3 Reasons You Shouldn't Get Your Hopes Too High About COVID-19 Vaccines

A safe and effective vaccine would be a shot in the arm for a world that's grown weary of the COVID-19 pandemic. The good news is that there's a lot of work going on to produce just such a vaccine. At least 19 novel-coronavirus vaccine candidates are now in clinical testing, according to the World Health Organization (WHO). Another 130 candidates are currently in preclinical trials.

But you shouldn't get your hopes too high for COVID-19 vaccines. Here are three reasons why.

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