I& #39;m seeing (too) many reports of "Infected people who recovered are testing positive again!!" My take as a molecular biologist:

The fact that the world was poorly prepared for a #pandemic of this type doesn& #39;t make COV-2 uniquely different from all other viruses. 1/3 #COVID19

Everyone infected will mount an #antibody response, aka various degrees of #immunity. The 2-10% re-infection may be due to: inaccurate tests; insufficient antibody levels for secondary defense; permanent viral reservoirs in recovered individuals (à la Herpes or Hepatitis); 2/3

[ctd] rapid mutation (a well-known attribute of all RNA viruses). What& #39;s problematic is the haste of governments to issue "clean health" certificates to clear people for work or travel. It won& #39;t work as they (like to) think. A flu-type #vaccine is the only real solution. 3/3