Students at universities in the United States are being asked to re-vaccinate themselves if they have been vaccinated against Covid-19 with Indian-made Covaxin or Russia’s Sputnik V as these vaccinations are still not approved by World Health Organizations, Hindustan Times has reported.

Milloni Doshi, 25 years of age who will be joining Columbia University’s School of International and Public Affairs soon and has already been administered two doses of Covaxin in India says, “I am just concerned about taking two different vaccines. They said the application process would be the toughest part of the cycle, but it’s really been all of this that has been uncertain and anxiety-inducing.”

On the concerns of having two different vaccines, spokesperson for the Centers for Disease Control and Prevention (CDC) Kristen Nordlund said: “Since Covid-19 vaccines are not interchangeable, the safety and effectiveness of receiving two different vaccines have not been studied.”