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States with better sanitation more at risk to Covid? Theory needs testing

Studies and data indicate that the hygiene hypothesis may be at play, but experts say that there are more factors influencing deaths

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Coronavirus | Coronavirus Tests | Coronavirus Vaccine

Ishaan Gera  |  New Delhi 



Worker sprays disinfectant on an ambulance after carrying patients outside a Covid-19 testing centre in Guwahati.
Worker sprays disinfectant on an ambulance after carrying patients outside a Covid-19 testing centre in Guwahati.

David P Strachan, in his 1989 seminal paper “Hay fever, hygiene and household size”, proposed that lower incidence of infection in early childhood could be an explanation for the rise in allergic diseases such as hay fever. Popularly called the hygiene hypothesis, Strachan’s formulations have since been tested for various diseases and infections.

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First Published: Tue, April 06 2021. 08:27 IST

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