children under the age of five, which are at their highest level since the start of the pandemic. meanwhile, several states are hitting new records, including florida, where cases are up 56% in the last seven days and where there s a big testing snafu. here s cbs manuel bojorquez. reporter: today, after much criticism, the c.d.c. tried to clarify its guidance for those who test positive for covid but no longer have symptoms, saying if they want to use a rapid test to determine whether to leave isolation after five days, it would be the best approach. if it s positive, stay home. and if it s negative, please continue to wear your mask, because that does not mean you re no longer infectious. reporter: as the c.d.c. encourages people to get boosted when they re eligible, the f.d.a. shortened the time between a second moderna shot and a booster to five months like it had for pfizer s. moderna s c.e.o. said a fourth dose may be needed in the fall, but west virginia is asking the c.d.