Immunity

When referring to a 50% effectiveness, this means that for every 100 people, only 50 will become immune to the disease.

The answer to this is more complicated than one might think and centers around the question of the strength and longevity of the immune response.

Even more surprising is the fact that this was also seen in blood samples taken years before the coronavirus pandemic even began, meaning some people have pre-existing resistance against the virus.

This is the second case at Sheba Medical Center in which a patient recovered from the virus and was subsequently reinfected.

As an alternative, the group of doctors offered to keep the older population safer and to allow more freedom to Israel's youth.

There is no data from any human trials showing whether any protective antibody immune response would be strong- and long-lasting enough.

“That’s the feeling, that they’ve had it, everybody they know has had it, and the people they know who haven’t had it have some kind of immunity that we just don’t understand yet.”

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The experiment took place at the Peking Union Medical College in Beijing and used rhesus macaques as test subjects, as they are relatively similar to humans.

“Antibodies don’t mean you have immunity. [A test] doesn’t say if you have enough of the right number of antibodies or how long they live."