Worried callers are swamping phone lines at health centers near the school and homes of two Tokyo-area high school students confirmed to have swine flu.
This is the first time, apart from four cases at Narita airport earlier this month, that the new H1N1 virus has been found in residents in the Tokyo area.
In Hachioji, Tokyo, where one of the teens lives, the city health center was getting nearly triple the normal number of calls. It received 440 calls by Thursday afternoon, whereas the usual daily count is around 150.