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Home Health and health care

People with no Symptoms Cause most Infections

Top by Top
November 23, 2020
in Health and health care
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Most coronavirus infections are spread by people who have no symptoms and masks are the only available protection against this, the US Centers for Disease Control and Prevention (CDC) said in newly updated guidance.

The warning follows the second wave of Covid-19 infection, which is spreading at an unprecedented speed. So far, the World Health Organisation (WHO) has recorded 55.6 million confirmed cases and 1.34 million deaths across the globe.

The United States remains the worst-affected country with 11.8 million confirmed cases and more than 252,000 deaths. India is the second worst affected country with more than nine million confirmed cases.

The current Trump administration discourages the use of masks and many US health experts blame this attitude for the devastations that the coronavirus has caused in the United States. The incoming Biden administration has pledged to promote the use of masks and other preventive measures.

“Asymptomatic or pre-symptomatic infected wearers who feel well and may be unaware of their infectiousness to others are estimated to account for more than 50 per cent of transmissions,” said the new CDC guidelines issued during the weekend.

The CDC noted that studies done by various international agencies show that 40-45 per cent of infected people never develop symptoms.

“Among people who do develop symptomatic illness, transmission risk peaks in the days just before symptom onset (pre-symptomatic infection) and for a few days thereafter,” the US agency added. “The number of infections transmitted peaks when virus levels peak.”

Masks can prevent this spread.

Explaining how masks help, the CDC said the face-covers reduce the emission of virus-laden droplets, which is called “source control”, and were especially useful for preventing infections from asymptomatic patients.

Masks also help reduce inhalation of these droplets by the wearer, which is called “filtration for personal protection”. The community benefit of masking for SARS-CoV-2 control is due to the combination of these effects; individual prevention benefit increases with increasing numbers of people using masks consistently and correctly.

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