noun
mega cluster; very large cluster (of a virus); large concentrated outbreak
Wasei-eigo term used especially in epidemiological contexts to describe a large cluster of infections or a major outbreak. Often used in news reports about COVID-19 and similar diseases.
wasei-eigo (Japanese-coined English), from mega cluster
この地域でメガクラスターが発生し、感染者が急増した。
A mega cluster occurred in this area, causing a sharp rise in infections.
専門家はメガクラスターの拡大を防ぐため、早急な対策が必要だと述べた。
Experts said that urgent measures are needed to prevent the mega cluster from spreading.