samples. These assays were compared to a recently published in-house assay that included a general MPXV target (G2T) and a West African specific target (genericWA). All assays demonstrated 100% specificity. While sensitivity of the Novpalex assay was 100% the sensitivity of the other assays was lower; 94% for the Bio-speedy assay and G2R assay and 88% for the genericWA assay. The sensitivity differences between the methods manifested almost entirely in those pharyngeal samples in which the Ct values were high (≥35). The Novaplex™ MPXV Assay showed higher Ct values compared with the other methods with a median of 27.1 compared with the Bio-Speedy assay (median 15.8, p < 0.001), the G2R assay (median 23.5, p < 0.001) and the genericWA assay (median 23.6, p < 0.001). For all 4 methods, the Ct values were higher in samples taken from oropharynx compared with samples from rectal and pustule swabs.

An outbreak of severe acute respiratory coronavirus virus 2 (SARS-CoV-2) infections among hospital personnel with high mRNA vaccine uptake.

Real-world studies have demonstrated impressive effectiveness of the BNT162b2 COVID-19 vaccine in preventing symptomatic and asymptomatic SARS-CoV-2 infection. We describe an outbreak of SARS-CoV-2 infections in a hospital with high vaccine uptake. We found a low secondary attack rate (7%), suggesting low infectivity of vaccinated persons with vaccine breakthrough SARS-CoV-2 infections.

Mpox Presenting as Proctitis in Men Who Have Sex With Men.

In our cohort of 70 patients of men who have sex with men (MSM) with mpox, more than one-third presented with proctitis. In two-thirds of proctitis patients, there was no typical rash upon presentation, and in one-fifth, there was no rash at all, making the diagnosis a challenge. A rectal swab for mpox polymerase chain reaction (PCR) can be diagnostic.

Drivers of adaptive evolution during chronic SARS-CoV-2 infections.

In some immunocompromised patients with chronic severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection, considerable adaptive evolution occurs. Some substitutions found in chronic infections are lineage-defining mutations in variants of concern (VOCs), which has led to the hypothesis that VOCs emerged from chronic infections. In this study, we searched for drivers of VOC-like emergence by consolidating sequencing results from a set of 27 chronic infections. Most substitutions in this set reflected lineage-defining VOC mutations; however, a subset of mutations associated with successful global transmission was absent from chronic infections. We further tested the ability to associate antibody evasion mutations with patient-specific and virus-specific features and found that viral rebound is strongly correlated with the emergence of antibody evasion. We found evidence for dynamic polymorphic viral populations in most patients, suggesting that a compromised immune system selects for antibody evasion in particular niches in a patient's body. We suggest that a tradeoff exists between antibody evasion and transmissibility and that extensive monitoring of chronic infections is necessary to further understanding of VOC emergence.

Evaluation of Biotrin, Serion and Euroimmun commercial assays for the detection of parvovirus B19-specific IgM and IgG antibodies.

Diagnosis of parvovirus B19 (B19) infection in small-medium size clinical laboratories is most often done by nonautomated enzyme immunoassays (EIAs). Using 195 specimens we compared the analytical performance of Biotrin (Dublin, Ireland), Euroimmun (Lubeck, Germany), and Serion (Würzburg, Germany) EIAs. Sensitivity, specificity, and concordance to Biotrin assay were calculated. Overall complete agreement in the IgG and IgM results was 88.7% (173/195) and 75.9% (148/195) samples, respectively. When equivocal results were considered positive, Serion and Euroimmun highly agreed (>93.8%) with Biotrin in the IgG serology. Serion had better IgM sensitivity and specificity than Euroimmun when compared to Biotrin, although more Serion IgM equivocal results needed reflex testing. Clinical interpretation by all three assays was identical in 83% of the samples. We concluded that overall the performance of these assays was similar and both Serion and Euroimmun could be a suitable replacement for the Biotrin.

Molecular Diagnosis of Cat Scratch Disease: a 25-Year Retrospective Comparative Analysis of Various Clinical Specimens and Different PCR Assays.

