Hiv/aids is the most common disease transmitted by blood.

I am going to assume this is a true/false question. If this is the case, the answer is True.

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True. Apart from being serious diseases in their own right, sexually transmitted infections increase the risk of contracting or transmitting HIV infection. Other viralinfections, such as herpes simplex virus type 2 (causing genital ulcer) or human papillomavirus (causing cervical cancer) are becoming moreprevalent.