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Hotter and humid weather may not stop COVID-19: Study

Hotter and humid weather may not stop COVID-19: Study

Toronto:Temperature and latitude are not associated with the spread of the COVID-19 disease, say researchers, adding that they found a weak association between humidity and reduced transmission.

The results - that hotter weather had no effect on the pandemic's progression - surprised the authors. "Our study provides important new evidence, using global data from the COVID-19 epidemic, that these public health interventions have reduced epidemic growth," said study researcher Dr Peter Juni from the University of Toronto, and St Michael's Hospital in Canada.

The study, published in the Canadian Medical Association Journal, looked at 144 geopolitical areas - states and provinces in Australia, the US and Canada as well as various countries around the world - and a total of more than 3,75,600 confirmed COVID-19 cases. China, Italy, Iran and South Korea were excluded because the virus was either waning in the case of China or in full disease outbreak at the time of the analysis in others.

To estimate epidemic growth, researchers compared the number of cases on March 27 with cases on March 20, and determined the influence of latitude, temperature, humidity, school closures, restrictions on mass gatherings and social distancing measured during the exposure period of March 7 to 13.

They found little or no association between latitude or temperature with epidemic growth of COVID-19 and a weak association between humidity and reduced transmission. "We had conducted a preliminary study that suggested both latitude and temperature could play a role. But when we repeated the study under much more rigorous conditions, we got the opposite result," Juni said. The researchers did find that public health measures, including school closures, social distancing and restrictions of large gatherings, have been effective.

"Our results are of immediate relevance as many countries, and some Canadian provinces and territories, are considering easing or removing some of these public health interventions," Juni added. According to the research team, summer is not going to make this go away.

The authors noted several study limitations, such as differences in testing practices, the inability to estimate actual rates of COVID-19 and compliance with social distancing. When deciding how to lift restrictions, governments and public health authorities should carefully weigh the impact of these measures against potential economic and mental health harm and benefits, they said.

However, last month, Indian microbiologist Professor Y Singh who worked with the NIH and also with the US Army Lab on 'Project Anthrax', had told IANS that an expected temperature of over 40 degrees by the end of April can slow down the affect of the coronavirus. In February, US President Donald Trump said that the coronavirus will "go away" in April. The logic he cited was that the heat generally kills this kind of virus.

Trump is not the only politician to express the hope that things will improve in the summer. Britain's Health Secretary Matt Hancock had also reportedly said that the virus could be less transmissible during summer.

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