Restricted accessResearch articleFirst published online 2022-3
Effectiveness of Infection Preventive Behaviors on COVID-19-Like Illness Symptoms During the Winter Third Wave of the Epidemic in Japan: A 2-Month Follow-up Nationwide Cohort Study
Although multilayered strategies including preventive behaviors should be adopted to mitigate coronavirus disease 2019 (COVID-19) transmission, evidence on the effectiveness of preventive behaviors against COVID-19 remains limited. This Internet-based prospective cohort study collected baseline data in November 2020 and follow-up data in February 2021, during the third wave of the epidemic in Japan. Among the 19 941 included participants, the percentages reporting that they always used a face mask, practiced hand washing/disinfection, gargling, and ensuring proper room ventilation were 85.4%, 36.0%, 51.1%, and 44.6%, respectively. Multiple logistic regression analyses revealed that less frequently practicing hand washing/disinfection (odds ratio [OR] = 1.20), gargling (OR = 1.20), and ensuring proper room ventilation (OR = 1.38) were significantly associated with self-reported COVID-19-like illness (CLI). These results suggest that personal preventive behaviors may be effective in reducing CLI, even when universal masking is practiced.
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