Nata-transmit lang ang HIV sa pamamagitan ng genital secretion, dugo o breast milk. Other bodily fluids like perspiration or saliva does not contain CD4 HIV cells. In short, kung ubo lang e hindi ka mahahawa.
I feel sorry for your co-worker. Don't ostracize them just because of HIV. If you feel bad about HIV transmission, how do you think they feel living with it?