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How effective are thermal scanners in detecting people infected with the new coronavirus?

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Ramesh Ramesh
Answered on March 20,2020

Thermal scanners are effective in detecting people who have developed a fever (i.e. have a higher than normal body temperature) because of infection with the new coronavirus.

However, they cannot detect people who are infected but are not yet sick with fever. This is because it takes between 2 and 10 days before people who are infected become sick and develop a fever.

Source: World Health Organization, March 20, 2020

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