Near-source passive sampling for monitoring viral outbreaks within a university residential setting.

Wastewater-based epidemiology (WBE) has proven to be a powerful tool for the population-level monitoring of pathogens, particularly severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). For assessment, several wastewater sampling regimes and methods of viral concentration have been investigated, mainly targeting SARS-CoV-2. However, the use of passive samplers in near-source environments for a range of viruses in wastewater is still under-investigated. To address this, near-source passive samples were taken at four locations targeting student hall of residence. These were chosen as an exemplar due to their high population density and perceived risk of disease transmission. Viruses investigated were SARS-CoV-2 and its variants of concern (VOCs), influenza viruses, and enteroviruses. Sampling was conducted either in the morning, where passive samplers were in place overnight (17 h) and during the day, with exposure of 7 h. We demonstrated the usefulness of near-source passive sampling for the detection of VOCs using quantitative polymerase chain reaction (qPCR) and next-generation sequencing (NGS). Furthermore, several outbreaks of influenza A and sporadic outbreaks of enteroviruses (some associated with enterovirus D68 and coxsackieviruses) were identified among the resident student population, providing evidence of the usefulness of near-source, in-sewer sampling for monitoring the health of high population density communities.

Incidence of Clostridioides difficile infection (CDI) related to antibiotic prescribing by GP surgeries in Wales.

BACKGROUND: Clostridioides difficile infection (CDI) is a healthcare-acquired infection (HAI) causing significant morbidity and mortality. Welsh CDI rates are high in comparison with those in England and Scotland. OBJECTIVES: This retrospective ecological study used aggregated disease surveillance data to understand the impact of total and high-risk Welsh GP antibiotic prescribing on total and stratified inpatient/non-inpatient CDI incidence. METHODS: All cases of confirmed CDI, during the financial years 2014-15 to 2017-18, were linked to aggregated rates of antibiotic prescribing in their GP surgery and classified as 'inpatient', 'non-inpatient' or 'unknown' by Public Health Wales. Multivariable negative-binomial regression models, comparing CDI incidence with antibiotic prescribing rates, were adjusted for potential confounders: location; age; social deprivation; comorbidities (estimated from prevalence of key health indicators) and proton pump inhibitor (PPI) prescription rates. RESULTS: There were 4613 confirmed CDI cases, with an incidence (95% CI) of 1.44 (1.40-1.48) per 1000 registered patients. Unadjusted analysis showed that an increased risk of total CDI incidence was associated with higher total antibiotic prescribing [relative risk (RR) (95% CI) = 1.338 (1.170-1.529) per 1000 items per 1000 specific therapeutic group age-sex related GP prescribing units (STAR-PU)] and that high-risk antibiotic classes were positively associated with total CDI incidence. Location, age ≥65 years and diabetes were associated with increased risk of CDI. After adjusting for confounders, prescribing of clindamycin showed a positive association with total CDI incidence [RR (95% CI) = 1.079 (1.001-1.162) log items per 1000 registered patients]. CONCLUSIONS: An increased risk of CDI is demonstrated at a primary care practice population level, reflecting their antibiotic prescribing rates, particularly clindamycin, and population demographics.

Epidemiological analysis of the first 1000 cases of SARS-CoV-2 lineage BA.1 (B.1.1.529, Omicron) compared with co-circulating Delta in Wales, UK.

BACKGROUND: The Omicron (lineage B.1.1.529) variant of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) was first reported in Wales, UK, on 3 December 2021. The aim of the study was to describe the first 1000 cases of the Omicron variant by demographic, vaccination status, travel and severe outcome status and compare this to contemporaneous cases of the Delta variant. METHODS: Testing, typing and contact tracing data were collected by Public Health Wales and analysis undertaken by the Communicable Disease Surveillance Centre (CDSC). Risk ratios for demographic factors and symptoms were calculated comparing Omicron cases to Delta cases identified over the same time period. RESULTS: By 14 December 2021, 1000 cases of the Omicron variant had been identified in Wales. Of the first 1000, just 3% of cases had a prior history of travel revealing rapid community transmission. A higher proportion of Omicron cases were identified in individuals aged 20-39, and most cases were double vaccinated (65.9%) or boosted (15.7%). Age-adjusted analysis also revealed that Omicron cases were less likely to be hospitalised (0.4%) or report symptoms (60.8%). Specifically a significant reduction was observed in the proportion of Omicron cases reporting anosmia (8.9%). CONCLUSION: Key findings include a lower risk of anosmia and a reduced risk of hospitalisation in the first 1000 Omicron cases compared with co-circulating Delta cases. We also identify that existing measures for travel restrictions to control importations of new variants identified outside the United Kingdom did not prevent the rapid ingress of Omicron within Wales.

Risk factors for postoperative hemorrhage following tonsillectomy.

OBJECTIVES/HYPOTHESIS: To identify the main risk factors associated with postoperative hemorrhage following tonsillectomy. STUDY DESIGN: Prospective multicenter observational study. METHODS: The Surgical Instrument Surveillance Programme (SISP) was established in 2003 to monitor tonsil and adenoid surgery and the associated complications in all hospitals in Wales. Data were examined between April 1, 2003, and June 30, 2008, by using binary logistic regression, for risk factors that may contribute to primary (R1) or secondary (R2) postoperative hemorrhage of a severity sufficient to require a return to the operating theater. RESULTS: A total of 17,480 procedures were included. Patients aged ≥12 years were 1.5 (1.0-2.1; P < .05) and 3 times (2.2-4.9; P < .0001) more likely to experience R1 and R2 complications, respectively. There were 2.5 times as many females as males aged ≥12 years who underwent tonsillectomy, but males were almost twice as likely to experience R1 (1.4-2.8), P < .0001, or R2 (1.2-2.5), P < .001, postoperative hemorrhage. There was a 1.9-fold increased likelihood of R1 (1.1-3.3), P < .05, with the most junior surgeon, and no relationship with R2. All techniques that used heat had a significantly greater adjusted odds of R2 as compared with cold dissection, with odds ranging from 2.7 (1.5-4.7), P < .001, for dissection plus bipolar diathermy and ties, to 13.0 (5.8-29.1), P < .0001, with coblation when used with other techniques. No additional risk was associated with specified single-use instruments. CONCLUSIONS: Patient age and sex and operative technique were the most significant factors affecting the risk and timing of serious postoperative hemorrhage, with no additional risk associated with the use of specified single-use instruments.