The flu season in Japan has continued into May, with experts attributing the prolonged spread of infections to low herd immunity and government relaxation of coronavirus measures.
Concerns over the rapid spread of the omicron variant have continued to grow, with the prime minister requesting that people take preventative measures during the holiday season.
Experts have expressed concerns that flu viruses may spread globally if international travel resumes and that a sixth wave of COVID-19 and a flu outbreak may occur at the same time.