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'Human coronaviruses, which cause colds, don’t trigger long-term immunity after infection. But studies suggest reinfection occurs on average about a year after a previous infection; one study suggests the interval is much longer. So how do we make sense of intervals of mere weeks?
Perlman doesn’t know, though he notes it’s not clear if these are reinfections or relapses, because the viruses from the sequential infections were not isolated and compared.'
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https://www.statnews.com/2022/12/27/covid19-pandemic-what-most-surprised-experts/
@cyrilpedia I know someone with a 2 month interval. Second infection from an event with known index case and the two other individuals closest to index case also infected. We can presume XBF variant given local prevalence in Victoria, AU, points to immune escape from previous likely BA.5 acquired infection in different part of world 2 months earlier. Sequencing not always required for inference! Individual was boosted but not bivalent-boosted.