How is it that people living with hiv/aids should tell their employers about their infection?

Depends on situation: In my opinion, the decision to disclose HIV status to an employer is up to the patient. However, i think this is a case by case basis. If an HIV positive individual is working in the food industry, then it may be prudent to disclose HIV in the event of a cut when preparing food to others. But if just working a desk job, it may not be necessary to disclose as chances are less likely to get hiv.