7 doctors weighed in:

What type of herpes simplex virus causes cold sores?

7 doctors weighed in
Dr. Robert Kwok
Pediatrics
3 doctors agree

In brief: Type 1 more common

Cold sores on or near the lips are due to recurrence of herpes type 1 or 2.
Herpes viruses, after the initial infection, live in a person's nerves and travel down the nerves to the surface to form blisters that break open, spreading more virus. Type 1 is more common on the lips, and type 2 more common on the genitals. With people engaging in oral sex, either type can be in one or both locations.

In brief: Type 1 more common

Cold sores on or near the lips are due to recurrence of herpes type 1 or 2.
Herpes viruses, after the initial infection, live in a person's nerves and travel down the nerves to the surface to form blisters that break open, spreading more virus. Type 1 is more common on the lips, and type 2 more common on the genitals. With people engaging in oral sex, either type can be in one or both locations.
Dr. Robert Kwok
Dr. Robert Kwok
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Dr. Robert Brodsky
Dentistry
1 doctor agrees

In brief: Herpes Simplex

The name.

In brief: Herpes Simplex

The name.
Dr. Robert Brodsky
Dr. Robert Brodsky
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Dr. Kyle Shank
Dentistry

In brief: Hsv-1. Usually

Fever blisters are usually caused by hsv-1, but they can be caused by hsv-2.

In brief: Hsv-1. Usually

Fever blisters are usually caused by hsv-1, but they can be caused by hsv-2.
Dr. Kyle Shank
Dr. Kyle Shank
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