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Polio, monkeypox, marburg virus, and other infectious diseases are surging around the globe.
Experts say there's not one thing driving the surge — a multi-layered perfect storm has been brewing for some time.
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In 2020, Covid reinfections were considered rare.
BA.5 causes concern because of its increased contagiousness and because of its greater ability to evade the protection from vaccines and prior infection.
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