A high percentage of respondents said they were aware of the tick-borne disease and spent time outdoors, but less than half said they took measures to prevent infection.
Adjusted effectiveness against emergency department visits/hospitalizations was 95% among patients aged 75 and older.
The total represents the most US infections since 1992.
Infectious disease information from CIDRAP.
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Data on novel vaccine candidates in clinical or late preclinical development.
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