Covid-19 Vaccine Efficacy: Nurse in California Contracts Virus After Receiving Pfizer Shot

Strategic Insights -

A California nurse has tested positive for Covid-19 nearly a week after receiving Pfizer Inc's vaccine, underscoring the complex and evolving nature of vaccine efficacy. Matthew W, a 45-year-old nurse who works at two hospitals, received the Pfizer vaccine and fell ill six days later, despite experiencing only mild side effects. This scenario is not unexpected, according to infectious disease specialist Christian Ramers, who notes that it may take 10-14 days for the vaccine to develop protection. The Pfizer-BioNTech vaccine has been authorized for emergency use by the FDA, but it has not been approved or licensed.

Key Takeaways:

  • A nurse in California tested positive for Covid-19 nearly a week after receiving the Pfizer vaccine, despite experiencing only mild side effects.
  • The vaccine is not immediately effective, and it may take 10-14 days for it to develop protection, according to infectious disease specialist Christian Ramers.
  • Pfizer states that the emergency use of its vaccine is only authorized for the duration of the declaration that circumstances exist justifying the authorization of emergency use of the medical product under Section 564(b)(1) of the FD&C Act.
  • The vaccination process typically involves two doses, with the second dose providing up to 95% protection.
  • Pfizer will review all available information on this case and all reports of any confirmed diagnosis following vaccination.

Statistics:

  • 50%: The estimated protection provided by the first dose of the Pfizer vaccine.
  • 95%: The estimated protection provided by the second dose of the Pfizer vaccine.
  • 10-14 days: The timeframe for the vaccine to develop protection, according to infectious disease specialist Christian Ramers.
  • 16 years of age: The minimum age requirement for the Pfizer-BioNTech Covid-19 vaccine to be used under Emergency Use Authorisation (EUA).
  • Section 564(b)(1) of the FD&C Act: The provision under which the Pfizer-BioNTech Covid-19 vaccine has been authorized for emergency use.

Sources:

  • ABC News affiliate report
  • Pfizer-BioNTech Covid-19 vaccine website statement
  • Christian Ramers, infectious disease specialist with Family Health Centers of San Diego