Hospitalizations for COVID are at an all-time low four years after the start of the pandemic, but new variants are in circulation. Meanwhile, bird flu has been found in 36 dairy herds across nine states, though there has been only one confirmed human case so far in 2024. To find out how concerned we should be about all of this, John Yang speaks with epidemiologist Katelyn Jetelina. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders