Herpes:

https://www.cdc.gov/std/herpes/treatment.htm

Is there a cure or treatment for herpes? There is no cure for herpes. Antiviral medications can, however, prevent or shorten outbreaks during the period of time the person takes the medication. In addition, daily suppressive therapy (i.e. daily use of antiviral medication) for herpes can reduce the likelihood of transmission to partners.

Several clinical trials have tested vaccines against genital herpes infection, but there is currently no commercially available vaccine that is protective against genital herpes infection. One vaccine trial showed efficacy among women whose partners were HSV-2 infected, but only among women who were not infected with HSV-1. No efficacy was observed among men whose partners were HSV-2 infected. A subsequent trial testing the same vaccine showed some protection from genital HSV-1 infection, but no protection from HSV-2 infection.

Ebola:

https://www.cdc.gov/vhf/ebola/treatment/index.html

Antiviral Drugs There is currently no antiviral drug licensed by the U.S. Food and Drug Administration (FDA) to treat EVD in people.

During the 2018 eastern Democratic Republic of the Congo outbreak, four investigational treatments were initially available to treat patients with confirmed Ebola. For two of those treatments, called regeneron (REGN-EB3) and mAb114, overall survival was much higher. These two antiviral drugs currently remain in use for patients with confirmed Ebola.

Drugs that are being developed to treat EVD work by stopping the virus from making copies of itself.

TL;DR; at best we can manage.

The rule of the thumb is "prevent viral infections via vaccinations because they cannot be treated" and "treat bacterial infections using antibiotics because they cannot be prevented"