re: #18 Belafon

The answer is we do not really know. There hasn’t been much study on those that catch it and then are reexposed later.

But, given that 25% of all cold viruses are novel coronaviruses and we can catch a new version of the cold, I don’t think we can conclude that people are immune from future infection.

A 2007 study on SARS suggests that SARS immunity may last less than 3 years based on antibody level in survivors: ncbi.nlm.nih.gov
COVID-19 has been around for too brief a time to determine how long immunity persists for this new coronavirus. So no one knows how true this particular tweet turns out to be.