The Tokyo metropolitan government raised its COVID-19 alert to the highest of four levels Thursday amid a resurgence of coronavirus infections.The decision was made after the highly-transmissible BA.5 Omicron subvariant saw Japan enter its seventh wave of infections.Related coverage:Japan unlikely to ask people to curb activities despite COVID spikeJapan's new COVID-19 cases top 90,000, 1st time in 5 monthsJapan logs most COVID cases since March, delays domestic travel plan
