Editor’s Note: Pediatric Infectious Disease Specialist and AAHPO Board Member Tsoline Kojaoghlanian, MD reviewed the article below and approved sharing it with AAHPO newsletter readers.

In early November 2023, the latest COVID variant, called JN.1, caused less than 5% of COVID-19 cases in the U.S. Now it is estimated to cause more than 60% of them. Virologists including Andy Pekosz, a professor in the Department of Molecular Microbiology and Immunology at the Johns Hopkins Bloomberg School of Public Health, are paying attention.

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 updated COVID-19 vaccine rolled out this fall.

What’s most important to understand about this variant?
This latest variant should be a reminder that we have tools to fight off COVID infection and minimize severe disease: Tests detect JN.1, the new vaccines protect against severe disease, and antivirals are still capable of treating infection from JN.1. We just have to use these tools more effectively than we have over the last six months.

So far, only 8% of children and 19% of adults have received the latest vaccine, so a lot of people are missing out on protection from this virus.

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