"but it isn't" That is simply untrue. You are likely referring to the Israeli data which has not reproduced. Proof: https://www.cdc.gov/mmwr/volumes/70/wr/mm

"but it isn't" That is simply untrue. You are likely referring to the Israeli data which has not reproduced. Proof: https://www.cdc.gov/mmwr/volumes/70/wr/mm7044e1.htm?s_cid=mm7044e1_w https://www.cdc.gov/mmwr/volumes/70/wr/mm7044e1.htm?s_cid=mm... . Bottom line: natural immunity is not so great. Get vaccinated. What drives the difference? Just speculating, but during natural infection the immune system will generate a huge number of disparate antibodies that do nothing because when they bind their targets it doesn't block the virus. Vaccination localizes the immune response to the key cell-receptor binding sites.