parasitophobia
noun
                                                                                                                            
                                                            par·a·si·to·pho·bia
                    
                                                                                                              
                                                                                                                                  ˌpar-ə-ˌsīt-ə-ˈfō-bē-ə 
                                                      
                                                          
            
                                
              
          
                                                      : a delusion that one is infested with parasites                                      
                
                    
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  Merriam-Webster unabridged




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