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What are the various routes by which transmission of human immuno deficiency virus takes place ?
 
a. Blood collected from blood banks does not need to be examined for HIV before transfusion .
 
b. HIV can be transmitted from an infected person to a healthy person through contaminated needles or syringes .
 
c. HIV-positive women will not pass the virus on to their unborn children.
 
d. Promoting safe sex and the benefits of using condoms are helpful to control AIDS .