Should we mix Covishield and Covaxin? What do studies say about mixing Covid-19 vaccines?

Shortage of Covid-19 vaccine doses has left many wondering if they can mix and match two different vaccines - Covishield and Covaxin in India.

Nitin Shukla, a resident of Delhi's Shalimar Bagh, got the first dose of Covid-19 vaccine - Covaxin - in the first week of May. Now, Delhi has halted vaccination for the 18-44 age group due to a shortage of Covid-19 vaccine doses. Nitin is in his mid-20s. Q: Can I take Pfizer/Astra Zeneca/JJ after getting vaccinated with Covaxin or Sinopharm etc? Can I mix and match vaccines?As of today, I’d say no. It’s being studied. Besides rare exceptions don’t mix.This WILL change. Wait 2-3 months instead of taking a blind risk. According to the current Covid-19 vaccine dosing regimen, Nitin would be due for his second dose in the first week of June. But he is not sure if he can get the second dose as a Covishield jab either in Delhi, or neighbouring Uttar Pradesh or Haryana, if he does not get the Covaxin dose on time. There are many like Nitin facing this vaccine dosing dilemma. Shortage of Covid-19 vaccine doses has left many wondering if they can mix and match two different vaccines - Covishield and Covaxin in India.