
Wednesday's death toll was 354. Scientists are investigating what's making cases of infection rise precipitously after a decline last fall. "This race is really against time," says one immunologist.
(Image credit: Rajanish Kakade/AP)

Wednesday's death toll was 354. Scientists are investigating what's making cases of infection rise precipitously after a decline last fall. "This race is really against time," says one immunologist.
(Image credit: Rajanish Kakade/AP)
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