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The emergence of a novel SARS-like coronavirus (SARS-CoV-2) in Hubei Province, China, and its rapid spread through many countries of Asia and elsewhere, have been labeled as an international emergency. The massive attempts at quarantine have had some salutary effects on the spread of this serious respiratory disease the virus causes, but much about the factors controlling contagion has yet to be discovered. Now, two brief reports that bear on communicability of this virus have been published.
Zou and colleagues measured SARS-CoV-2 viral load in 18 persons in Zhuhai, Guangdong, China (9 men and 9 women; median age, 59 years), including 4 secondary cases, one of whom was asymptomatic but was a close contact of a patient. Infection was confirme…