COVID-19 vaccine development part 16


Why there are so many COVID-19 vaccines in development :

  • There are many different COVID-19 vaccines in development because it is not yet known which ones will be effective and safe
  • Based on experience, roughly 7% of vaccines in preclinical studies succed. Candidates that reach clinical trials have about a 20% chance of succeeding
  • Different vaccine types may be needed for different population groups
  • For example, some vaccines may work in older persons and some may not, as the immune system weakens with older age

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