ArticleClinical infectious diseases : an official publication of the Infectious Diseases Society of America2025
SARS-CoV-2 Seroprevalence, Illness Recall, and Work Absenteeism Among Healthcare Workers: A Facility-Based Cross-Sectional Study in the Philippines, 2021.
Article in Clinical infectious diseases : an official publication of the Infectious Diseases Society of America, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundHealthcare workers (HCWs) have been disproportionately affected by coronavirus disease 2019 (COVID-19). This study assessed HCW severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) seroprevalence trends and indicators' effectiveness for infection monitoring in the Philippine healthcare setting during 2021 and 2022-2023.
methodsWe obtained data on HCW demographics at 2 facilities, and COVID-19 symptoms recall and absenteeism at one facility. We collected and tested blood specimens with a SARS-CoV-2 spike and nucleocapsid protein-based serological assay. We calculated crude prevalence ratios (PRs) and 95% confidence intervals (CIs) for risk factors.
resultsA total of 253 HCWs were included. Seroprevalence of SARS-CoV-2 infection among HCWs was 34% from September to October 2021 and 92% from October 2022 to April 2023 during the Delta and the Omicron variant surges, respectively, at one facility. At the other facility, seroprevalence was 31% in September-October 2021. Of the 33 seropositive HCWs with questionnaire completed, 14 (42%) did not recall COVID-19-like symptoms in the past year. Serological evidence of SARS-CoV-2 infection was statistically more likely among HCWs who recalled COVID-19-like symptoms in the past year (PR, 2.69 [95% CI: 1.53-4.72]; P < .05). Of the seropositive HCWs, 7 (21%) had no hospital documentation of missed work. Of the 24 HCWs with a positive SARS-CoV-2 test, 12 (50%) tested because of symptoms, 4 (17%) tested after exposure, and 5 (21%) tested following employment screening.
conclusionsSelf-reported symptoms may be used to track SARS-CoV-2 prior infections within resource-limited healthcare settings. Occupational health services should consider these findings when developing infection monitoring strategies among HCWs. Combining surveillance strategies may strengthen infection monitoring.
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