Covid-19 contacts should be tested, regardless of symptoms:
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People exposed to someone diagnosed with coronavirus should be tested whether they show symptoms or not, the World Health Organization said on 27 August, after US health authorities said they were not needed.

The US Centers for Disease Control and Prevention (CDC) website earlier this week shifted from its position that all close contacts of known Covid-19 cases should be tested, suggesting that those with no symptoms "do not necessarily need a test."

WHO's Covid-19 technical lead Maria Van Kerkhove told reporters the UN health agency recommends that "contacts, if feasible, should be tested, regardless of the development of symptoms.

"We know that people who have symptoms transmit, and we know that people who don't have symptoms can transmit the virus as well," she said.

While the main focus of testing is on those who develop symptoms, Van Kerkhove said that especially when investigating clusters of cases, "testing may need to be expanded to look for individuals who are on the more mild end of the spectrum or who may indeed be asymptomatic."

"What is really important is that testing be used as an opportunity to find active cases so that they can be isolated and so that contact tracing can also take place," she said.

"This is really fundamental to breaking chains of transmission."

Anthony Fauci, who leads the National Institute of Allergies and Infectious Diseases, voiced concern on 26 August that the new CDC recommendations "will give people the incorrect assumption that asymptomatic spread is not of great concern. In fact, it is."

Also, read CDC Updates Guidance for COVID-19 testing:

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