Stanley's illness was disclosed earlier this week and Simmons' was disclosed on Wednesday.
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Simmons is said to be experiencing "mild symptoms," according to a statement from the band.
The tour is expected to resume on Sept. 9 in Irvine, California. The band and crew will be isolating for the next 10 days out of precaution, the statement added.
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The postponed dates include shows that were set to take place in Michigan, Ohio, Illinois and Wisconsin.
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The band previously postponed a show in Burgettstown, Pennsylvania after news of Stanley's positive test was disclosed.
The band, via a previous statement, had said that both the band and the crew on tour were fully vaccinated and "operated in a bubble" independently to safeguard everyone as much as possible between shows.
Stanley has since said on social media that he's recovered after experiencing symptoms that were "mild compared to many others."
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