Cat-scratch disease (CSD), caused primarily by Bartonella henselae, is a common etiology of infectious regional lymphadenopathy. Lymphadenopathy is preceded by a primary inoculation lesion and may progress to suppuration. Laboratory diagnosis of CSD is hampered by the limitations of available confirmatory tests. PCR, in general, is highly sensitive and specific; however, clinical sensitivity in CSD varies greatly between studies. We aimed to identify clinical specimens and PCR assays best suited for CSD diagnosis using a national CSD registry and a uniform case definition. Different clinical specimens and PCR assays, including conventional and real-time PCR, were evaluated. PCR was positive in 335/390 (86%) CSD patients and 425/482 (88%) PCR tests. The highest PCR sensitivity was achieved in lymph node pus aspirates (96%; n = 278 tests) followed by primary lesions (88%; n = 50), lymph node fine needle aspirations (85%; n = 46), lymph node biopsy specimens (73%; n = 91) and paraffin-embedded lymph nodes (59%; n = 17), (P < 0.001). Sensitivity was similar in all types of PCR assays studied. PCR negative predictive value of pus aspirate and lymph node biopsy specimen patient groups was 82% and 72%, respectively. Specificity was 100% based on 125 non-CSD patients with negative PCR. In conclusion, the specimen type rather than the PCR assay type has a major impact on CSD molecular diagnosis. We assume that the inadequate sensitivity of the biopsy specimens was due to sampling errors or the presence of inhibitory factors. Primary lesions should be sampled more frequently for CSD diagnosis. Physicians should be aware of the low PCR negative predictive value of lymph node biopsy specimens. IMPORTANCE Polymerase chain reaction (PCR) for the detection of Bartonella henselae is an important tool for the diagnosis of cat scratch disease (CSD); however, clinical sensitivity varies greatly between studies. The current study shows that the specimen type, with pus aspiration, fine needle aspiration, and primary inoculation lesion having significantly higher sensitivity than fresh or formalin-fixed paraffin-embedded lymph node biopsy specimen, rather than the type of the PCR assay, whether a conventional or a real-time assay, has a major impact on the performance of diagnostic PCR for CSD. The new data provide new tools for the clinical microbiologist when interpreting the results of the PCR assays. Primary inoculation lesions, although easily accessible, are often neglected and should be sampled more frequently for molecular diagnosis of CSD. Physicians should be aware that negative PCR, particularly if performed on fresh or paraffin-embedded lymph node biopsy specimens, does not exclude CSD.

Association of a Third Dose of BNT162b2 Vaccine With Incidence of SARS-CoV-2 Infection Among Health Care Workers in Israel.

Importance: Administration of a BNT162b2 booster dose (Pfizer-BioNTech) to fully vaccinated individuals aged 60 years and older was significantly associated with lower risk of SARS-CoV-2 infection and severe illness. Data are lacking on the effectiveness of booster doses for younger individuals and health care workers. Objective: To estimate the association of a BNT162b2 booster dose with SARS-CoV-2 infections among health care workers who were previously vaccinated with a 2-dose series of BNT162b2. Design, Setting, and Participants: This was a prospective cohort study conducted at a tertiary medical center in Tel Aviv, Israel. The study cohort included 1928 immunocompetent health care workers who were previously vaccinated with a 2-dose series of BNT162b2, and had enrolled between August 8 and 19, 2021, with final follow-up reported through September 20, 2021. Screening for SARS-CoV-2 infection was performed every 14 days. Anti-spike protein receptor binding domain IgG titers were determined at baseline and 1 month after enrollment. Cox regression with time-dependent analysis was used to estimate hazard ratios of SARS-CoV-2 infection between booster-immunized status and 2-dose vaccinated (booster-nonimmunized) status. Exposures: Vaccination with a booster dose of BNT162b2 vaccine. Main Outcomes and Measures: The primary outcome was SARS-CoV-2 infection, as confirmed by reverse transcriptase-polymerase chain reaction. Results: Among 1928 participants, the median age was 44 years (IQR, 36-52 years) and 1381 were women (71.6%). Participants completed the 2-dose vaccination series a median of 210 days (IQR, 205-213 days) before study enrollment. A total of 1650 participants (85.6%) received the booster dose. During a median follow-up of 39 days (IQR, 35-41 days), SARS-CoV-2 infection occurred in 44 participants (incidence rate, 60.2 per 100 000 person-days); 31 (70.5%) were symptomatic. Five SARS-CoV-2 infections occurred in booster-immunized participants and 39 in booster-nonimmunized participants (incidence rate, 12.8 vs 116 per 100 000 person-days, respectively). In a time-dependent Cox regression analysis, the adjusted hazard ratio of SARS-CoV-2 infection for booster-immunized vs booster-nonimmunized participants was 0.07 (95% CI, 0.02-0.20). Conclusions and Relevance: Among health care workers at a single center in Israel who were previously vaccinated with a 2-dose series of BNT162b2, administration of a booster dose compared with not receiving one was associated with a significantly lower rate of SARS-CoV-2 infection over a median of 39 days of follow-up. Ongoing surveillance is required to assess durability of the findings.

