Interviews with 16 patients infected by a visiting Chinese colleague at a company in southern Germany reaffirms that the virus often stays hidden. Most of them exhibited no or only mild symptoms, researchers say.
Global efforts to contain Covid-19 still face a "huge challenge," warns The Lancet Infectious Diseases magazine in a Bavaria case study confirming that some patients were infected before symptoms emerged or only as they started.
The London-based medical publisher focused on Europe's first case in January, explaining how the virus Sars-Cov-2 spread from a Chinese colleague visiting Munich to workmates of the firm Webasto and then their households.
From "Patient Zero" a sequence of four "generations" of infection was traced with "all patients recovered fully" via quarantine, said the magazine, citing testing and interviews done mainly by German epidemiologists and health authorities.
The potentially lethal virus' incubation period - between initial infection and symptoms - was four days, concluded the authors, who included Chinese and Spanish contributors.
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