MRNA Pioneer Katalin Karikó Shares Opinion on Vaccine Mixing

Renowned Hungarian biochemist, Karikó Katalin, shared her opinion on the question of mixing the different types of Covid vaccines. According to the mRNA pioneer researcher, people vaccinated with vector vaccines (AstraZeneca, Sputnik, Janssen) should receive a different type of vaccine as their third shot. However, whoever received mRNA-based (Pfizer, Moderna) vaccines can safely get the same type as a booster dose.

Prime Minister Viktor Orbán revealed last week that a third dose of Covid vaccines will be available in Hungary from August 1st. The government is leaving it up to GPs to decide exactly how long after the second dose and which type of vaccine will be given to those receiving a booster shot. However, official recommendations will include that preferably four months should pass between the second and third doses. In addition, family doctors will be advised to mix the vaccine types in all instances.

Regarding the issue, Katalin Karikó told RTL News that people vaccinated with vector vaccines such as AstraZeneca and Sputnik-V should definitely receive a different type of vaccine as their third shot. At the same time, people who received mRNA-based vaccines like Pfizer and Moderna can safely get the same type as a booster dose.

Earlier, Péter Vereckei, Managing Director of Pfizer Hungary, told Népszava that since clinical trials do not confirm the mixing of Pfizer vaccines, they do not currently support the interchangeability and combination of vaccines.

Last week, virus researcher Miklós Rusvai, also talked about the issue, suggesting the same thing as Katalin Karikó. According to Rusvai, people vaccinated with mRNA-based vaccines should receive the same type on their third visit to a vaccination clinic, since mRNA technology allows for multiple immunizations. Those vaccinated with vector vaccines on the other hand, or inactivated vaccines (Sinopharm), should receive a different type instead.

Featured photo by Tibor Rosta/MTI