MrRuffles comments

Posted in: Experimental COVID-19 vaccine is put to its biggest test See in context

@Monty

There are a lot of different vaccines being developed. Even with positive preliminary results most of them are expected to fail in the end because of a number of reasons, for example protection not lasting for too long, protection not generated depending on age, possible side effects etc. If we're lucky out of the 100+ vaccines being developed a couple might provide lasting protection. In order to make sure that vaccines are safe a number of trials need to be conducted, starting from small and increasing the number of people tested at every stage. Each stage of these trials takes a few months to conclude. If one of the vaccines that are on the final stage mentioned in the article prove to be safe and provide lasting protection it still needs to be approved and mass produced in the millions. That's why even if we're lucky the soonest the vaccine can start circulating is around spring-summer 2021...

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