The virus that causes genital bleb calls pure sex bleb virus. This virus can be divided for 1 model, 2 model. 1 model conjunctiva of respiratory tract of main consist in, lip, mouth, eye, cornea and skin, can cause the ill damage of lumbar above place, the bleb that afore-mentioned place produce 99% be 1 model virus causes. 2 model virus is main place of genital of consist in men and women, be like the place such as neck of male penis, urethral, palace. The bleb that genital official produces 90% be 2 model virus place is caused.

Pure blister exanthema is poisonous, leave human body to cannot survive for a long time, accordingly, the direct contact that must rely on human body travels. Virus can invade human body via skin breakage or mucous membrane, the place that preexistence enters the mouth grows progenitive, sow all right through blood next medicinal powder. 2 model virus loves to encroach 15 ～ 30 years old the gender is active period young, bisexual concern is troubled person incidence of a disease is high. Outside dividing the patient that has a symptom, the person that some take poison can not have a symptom, but can infect others. The hooter that walks the street especially or unlicensed prostitute, the rate that take poison (2 model) can amount to 70% above.

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