pathogen
noun
                                                                                                                            
                                                            path·o·gen
                    
                                                                                                              
                                                                                                                                  ˈpa-thə-jən  
                                                      
                                                          
            
                                
              
          
                                                      : a specific causative agent (such as a bacterium or virus) of disease                                      
                
                    
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  Merriam-Webster unabridged




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