Evolution of spike mutations following antibody treatment in two immunocompromised patients with persistent COVID-19 infection.

Immunocompromised patients have an increased risk of persistent COVID-19 disease. We report here the clinical course of two patients with hematologic malignancies hospitalized due to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. In both patients, viral evolution including new spike gene mutations that occurred following treatment with anti-SARS-CoV-2 antibodies preparations, including convalescent plasma and bamlanivimab. These cases demonstrate the possibility of antibody-resistant SARS-CoV-2 infections evolution in immunocompromised patients.

C-reactive protein velocity discriminates between acute viral and bacterial infections in patients who present with relatively low CRP concentrations.

BACKGROUND: To assess the utility of C-reactive protein (CRP) velocity to discriminate between patients with acute viral and bacterial infections who presented with relatively low CRP concentrations and were suspected of having a bacterial infection. METHODS: We analyzed a retrospective cohort of patients with acute infections who presented to the emergency department (ED) with a relatively low first CRP measurement (CRP1) ≤ 31.9 mg/L and received antibiotics shortly after. We then calculated C-reactive protein velocity (CRPv), milligram per liter per hour, for each patient based on CRP1 and the second CRP value (CRP2) measured within the first 24 h since admission. Finally, we compared CRPv between patients with bacterial and viral infections. RESULTS: We have presently analyzed 74 patients with acute bacterial infections and 62 patients with acute viral infections at the mean age of 80 and 66 years respectively, 68 male and 68 female. CRP1 did not differ between both groups of patients (16.2 ± 8.6 and 14.8 ± 8.5 for patients with viral and bacterial infections respectively, p value = 0.336). However, the CRP2 was significantly different between the groups (30.2 ± 21.9 and 75.6 ± 51.3 for patients with viral and bacterial infections respectively, p-value < 0.001) and especially the CRPv was much higher in patients with acute bacterial infections compared to patients with acute viral infections (0.9 ± 1.2 and 4.4 ± 2.7 respectively, p-value < 0.001). CONCLUSION: CRPv and CRP2 are useful biomarkers that can discriminate significantly between patients who present with acute bacterial and viral infections, and relatively low CRP concentration upon admission who were suspected of having a bacterial infection.

Unraveling a Nosocomial Outbreak of COVID-19: The Role of Whole-Genome Sequence Analysis.

BACKGROUND: The coronavirus disease 2019 (COVID-19) pandemic poses many epidemiological challenges. The investigation of nosocomial transmission is usually performed via thorough investigation of an index case and subsequent contact tracing. Notably, this approach has a subjective component, and there is accumulating evidence that whole-genome sequencing of the virus may provide more objective insight. METHODS: We report a large nosocomial outbreak in 1 of the medicine departments in our institution. Following intensive epidemiological investigation, we discovered that 1 of the patients involved was suffering from persistent COVID-19 while initially thought to be a recovering patient. She was therefore deemed to be the most likely source of the outbreak. We then performed whole-genome sequencing of the virus of 14 infected individuals involved in the outbreak. RESULTS: Surprisingly, the results of whole-genome sequencing refuted our initial hypothesis. A phylogenetic tree of the samples showed multiple introductions of the virus into the ward, 1 of which led to a cluster of 10 of the infected individuals. Importantly, the results pointed in the direction of a specific index patient that was different from the 1 that arose from our initial investigation. CONCLUSIONS: These results underscore the important added value of using whole-genome sequencing in epidemiological investigations as it may reveal unexpected connections between cases and aid in understanding transmission dynamics, especially in the setting of a pandemic where multiple possible index cases exist simultaneously.

Laboratory Diagnosis of 37 Cases of Bartonella Endocarditis Based on Enzyme Immunoassay and Real-Time PCR.

