This is an informative link. Summary: - of 4 coronavirus strains in one study (all the type that cause common colds), none gave long term immunity after exposu

This is an informative link. Summary: - of 4 coronavirus strains in one study (all the type that cause common colds), none gave long term immunity after exposure - of those 4 strains, getting re-infected multiple times in the same year is common - each person tends to have a consistent reaction (weak/strong symptoms the first time through predict a similar experience in any later infections) - infection severity tends to run in families - 6 years after SARS, doctors found T-cells, but no B-cells in humans . Mice re-infected with SARS were protected from the worst effects or SARS by memory T-cells. Specifically related to covid-19: - macaque monkeys were infected by covid-19 and exposed again 4 weeks after recovery. none developed symptoms or had detectable virus in their throats - no reported cases of re-infection in Wuhan in the 5 months since the epidemic started