What to know about 'quad-demic' of COVID, flu, RSV and norovirus in US The U.S. is seeing a "quad-demic" as cases of COVID-19, flu, RSV and norovirus spread at the same time. Experts said this is what you need to know. ABC News ABC News

Four viruses are currently circulating in the United States, which some have referred to as a "quad-demic."

1 in 20 COVID survivors may have condition characterized by extreme fatigue The percentage of all participants who had ME/CFS post-infection was 4.5%, compared with 0.6% of controls. Post-exertional malaise was the most common symptom in both acute-infected (15.9%) and post-acute–infected participants (29.1%), followed by positional dizziness (14.4% and 25.0%, respectively).  CIDRAP

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US respiratory disease markers remain high for flu, COVID, RSV Respiratory virus activity across the nation remains high, with COVID-19 levels rising across much of the country, flu indicators still elevated, and respiratory syncytial virus (RSV) activity very high in many regions, the US Centers for Disease Control and Prevention (CDC) said in its latest illness updates. CIDRAP

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Forty-three states are reporting very high or high flu activity, and of respiratory samples that tested positive for flu at public health labs, nearly 98% were influenza A. Of subtyped samples, 55.5% were H3N2, and 44.5% were 2009 H1N1.

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