Does heat kills Coronavirus, a report by WHO

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Read on to know about survival rate of Coronavirus at different conditions and on varied surfaces like, metal , plastic , paper

According to a recent study by WHO, Coronavirus may survive extreme of heat and cold and may also stay alive on different surfaces for quite long.As per the WHO studies,there is only minimal reduction in virus concentration after 21 days at 4°C and -80°C.Where as reduction in virus concentration by one log only at stable room temperature for 2 days. This would indicate that the virus is more stable than the known human coronaviruses under these conditions.Heat at 56°C kills the SARS coronavirus at around 10000 units per 15 min (quick reduction).

Other findings from the WHO study suggests that virus is stable in faeces(and urine) at room temperature for at least 1-2 days.Virus is more stable (up to 4 days) in stool from diarrhea patients (which has higher pH than normal stool) but  loses infectivity after exposure to different commonly used disinfectants and fixatives.

Meanwhile another study from UCLA  suggests that people may acquire the coronavirus through the air and after touching contaminated objects. Scientists discovered the virus is detectable for up to three hours in aerosols, up to four hours on copper, up to 24 hours on cardboard and up to two to three days on plastic and stainless steel.

"This virus is quite transmissible through relatively casual contact, making this pathogen very hard to contain," said James Lloyd-Smith, a co-author of the study and a UCLA professor of ecology and evolutionary biology. "If you're touching items that someone else has recently handled, be aware they could be contaminated and wash your hands."

The study attempted to mimic the virus being deposited onto everyday surfaces in a household or hospital setting by an infected person through coughing or touching objects, for example. The scientists then investigated how long the virus remained infectious on these surfaces.

The study's authors are from UCLA, the National Institutes of Health's National Institute of Allergy and Infectious Diseases, the Centers for Disease Control and Prevention, and Princeton University. They include Amandine Gamble, a UCLA postdoctoral researcher in Lloyd-Smith's laboratory.

In February, Lloyd-Smith and colleagues reported in the journal eLife that screening travelers for COVID-19 is not very effective. People infected with the virus -- officially named SARS-CoV-2 -- may be spreading the virus without knowing they have it or before symptoms appear. Lloyd-Smith said the biology and epidemiology of the virus make infection extremely difficult to detect in its early stages because the majority of cases show no symptoms for five days or longer after exposure.

"Many people won't have developed symptoms yet," Lloyd-Smith said. "Based on our earlier analysis of flu pandemic data, many people may not choose to disclose if they do know."

Tags : #Corovirus #WHO #UCLA #Heat

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