Serologic testing helped scientists establish connections between two people with COVID-19 from Wuhan, China, to three clusters in Singapore, according to a study yesterday in The Lancet Infectious Diseases.

Also, a study today in The Journal of Infectious Diseases found that four of eight COVID-19 cases in three family clusters in China were asymptomatic or had only mild symptoms.

In a related study out of China in the same journal, researchers describe how the novel coronavirus lingered in 26 asymptomatic patients for as long as 36 days, how improvement on computed tomography (CT) may not correspond with a negative reverse-transcription polymerase chain reaction (RT-PCR) test, and false-negative results may occur.

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