Three-quarters of seasonal and pandemic influenza infections never caused symptoms, a population-based comparison of serologic and weekly symptom monitoring showed.
Only 23% of unvaccinated people with serologic evidence of infection reported respiratory or flu-like symptoms, Andrew Hayward, MD, of University College London, and colleagues found in the Flu Watch study.
Just 17% of the symptomatic cases confirmed by nasal swab analysis saw a doctor for their flu, the researchers reported online in Lancet Respiratory Medicine.
“Reported cases of influenza represent the tip of a large clinical and subclinical iceberg that is mainly invisible to routine surveillance systems,” they wrote.
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Further Readings of Interest
Paul Patterson – Influenza / Maternal Immune Acivation Model of Autism
Gestational flu exposure induces changes in neurochemicals, affiliative hormones and brainstem inflammation, in addition to autism-like behaviors in mice.
Is maternal influenza or fever during pregnancy associated with autism or developmental delays? Results from the CHARGE (CHildhood Autism Risks from Genetics and Environment) study.