Factors contributing to the likelihood of contracting hiv infection include:
a. number and frequency of sexual contact
b. intravenous drug use
c. sexual partner of people with hiv/aids
d. people with other sexually transmitted diseases
e. all of above

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.

the areas around the equator