HSV, or herpes simplex virus, is an infection that causes herpes. Herpes can appear in different parts of the body but is most commonly seen on the mouth or genitals. In those who are immunocompromised, HSV infections are usually more severe, causing deep, painful lesions that can spread over large areas.
There are two types of herpes simplex virus,
HSV-1 and HSV-2.
Oftentimes, health professionals prescribe medication like acyclovir to help treat HSV infections. However, some types of HSV do not respond to this treatment, requiring a switch to a medication called foscarnet. This is currently the only treatment option for patients who do not respond to acyclovir.