“The bottom line message is that from symptomatic COVID infection you do generate some immunity," said immunologist E. John Wherry of the University of Pennsylvania. “But it’s still much safer to get your immunity from vaccination than from infection.”
With the rapid spread of the omicron variant of COVID-19, when are people who have contracted the virus most contagious? However, experts said, there are a number of possible other factors at play, including whether the vaccine's effectiveness simply faded over time in many people and to what extent mask wearing and other behaviors played a part in what happened.
Overall, about 70% of the adults in each state were vaccinated; another 5% were vaccinated and had a previous infection. A little under 20% weren't vaccinated; and roughly 5% were unvaccinated but had a past infection. 6-fold lower in California and 4.5-fold lower in New York in those who were vaccinated but not previously infected.
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