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There are two strains of herpes simplex viruses:Herpes simplex virus type 1 (HSV-1) is usually associated with infections of the lips, mouth, and face. It is the most common herpes simplex virus and many people develop it in childhood.
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Everyone with cancer has a higher risk of catching viral infections of any type. This is because the cancer itself, and the methods used to treat it, affect the immune defense mechanisms that fight infection.
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A primary infection of HSV-1 typically occurs between six months and five years of age and is systemic (affecting the whole body). Transmission is generally via respiratory droplets (HSV-1) or direct contact (HSV-1 and HSV-2).
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