What is the common in AIDS, mumps and poliomyelitis?

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Q: 110 (SSC/NA)
What is the common in AIDS, mumps and poliomyelitis?

question_subject: 

Science

question_exam: 

SSC

stats: 

0,12,13,2,6,12,5

keywords: 

{'aids': [4, 0, 1, 3], 'poliomyelitis': [2, 0, 2, 1], 'mumps': [1, 0, 0, 0], 'viruses': [2, 0, 0, 4], 'effective vaccine': [1, 0, 0, 0], 'young children': [1, 0, 0, 0], 'germs': [2, 1, 0, 1], 'blood transfusions': [1, 0, 0, 0]}