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` ` It ' s a potential dual epidemic , ' ' he said , adding that people with immune systems weakened by the AIDS virus are especially vulnerable to contracting TB , which he called an ` ` opportunistic disease . ' '
 he, people with immune systems weakened by the AIDS virus, he
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 he, people with immune systems weakened by the AIDS virus, he