community spread
noun
            variants  
 or community transmission
        
    
                                
              
          
                                                      : the spread of a contagious disease within a community                                      
                
                                
            specifically                
          
                                                      : the spread of a contagious disease to individuals in a particular geographic location who have no known contact with other infected individuals or who have not recently traveled to an area where the disease has any documented cases                                       
              
                             
            Dr. [Anthony] Fauci, who is the top coronavirus expert in the country, said community spread made it almost impossible to predict how many cases there will be.    —
Megan Sheets and Emily Crane          
                                       … a 50-year-old New Rochelle man became the first known person in New York to contract the virus through community spread.    —
Jon Campbell          
                                       In areas where community transmission is high, schools may be closed and businesses may ask employees to work from home.    —
Melissa Healy          
                         
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  Merriam-Webster unabridged




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