Covid: How Delays in Second Dose Administration May Compromise Immunization Efforts

  • By Pablo Uchoa
  • BBC World Service

Photo credit, Reuters

Image caption,

Most of the available Covid-19 vaccines require two doses to be effective

Most of the available Covid-19 vaccines, including those from AstraZeneca, Pfizer and Sputnik, require people to receive two doses, spaced over a period of time, to be fully effective.

But as countries around the world rush to immunize their populations, this added level of complexity proves problematic.

Supply issues, logistical challenges and social issues prevent a significant number of people from receiving their second dose at the right time.

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