China bars two WHO investigators for previously having COVID-19

Chinese authorities have prevented two members of the World Health Organization team from entering the country, due to tests that show the investigators have had the coronavirus at some point.

“All team members had multiple negative PCR and antibody tests for COVID-19 in their home countries prior to traveling,” the WHO announced on Twitter. “They were tested again in [Singapore] and were all negative. … But two members tested positive for IgM antibodies.”

The PCR test is a diagnostic used to identify people who currently have the disease caused by the novel coronavirus. IgM antibodies are the first countermeasure produced by immune system’s response to the coronavirus, as
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