Story perspectives

West Nile Virus Cases Surge 40% This Summer

9/16/2025

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Summary

Story summary

West Nile virus cases in the U.S. are 40% higher than usual this summer, with around 770 cases reported by early September.
Nearly 500 cases are classified as severe, according to the CDC.
Most infections arise from mosquito bites after mosquitoes feed on infected birds.
The outbreak is notable due to a high percentage of mosquitoes testing positive for the virus.
Serious symptoms, such as meningitis and paralysis, primarily affect individuals over 50 or those with weakened immune systems.

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Story summary

West Nile virus cases in the U.S. are 40% higher than usual this summer, with around 770 cases reported by early September.
Nearly 500 cases are classified as severe, according to the CDC.
Most infections arise from mosquito bites after mosquitoes feed on infected birds.
The outbreak is notable due to a high percentage of mosquitoes testing positive for the virus.
Serious symptoms, such as meningitis and paralysis, primarily affect individuals over 50 or those with weakened immune systems.