The differences between Pfizer, Moderna, AstraZeneca and Janssen vaccines
The differences between Pfizer, Moderna, AstraZeneca and Janssen vaccines

What is the main difference between vaccines? What is its effectiveness? What risks do they have? With which cases of thrombi have been detected? We analyze the scientific evidence on the four drugs

Some syringes loaded with vaccine against covid-19.Javier CebolladaEFE

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