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False colour transmision electron micrograph of particles of a herpes simplex virus within an infected cell. The colouring technique shows virus particles (yellow with green cores) but little cellular detail. Herpes simplex exists in two general forms: type I is associated with oral cold sore infections and type II with genital herpes infections. Herpes simplex is one of man's most common viral parasites yet is uncurable. Attacks appear after stimulation by sunlight or infection, causing blisters on the mouth or genitalia that persist for weeks before subsiding. There is an unproven association between type II infection and cervical cancer in women.
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