The viral infections, however, are not yet curable and therefore require special prevention efforts.

但是, 病毒类的性传播疾病仍是不能治愈的,因而是一类需要特别做出预防努力的疾病.

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Special prevention efforts must be directed at intravenous drug users and those with risky sexual behaviors.

特殊的预防措施必须针对静脉毒品注射者和那些有高危险性行为的人.

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