Bias in Reporting Location of New Coronavirus Cluster Outbreaks

ABSTRACT

Infections caused by the novel coronavirus disease (COVID-19] increase significantly due to the occurrence of clusters. A COVID-19 cluster refers to the simultaneous occurrence of multiple infections, caused by the same agent, in a specific group. Japan has reported several COVID-19 cases in its welfare and nursing care facilities. However, to the best of our knowledge, the occurrence of clusters has not been observed yet in public transportation, where they are likely to occur more frequently. This study aims to examine the reasons why COVID-19 clusters occur in some places and do not in others.