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Around 11.5% of people who had previously caught COVID became reinfected during the first Omicron wave in Iceland, according to new data. The study showed that people aged 18-29 had the highest risk of reinfection, with a 15% reinfection rate. Surprisingly, people who had had 2 or more doses of a vaccine had a slightly higher reinfection rate than people who had had one or fewer doses. However, the authors say this should be interpreted with caution because of the limitations of their study, including the low rates of vaccination among the previously infected people in their study. They say their results suggest that reinfection is more common than previously thought, although the question remains as to how much an Omicron infection protects against Omicron reinfection.
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