A department spokeswoman says officials also should find out in the next day or two whether a more advanced test can confirm swine flu in a Philadelphia boy whose case was announced a day ago.
The 2-year-old boy's test results from a federal Centers For Disease Control and Prevention laboratory should be available in 24 to 48 hours.
The department says the three new cases involve a 46-year-old woman and a 25-year-old man from Philadelphia and a 31-year-old man from Montgomery County.
RELATED INFORMATION:
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Transcript of 6abc.com's swine flu chat with local experts
RELATED LINKS:
CDC Swine Flu site
World Health Organization
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