In this article, the CDC admits that each positive case is counted as a new case, even if it is the same person has tested positive more than once:
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwjhja34183qAhVJHjQIHa6SCwMQFjABegQIAhAB&url=https%3A%2F%2Fwww.cdc.gov%2Fcoronavirus%2F2019-ncov%2Fcases-updates%2Ftesting-in-us.html&usg=AOvVaw1hB7bmVX44xMDxZCnLWG39
thanks