But even so, the chance of catching HIV
from a single such exposure is very, very low.
2-4) No, HIV
does not show up as migraine, or as headache (unless there also is fever, sore throat, etc). ARS symptoms start in 10-14 days, certainly never later than 3 weeks. The 3 most common symptoms are fever, usually 101 or higher; sore throat; and a body-wide skin rash; 70% of people with ARS have all three of these, and generally they all start within a few days of each other.