When avian influenza spills over from birds to humans, it can be extremely deadly with mortality rates as high as 50 per cent.
Because inhaled vaccines target the lungs and upper airways where respiratory viruses first enter the body, they are far more effective at inducing a protective immune response, the researchers report.
After two years of COVID-19, it’s understandable that many people are weary of infection prevention measures. But simply being tired of the pandemic is no reason to let our guard down.
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