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  1. 10 Common Winter Illnesses - Cleveland Clinic Health Essentials

  2. Winter Illness Guide - Johns Hopkins Medicine

  3. Winter viruses - NIH MedlinePlus Magazine

  4. Mayo Clinic Minute: Why do people get sick with viruses in the winter?

  5. Seasonal Infections: Types and Ways to Prevent Them - HealthNews

  6. Health Care Provider Resources | Respiratory Illnesses | CDC

  7. Do You Have the Flu, RSV, COVID, or a Cold? - WebMD

  8. Why You're More Likely to Get Sick in the Winter | TIME

  9. Medics fear surge in winter viruses alongside Covid - BBC