. . .there are three or four other coronaviruses that will give you cold-like symptoms. Some of these milder viruses are widespread, so you may have antibodies to them. The question is, do antibody tests for this coronavirus pick up antibodies for other coronaviruses? It looks like with many of the assays, there are some cross reactions. So that’s a problem because we’re gonna get false positives.
My question is whether cold conoraviruses may give some level of immunity to COVID-19 if the antibodies are that similar?
Cowpox is the basis of the smallpox vaccine; they are closely related so that immunity to cowpox gives immunity to smallpox. Could a recent cold give immunity to COVID-19?
This effect may help to explain the huge range of responses to COVID-19.