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2. H1N1 Influenza vs. COVID-19: Pandemic Comparison - Healthline

   www.healthline.com/health/h1n1-vs-covid-19

   COVID-19 is more contagious than 2009 H1N1 influenza. This means that COVID-19 can spread more easily between individuals. It’s estimated that the R 0 for COVID-19 is about 3 while the R 0 for ...

3. Key Differences Between Flu vs. COVID vs. RSV - Healthline

   www.healthline.com/health/flu-covid-rsv-comparison

   For most people, the flu may last from a few days to 2 weeks, COVID-19 may last between 1 and 14 days, and RSV symptoms can last between 1 and 2 weeks. Some individuals are at higher risk from ...

4. Coronavirus vs. Flu: Symptom Differences, More - Healthline

   www.healthline.com/health/coronavirus-vs-flu

   COVID-19, caused by the novel coronavirus, and the flu are both respiratory illnesses. While there’s a lot of overlap between them, there are also key differences in the symptoms, incubation ...

5. H1N1 Flu Virus (Swine Flu): Symptoms, Causes, Tests, and ...

   www.webmd.com/cold-and-flu/h1n1-flu-virus-swine-flu

   Fever. Sore throat. Stuffy or runny nose. Body aches. Headache. Chills. Fatigue. Like the regular flu, swine flu can lead to more serious problems including pneumonia, a lung infection, and other ...

6. Pandemics: Definition, Prevention, and Preparation - WebMD

   www.webmd.com/cold-and-flu/what-are-epidemics...

   Phase 1: A virus in animals has caused no known infections in humans. Phase 2: An animal virus has caused infection in humans. Phase 3: There are scattered cases or small clusters of disease in ...

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

   www.webmd.com/cold-and-flu/news/20231122/do-you...

   Common cold symptoms tend to come on fairly quickly, explained Chin-Hong. If you get RSV, on the other hand, it may take 4 to 6 days before symptoms show. Flu viruses are a totally different story ...

8. The Worst Outbreaks in U.S. History - Healthline

   www.healthline.com/health/worst-disease...

   This outbreak made headlines as the swine flu. The CDC estimates that there were 60.8 million cases, 274,304 hospitalizations, ... H1N1 Influenza vs. COVID-19: Pandemic Comparison.

9. Is It a Cold or the Flu? - WebMD

   www.webmd.com/cold-and-flu/ss/slideshow-cold-or-flu

   If you feel like you've been hit by a truck, it's probably the flu. Symptoms like sore throat, fever, headache, muscle aches, congestion, and cough tend to come on suddenly. Colds are usually less ...