Bartonella spp., mostly Bartonella quintana and B. henselae, are a common cause of culture-negative endocarditis. Serology using immunofluorescence assay (IFA) and PCR performed on cardiac tissues are the mainstays of diagnosis. We developed an enzyme immunoassay (EIA) and a novel multiplex real-time PCR assay, utilizing Bartonella genus-specific, B. henselae-specific, and B. quintana-specific SimpleProbe probes, for diagnosis of Bartonella endocarditis. We aimed to evaluate the performance of these assays. Thirty-seven patients with definite endocarditis, 18 with B. henselae, 18 with B. quintana, and 1 with B. koehlerae, were studied. Diagnosis was confirmed by conventional PCR and DNA sequencing of surgical cardiac specimens. Similar to the case with IFA, anti-Bartonella IgG titers of ≥1:800 were found in 94% of patients by EIA; cross-reactivity between B. henselae and B. quintana precluded species-specific serodiagnosis, and frequent (41%) but low-titer cross-reactivity between Coxiella burnetii antibodies and B. henselae antigen was found in patients with Q fever endocarditis. Low-titer (1:100) cross-reactivity was uncommonly found also in patients with brucellosis and culture-positive endocarditis, particularly Enterococcus faecalis endocarditis. Real-time PCR performed on explanted heart valves/vegetations was in complete agreement with results of sequence-based diagnosis with characteristic melting curves. The genus-specific probe identified five additional endocarditis-associated Bartonella spp. at the genus level. In conclusion, EIA coupled with a novel real-time PCR assay can play an important role in Bartonella endocarditis diagnosis and expand the diagnostic arsenal at the disposal of the clinical microbiologist. Since serology remains a major diagnostic tool, recognizing its pitfalls is essential to avoid incorrect diagnosis.

Impact of rotavirus vaccine on admissions due to acute gastroenteritis and rotavirus gastroenteritis in Israel.

AIM: We examined the impact of insertion of the Rotavirus vaccine (RVV) into the Israeli National Immunisation Programme (NIP) on hospitalisations due to both acute gastroenteritis (AGE) and Rotavirus gastroenteritis (RVGE) in children. METHODS: We retrospectively analysed the medical records of children aged <5 years admitted with a diagnosis of AGE between 2008 and 2016 in two children's hospitals in central Israel. Clinical, laboratory, microbiological data and RV immunisation status were retrieved. Data were compared before and after the introduction of the RVV into the NIP. RESULTS: A total of 2042 children were admitted with AGE. Hospitalisations due to AGE and RVGE decreased from 3310 to 1950 and from 1027 to 585 per 100 000 admissions, respectively, after the RVV (relative risk reduction (RRR) of 41% and 43%, respectively). RV remained the most common pathogen in both study periods. There was no significant difference in the clinical course between immunised and non-immunised children admitted with RVGE. CONCLUSION: The introduction of the RVV to the NIP significantly reduced the admissions due to both AGE and RVGE in children <5 years. However, RV is still the most common agent for admissions due to AGE in this age group.

Maternal presentation and neonatal outcome in peripartum enterovirus infection.

AIM: Enterovirus is a common pathogen. Although mostly asymptomatic, this infection has the potential to be life-threatening in neonates. This article aims to describe the early neonatal outcomes in peripartum infection. METHODS: We performed a retrospective cohort study in a tertiary hospital between 1/2014 and 5/2019. The enterovirus infection was established by real-time polymerase chain reaction analysis. RESULTS: Out of 161 neonates tested for the enterovirus infection 13 (8%) were positive. Maternal fever was the most common sign (n = 8, 66.7%). The mean gestational age at delivery was 36 + 5 (range 30 + 5 to 40 + 6 weeks). The mean time interval from birth to neonatal manifestations of infection was 5.2 (0-9) days. The most common presenting sign in the neonates was fever (n = 8, 61.5%). All neonates required the neonatal intensive care unit. The neonatal mortality rate was 3/13 (23%). CONCLUSION: The neonatal morbidity and mortality from the enterovirus infection may have been associated with the severity of maternal presentation at the time of admission. Enterovirus real-time polymerase chain reaction analysis should be considered as part of the maternal evaluation in cases of maternal fever of unknown origin. Deferral of the induction of delivery for term pregnancies with confirmed enterovirus infections should be considered.

Assessment of Risk Indicators for Targeted Cytomegalovirus Screening in Neonates.

