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Studies of biopsied tissue for the presence of Epstein - Barr virus and cytomegalovirus were negative , as were studies of blood , including the polymerase chain reaction , for the presence of the human immunodeficiency virus ( HIV ) .
 Epstein - Barr virus, cytomegalovirus, human immunodeficiency virus, HIV
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 Epstein - Barr virus, cytomegalovirus, human immunodeficiency virus, HIV