Which of the following is not a high-risk group for HIV infection（）
A. Intravenous drug users
B. Sex workers
C. Medical staff in HIV/AIDS wards
D. Haemophilia patients
E. Infants of HIV-positive women
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Which one of the following is not a feature of concurrent opportunistic infections of AIDS（）
A. Many HIV/AIDS patients see doctors because of opportunistic infections
B. It is an essential reason for the death of AIDS patients
Concurrent infections of multiple organs and systems may occur
D. Normally with single pathogen infection
E. Difficult to treat and easy to relapse
Which of the following is not a route of HIV transmission（）
A. Homosexual behaviours
B. Unclean heterosexual behaviours
C. Intravenous drug uses
D. Mother-to-infant transmission
Eating together
Which of the following cells is the main target of HIV（）
A. CD4+T lymphocyte cells
B lymphocyte cells
C. Monocytes
D. Neurogliocytes
E. NK cells
Which test of the following is used for confirming the diagnosis of HIV infection（）
A. Enzyme-linked immunosorbent assay （ELISA）
B. Radioimmunoassay
C. Indirect immunofluorescence test
D. Western blotting
E. Complement fixation test
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