Many worry that people who test positive for COVID-19 without symptoms (asymptomatic) may still infect others at a fast rate similar to people with symptoms. However, data from Singapore suggests that this is not true. In Singapore, workers in construction, marine, and factories are tested once a week or every two weeks. All close contacts of those who test positive for COVID-19 are tested as well. Everyone with a positive test, regardless of symptoms, results in contact tracing. Contact tracing is when public health workers identify and notify the people who were exposed to infected people. Also, close contacts of infected people are quarantined, and they are only released from quarantine when they test negative for COVID-19. The results indicate that people who test positive without symptoms can still spread COVID-19, but they are much less infectious than people with symptoms. This suggests that contact tracing should be used to find people with asymptomatic COVID-19 because they can still spread the disease. However, if resources are limited, then focusing contact tracing on people with symptoms might be more effective to reduce the spread of COVID-19.


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