Since they both got sick at the same time, officials believe the patient and the contact were exposed together to some unknown animal or animal product - ruling out spread of the virus from one of them to the other, Daskalakis said.
Bird flu not evidenced to be spreading between people in Missouri after health officials investigate
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Daskalakis said all should offer good cross protection to other subtypes now spreading.
It's time to roll up sleeves for new COVID-19, flu shots
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