In the past, HIV was spread in blood products, such as whole blood or the "factor" used by hemophiliacs. Many people were infected this way. The blood supply is now much more strictly tested and controlled. The odds of being infected from receiving blood or factor in the U.S. are extremely low.
You cannot get HIV from donating blood – a new clean needle is used for each donation.
Some people, primarily healthcare workers, are occasionally infected through needle sticks with infected blood, or through other medical accidents. This is a very tiny percentage of overall infections.
Today, the most common ways HIV is passed from one person to another are:
Re-using and sharing needles
Unprotected/unsafe sex (no condoms or other barrier devices)
Mother-to-child
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