In people who had been infected with SARs-CoV-2 and were then vaccinated, the outcome was completely different: All the vaccines provided a major immunological boost against re-infection, and the differences between the mRNA shots and the other ones "began to blur," says John Moore, a virologist at Weill Cornell Medicine in New York who was not involved in the study.

Of the five vaccines tested, four produced nearly identical immune reactions. This group included Pfizer's mRNA shot as well a shot made by AstraZeneca, the Sputnik V shot made by the Gamaleya Research Institute of Epidemiology and Microbiology in Russia, and one from Cansino, a Chinese company. A fifth vaccine, CoronaVac, made by Sinovac Biotech in China, was the worst performer, though still protective to some degree. //

The study's point that vaccinating after a case of COVID provides protection against future infections is supported by a newly-published Israeli study. Researchers found that unvaccinated individuals who had recovered from COVID and were then given the Pfizer vaccine had significantly lowered reinfection risks after getting a Pfizer vaccine.

Summing up the two findings, Moore says "The Israeli paper tells you that vaccinating convalescent people has real-world benefits and the Rockefeller paper tells you the vaccine you use [either mRNA or non-mRNA] is inconsequential — you get the benefits from each."