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Covishield : Interval Between Doses

Covishield:

The government has decided to increase the interval between the first and second doses of Covishield to up to eight weeks in its ongoing vaccination drive against Covid-19.

  • Covishield is Serum Institute of India’s version of AZD1222, the vaccine developed by AstraZeneca in collaboration with the University of Oxford.
  • Some data from global trials of AZD122 suggests that extending the duration between doses to 12 weeks increased its efficacy much more.
  • The Ministry of Health and Family Welfare took the decision on the recommendation of two expert groups – the National Technical Advisory Group on Immunisation (NTAGI) and the National Expert Group on Vaccine Administration for Covid-19 (NEGVAC).
  • The groups, after looking into available scientific evidence from clinical trials of the vaccine, concluded that the protection that it provides against Covid-19 is “enhanced” if the second dose is administered between 6-8 weeks.

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