Stanley’s illness was announced earlier this week and Simmons’s on Wednesday.
Simmons is said to have “mild symptoms,” according to a statement from the band.
The tour is expected to resume on September 9 in Irvine, California. The band and crew will be in isolation for the next 10 days as a precaution, the statement said.
The postponed dates include shows scheduled to take place in Michigan, Ohio, Illinois and Wisconsin.
The band had previously postponed a show in Burgettstown, Pennsylvania after news of Stanley’s positive test was announced.