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Why are measles cases rising in the US?
Measles cases are increasing due to declining vaccination rates, which have fallen below the herd immunity threshold of 95%. This decline is partly driven by vaccine hesitancy and misinformation. As fewer people are vaccinated, the virus finds more hosts to infect, leading to outbreaks in communities with low immunization coverage.
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Is the flu season finally ending?
Yes, the 2025-26 flu season appears to be winding down after an intense early surge caused by a mismatched H3N2 strain. The decline in flu cases suggests that the peak has passed, but health officials advise remaining cautious, especially for vulnerable populations, until the season is officially over.
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What is HMPV and why is it surging?
Human metapneumovirus (HMPV) is a respiratory virus that causes cold-like symptoms. It is surging in Northern California, detected through wastewater surveillance. Unlike flu or measles, there is no vaccine or specific treatment for HMPV, making it a concern for public health officials as it spreads seasonally and can cause severe illness in some cases.
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How do vaccination rates affect disease outbreaks?
Vaccination rates directly impact the spread of infectious diseases. Higher vaccination coverage creates herd immunity, protecting even those who cannot be vaccinated. When vaccination rates drop, outbreaks become more likely, as seen with the recent rise in measles cases, which thrive in communities with low immunization levels.
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Are there risks of other diseases like polio or Lassa fever?
Yes, while measles and flu are currently in focus, other diseases like polio and Lassa fever remain threats in different regions. Botswana is increasing polio surveillance due to regional risks, and Nigeria faces ongoing challenges with Lassa fever. Vigilance and vaccination are key to preventing these diseases from spreading further.