Flu pictures. Image 1 of 5. A microscopic image of flu virus proteins as the virus's genetic material is being copies; the components are shown in green, orange and blue.

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Share on Pinterest Health experts recommend getting your flu shot and COVID-19 booster simultaneously, ideally from late September through October. miodrag ignjatovic/Getty Images CDC guidelines ...

Unlike past flu shots, flu vaccines for the 2024-2025 season don't contain the "Yamagata lineage" of influenza viruses because evidence suggests that type of flu no longer exists.

Since H5N1 arrived in South America in 2022, bird flu had already killed dolphins, some 50,000 seals and sea lions along the coasts, and at least half a million birds, in Chile and Peru.