Why would someone fully vaccinated still catch corona?

The fourth and final reason, each person is unique and has her or his own molecular immunological makeup.

“We know some people have a tendency to be very robust and stand up to infections, and other people can be a bit more sensitive,” Gershoni said. “When talking in terms of vaccinating five million people in Israel, you are seeing the full spectrum of people with various levels of immune competence.”

But he cautioned that when we talk about “breakthrough infections,” sometimes people were infected before they got their second dose or even their first.

“One has to put it into perspective,” Gershoni said. “Those who do get infected typically are not subject to devastating disease and death.”