Officials say more cases are being confirmed due to stepped-up testing, and there's no cause for alarm.
The earlier unrelated cases were two Montgomery County men who have recovered.
The Pennsylvania Department of Health on Friday was reporting 18 "probable" cases of swine flu in 10 counties: Adams, Cambria, Chester, Franklin, Lehigh, Mercer, Montgomery, Philadelphia, Westmoreland and York.
RELATED INFORMATION:
FAQs about swine flu
Additional swine flu resources
Transcript of 6abc.com's swine flu chat with local experts
RELATED LINKS:
CDC Swine Flu site
World Health Organization
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Swine flu cases around the world
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