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askST: How do CT values and serology tests tell if a person is still infectious?

The Straits Times sheds light on what these mean. Q: What is a serology test? A: A serology test involves a blood sample, to detect the presence of antibodies. It can show if the person might have been previously infected. Patients have antibodies around two weeks after they recover from the infection and will not have them at the point of infection. Serology tests are done by the Health Ministry to understand if a patient has the virus antibodies, which could imply an earlier infection. Q: What is CT value and how does it relate to viral load? A: Otherwise known as cycle threshold, CT value is a number that comes up during a real-time reverse transcription polymerase chain reaction (real-time RT-PCR) test, used widely here and touted as the gold standard for Covid-19 testing.

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