Pandemics in history — and today
A look back at past pandemics.
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Complications of COVID-19
This virus can be quite dangerous.
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What else could it be?
Sometimes respiratory symptoms are due to something other than a cold, COVID-19, or flu.
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Zoonotic infections
Some viruses start in animals and then spread to humans.
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COVID-19, flu, and cold symptoms: how to tell the difference.
Spot key distinctions with this guide.
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What are the differences in symptoms between colds, flu and COVID?
These illnesses cause similar symptoms, but with some key differences.
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How are COVID-19, flu, and colds different?
They’re all caused by viruses, but they vary in how they affect your body.
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Who’s at risk for severe COVID-19?
Age, weight, and underlying conditions all play a role.
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The stomach “flu”
It’s not the same virus that causes influenza.
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High blood pressure or heart disease? Choose your cold medicine carefully.
Decongestants found in cold medicines can raise blood pressure.
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