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After a brief internet search, the diagnosis confirmed what Drover suspected: She had a herpes zoster outbreak, also known as shingles.

And nearly all of the viral-disease pairings involved “neurotropic” viruses—those that can invade the central nervous system, such as herpes simplex and herpes zoster and some strains of influenza.

For around a third of these people, this same virus will reactivate years later and cause shingles, also called herpes zoster.

Shingles, also called herpes zoster, occurs in people who had chickenpox, a virus that causes itchy blisters.

Formally called herpes zoster, the disease infects about a third of people who have had chickenpox, usually showing up in older adulthood, according to the U.S.