You may be right that revising the definitions would result in an increased new case count. But it is possible that many of those in the increased count also got infected by the original case in the group. Family and Friends. A bar on Memorial Day Weekend.

Edit: the revised definitions are actually CV19 symptoms. So that headache could be a headache or one of a number of CV19 symptoms. They do have to see symptoms to count the new case into the system.

Scientists are saying that the CV19 is also mutating into a more contagious virus.
That means where one case might infect a few people, the newer mutation might increase a few more, which is really a lot and also explains the increase.