![]() There is no guidance yet for if or when a second bivalent booster would be recommended. If you got a bivalent booster when it was first available, should you be considering another booster now? XBB.1.5 is derived from the omicron variant BA.2, and while the current bivalent vaccine was developed for the BA.5 variant, it has been shown to generate antibodies that recognize BA.2. ![]() Lab studies suggest that the bivalent vaccine is still effective in protecting against severe disease, though perhaps not as much against infection. This is for two reasons: The XBB.1.5 variant is more immune-evasive, and a person’s immune response naturally decreases over time following infection.ĭo we know yet how well the latest bivalent boosters work against this variant? We don’t have firm numbers yet, but based on what we know about the XBB variants, someone who has been infected with an earlier omicron variant is likely susceptible to reinfection with XBB.1.5. After exposure, it may take 5 days before you begin to develop symptoms.Īre people who’ve already had COVID more likely to be reinfected by XBB.1.5? The period of infectiousness for XBB.1.5 is very similar to that of the other omicron variants that have been circulating over the past year: You are contagious one to two days before your symptoms begin, and you are still contagious for at least two to three days after your symptoms begin-though some people can continue to have the detectable live virus for up to a week after symptom onset. What does the transmission timeline look like for XBB.1.5? We just have to use these tools more effectively than we have over the last six months. This latest variant should be a reminder that we have tools to fight off COVID infection and minimize severe disease: The vaccines are still protecting against severe disease, and antivirals are still capable of treating infection from XBB.1.5. ![]() For the rest of us, what’s most important to understand about this variant? Virologists are watching XBB.1.5 due to its high number of mutations. However, we’re not seeing this variant cause the same type of surges in overall cases that omicron did when it entered the population last winter. The XBB.1.5 virus has quickly become a higher percentage of total COVID cases in the United States. The XBB.1.5 variant has a mutation virologists believe is helping the virus better bind to cells and thus be more transmissible. The XBB family of variants emerged a few months ago and caught virologists’ attention because it contains more mutations to evade immunity than any other variant. Here, Pekosz explains what virologists are seeing, what this new variant means for case rates and treatments, and why it’s so important for more people to get the bivalent booster. Virologists including Andy Pekosz, a professor of Molecular Microbiology and Immunology, are paying attention. This article was updated on January 9, 2023, to reflect updated CDC data.įour weeks ago, the XBB.1.5 variant caused less than 10% of COVID-19 cases in the U.S.
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