Health Department spokeswoman Jessica Scaperotti confirmed the investigation but said the agency does not discuss specific cases. It's not yet known how long the investigation will take.
On Sunday, a public school assistant principal, Mitchell Wiener, became the city's first swine flu death.
Hospital and city officials say complications besides the virus probably played a part in Wiener's death. But his family has said he suffered only from gout, a joint disease.
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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