community spread
US /kəˈmjuːnɪti spred/
UK /kəˈmjuːnɪti spred/
1.
the spread of a contagious disease in a community from person to person, rather than from someone who has traveled to an affected area
:
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Health officials are concerned about the increase in community spread of the virus.
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Tracing contacts becomes more difficult with widespread community spread.