1. Sexual intercourse
2. stuck with infected needles/sharps
3. sharing needles
4. transfusion of infected blood
5. transplantation of infected organs
#1, they remain outside the target cell. #2, bind to the receptors inside the target cell. #3, they have no target cells. #4, are made of proteins.
Empathy is more of a deep understanding
Is this a question or an answer?
