Cases of influenza in the United States are rising, driven by a new strain that public health officials worry current vaccines may not protect against as effectively. Health officials and researchers say that although the flu season has not reached its peak, the spike in cases is not historically unusual - and they stress vaccines probably still offer protection against the worst effects of the strain.Subscribe to The Post Most newsletter for the most important and interesting stories from The W

Wastewater testing can alert public health officials to measles infections days to months before cases are confirmed by doctors, researchers said in two studies published Thursday by the Centers for Disease Control and Prevention. Colorado health officials were able to get ahead of the highly contagious virus by tracking its presence in sewer systems, researchers wrote. The findings add to evidence that wastewater testing is a valuable weapon in tracking disease, including COVID-19, polio, mpo

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