Changes in COVID-19 measures in the workplace: 8-month follow-up in a cohort study of full-time employees in Japan.

While the preventive measures responding to COVID-19 in the workplace were well-implemented during the earlier phase of the outbreak, they seem to have been relaxed after a huge outbreak (T3 to T4: August to November 2020). Workplaces should be encouraged to continue the preventive measures over repeated outbreaks.