So the vaccine elicited immunity subsidized by boosters are not effective at all against Omicron infection although they may mitigate the severity of the case? My sister and husband got their 4th shot a month before a trip and both caught Covid. They were persuaded to take Paxlovid; they had relatively mild Covid cases, but they both had a very unpleasant and much worse relapse several days later. After a month and 2 weeks of antibiotics, they're well.