Scientists on alert as new Covid strain tears through ’multiple countries’
https://www.news.com.au/world/scientists-on-alert-as-new-covid-strain-tears-through-multiple-countries/news-story/d7975efbc4350976900a6ea0c834d9be

アメリカではBF.7(BA.5.2.1.7)なる変異株が拡大中
感染力は親株のBA.5より強い可能性あり