COVID-19 among workers of a comprehensive cancer centre between first and second epidemic waves (2020): a seroprevalence study in Catalonia, Spain.

OBJECTIVES: Patients with cancer are at higher risk for severe COVID-19 infection. COVID-19 surveillance of workers in oncological centres is crucial to assess infection burden and prevent transmission. We estimate the SARS-CoV-2 seroprevalence among healthcare workers (HCWs) of a comprehensive cancer centre in Catalonia, Spain, and analyse its association with sociodemographic characteristics, exposure factors and behaviours. DESIGN: Cross-sectional study (21 May 2020-26 June 2020). SETTING: A comprehensive cancer centre (Institut Català d'Oncologia) in Catalonia, Spain. PARTICIPANTS: All HCWs (N=1969) were invited to complete an online self-administered epidemiological survey and provide a blood sample for SARS-CoV-2 antibodies detection. PRIMARY OUTCOME MEASURE: Prevalence (%) and 95% CIs of seropositivity together with adjusted prevalence ratios (aPR) and 95% CI were estimated. RESULTS: A total of 1266 HCWs filled the survey (participation rate: 64.0%) and 1238 underwent serological testing (97.8%). The median age was 43.7 years (p25-p75: 34.8-51.0 years), 76.0% were female, 52.0% were nursing or medical staff and 79.0% worked on-site during the pandemic period. SARS-CoV-2 seroprevalence was 8.9% (95% CI 7.44% to 10.63%), with no differences by age and sex. No significant differences in terms of seroprevalence were observed between onsite workers and teleworkers. Seropositivity was associated with living with a person with COVID-19 (aPR 3.86, 95% CI 2.49 to 5.98). Among on-site workers, seropositive participants were twofold more likely to be nursing or medical staff. Nursing and medical staff working in a COVID-19 area showed a higher seroprevalence than other staff (aPR 2.45, 95% CI 1.08 to 5.52). CONCLUSIONS: At the end of the first wave of the pandemic in Spain, SARS-CoV-2 seroprevalence among Institut Català d'Oncologia HCW was lower than the reported in other Spanish hospitals. The main risk factors were sharing household with infected people and contact with COVID-19 patients and colleagues. Strengthening preventive measures and health education among HCW is fundamental.

Fiber burden and asbestos-related diseases: an umbrella review.

OBJECTIVE: What are the levels of asbestos exposure that cause each type of health effect? The objective of this study was to review the available scientific evidence on exposure levels for asbestos and their relationship to health effects. METHOD: An umbrella review of English-language reviews and meta-analyses, from 1980 to March 2021 was conducted. We included reviews involving quantified asbestos exposures and health outcomes. The review has been adapted to the indications of the PRISMA declaration. Methodological quality of the selected studies was assessed using the AMSTAR instrument. RESULTS: We retrieved 196 references. After applying the search strategy and quality analysis, 10 reviews were selected for in-depth analysis. For lung cancer, the highest risk was observed with exposure to amphiboles. Longer, thinner fibers had the greatest capacity to cause lung cancer, especially those > 10 µm in length. For mesothelioma, longer and thinner fibers were also more pathogenic; amphiboles ≥ 5 µm are especially associated with increased mesothelioma risk. No studies observed an increased risk for lung cancer or mesothelioma at asbestos exposure levels <0.1 f/ml. No reviews provided information on exposure concentrations for pulmonary fibrosis. Currently, there is limited evidence in humans to establish the causal relationship between gastrointestinal cancer and asbestos exposure. CONCLUSIONS: Banning all asbestos exposure remains the best measure to preventing its negative health effects. The highest quality reviews and meta-analyses support that there is little risk of lung cancer or mesothelioma at daily exposure levels below 0.1 f/ml.

Adoption of preventive measures after returning to work among workers affected by De Quervain's tenosynovitis.

OBJECTIVES: To determine whether if there was any increase in preventive measures adopted following reincorporation to their jobs among workers affected by De Quervain's tenosynovitis (DQT), who were treated by surgical intervention. METHODS: Study subjects where those workers, members of a mutual health insurance scheme, who were operated on between June 2006 and June 2009 (n=52). For each worker we checked whether preventive measures had been taken in their workplace, both before their episode, and following reincorporation. The difference in proportions (DP) was calculated between the proportion of individuals with preventive measures after reincorporation and the proportion with preventive measures implemented prior to their surgical intervention, both globally and in terms of sociodemographic, occupational, and clinical variables. RESULTS: The proportion of workers with preventive measures adopted following reincorporation to their job was higher than the proportion with preventive measures prior to their surgical intervention (DP = 23.1 %; 95 %CI: 6.4-39.7 %). The risk factors associated with the greatest change in preventive measures were repetitive movements (DP = 25.6 %; 95 %CI: 6.1-45.1 %) and awkward postures (DP = 40 %; 95 %CI: -22.9 to 100 %). CONCLUSIONS: Despite the increased proportion of workers with preventive measures implemented in their workplace following reincorporation to the job, there is a lack of information and of adoption of ergonomic preventive measures specific to this pathology. Implementation of ergonomic programs could reduce incidence of musculoskeletal disorders such as DQT, and would thus increase productivity, efficiency and worker satisfaction, while diminishing sick leave episodes, and the associated costs and relapses.