It usually takes 5-20 years to develop a vaccine, but researchers are racing to develop one for COVID-19 within a much shorter timeframe due to the seriousness of the pandemic. To win this race, researchers must develop a vaccine that does not cause additional health problems, that provides long-term protection to prevent re-emergence of the virus in years to come, and that protects older people who may mount a weaker immune response.
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The pandemic vaccine development timeline
Four approaches that scientists are using to develop COVID-19 vaccines