BACKGROUND: In the absence of universal screening for congenital cytomegalovirus (cCMV) infection, the aim of this study was to assess the outcomes of a targeted screening protocol based on maternal and neonatal risk indicators. METHODS: The medical records of 2,623 neonates born in our maternal hospital between June 2016 and December 2018 and screened for cCMV infection were reviewed. Among those of the included neonates, the records of 380 CMV-negative and 19 CMV-positive neonates were randomly assigned to obtain additional comparative data. RESULTS: During the study period, a total of 63 neonates were identified as positive for cCMV, comprising 0.2% of the total birth cohort (63/28,982) and 2.4% of all neonates screened for cCMV (63/2,623). The comparative data analysis showed that suspected or confirmed CMV infection during pregnancy, maternal age, and maternal diabetes mellitus were found to be significantly associated with a positive cCMV diagnosis. Although symmetric small for gestational age and hearing screening failure contributed to the detection of some of the CMV-positive infants, these factors were not specific to this group. The results of the logistic regression model showed that the only factor that was significantly associated with an increased risk for a cCMV diagnosis was maternal serology suspected of CMV infection during pregnancy, with a regression coefficient estimate of 2.657 (adjusted p < 0.001). CONCLUSIONS: A targeted neonatal screening protocol based on multiple maternal and neonatal risk indicators is feasible but provides limited information. Our study emphasizes the importance of universal neonatal screening for the detection of neonates with cCMV.

Chronic schistosomiasis in African immigrants in Israel: Lessons for the non-endemic setting.

To study the clinical presentation of Chronic Schistosomiasis (CS) in immigrants from East Africa to Israel and the tests that were useful in confirming the diagnosis.A retrospective study of all medical notes pertaining to hospitalized patients who were immigrants from East Africa with a pathological or microscopic confirmation of CS. Literature review was also conducted focusing on diagnosis of schistosomiasis among immigrants from endemic countries.We identified 32 suspected and 11 confirmed cases of CS. Most of the patients (82%) presented with gastrointestinal symptoms. Sensitivity of stool smear, serology and tissue diagnosis (by histopathology or microscopy) were 14%, 100%, 89%, respectively. Patients have undergone extensive diagnostic evaluation with long hospitalization stays (median 10 days, range 4 to 33 days).CS has multiple presentations and is seen in Israel among refugees from Eritrea and Sudan. Most of the manifestations are gastrointestinal, suggestive of infection with Schistosoma mansoni (S. mansoni). Standard diagnostic techniques used in endemic countries, such as microscopy for ova and parasites were unhelpful, necessitating more advanced procedures like colonoscopic or liver biopsy. We propose a diagnostic algorithm for CS in this patient population in order to make an accurate diagnosis and avoid unnecessary invasive procedures.

Characterization of hepatitis B and delta coinfection in Israel.

BACKGROUND: Characteristics of hepatitis B (HBV) and delta (HDV) coinfection in various geographical regions, including Israel, remain unclear. Here we studied HDV seroprevalence in Israel, assessed HDV/HBV viral loads, circulating genotypes and hepatitis delta antigen (HDAg) conservation. METHODS: Serological anti HDV IgG results from 8969 HBsAg positive individuals tested in 2010-2015 were retrospectively analyzed to determine HDV seroprevalence. In a cohort of HBV/HDV coinfected (n=58) and HBV monoinfected (n=27) patients, quantitative real-time PCR (qRT-PCR) and sequencing were performed to determine viral loads, genotypes and hepatitis delta antigen (HDAg) protein sequence. RESULTS: 6.5% (587/8969) of the HBsAg positive patients were positive for anti HDV antibodies. HDV viral load was >2 log copies/ml higher than HBV viral load in most of the coinfected patients with detectable HDV RNA (86%, 50/58). HDV genotype 1 was identified in all patients, most of whom did not express HBV. While 66.6% (4/6) of the HBV/HDV co-expressing patients carried HBV-D2 only 18.5% (5/27) of the HBV monoinfections had HBV-D2 (p=0.03). Higher genetic variability in the HDAg protein sequence was associated with higher HDV viral load. CONCLUSIONS: The overall significant prevalence of HDV (6.5%) mandates HDV RNA testing for all coinfected patients. Patients positive for HDV RNA (characterized by low HBV DNA blood levels) carried HDV genotype 1. Taken together, the significant HDV seroprevalence and the lack of effective anti-HDV therapy, necessitates strict clinical surveillance especially in patients with higher HDV viral loads and increased viral evolution.

An outbreak of dengue virus (DENV) type 2 Cosmopolitan genotype in Israeli travellers returning from the Seychelles, April 2017.

Dengue virus infection was diagnosed in six Israeli travellers returning from the Seychelles in April 2017. Phylogenetic analysis identified identical sequences belonging to the Cosmopolitan genotype of dengue virus type 2 in all samples sequenced, thus providing evidence for a probable dengue type 2 outbreak in the Seychelles. This report further demonstrates the role of travellers as sentinels for arboviral infections, especially in countries with limited diagnostic capabilities.