Even without a Covid-19 vaccine, theres reason for hope – CNN

But in the case of Covid-19, according to one study, not everybody infected by the virus makes the
neutralizing antibodies that are necessary to clear the virus and fewer still make them in high numbers. What we know from nearly 60 years of observing coronaviruses is that even if a body’s immune system can clear the virus, the pathogen can likely
reenter the system and cause illness again.

Of the
more than 100 vaccines currently in development, the ones tested on primates
have not prevented nasal infections, though in
one case the vaccine prevented the disease from spreading to the lungs where it is known to cause severe damage. However, since Covid-19 progresses
somewhat differently in monkeys than in humans, it’s hard to know how effective these vaccines will be in human trials.

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