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Before-symptom spread may complicate COVID-19 containment
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When conducting contact tracing as a COVID-19 containment measure, public health officials should include people with whom the infected person had contact before that person had symptoms, according to a study published yesterday in Morbidity and Mortality Weekly Report.
The study adds to mounting evidence of this type of spread and underscores the difficulty of identifying and isolating infected people.
In recognition of findings from this and other studies, the US Centers for Disease Control and Prevention recently revised its public health recommendations for managing the pandemic coronavirus disease to acknowledge that even people who appear healthy can spread the disease.Transmission 1 to 3 days before symptomsThe researchers reviewed
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COVID-19
United States
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Cases: 46 252 513
Deaths: 750 423
Recovered: 0
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India
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Cases: 34 321 025
Deaths: 459 652
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Brazil
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Cases: 21 835 785
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United Kingdom
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Russia
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