There are at least nine HIV subtypes in total, and several recombinants of these.
2
目的了解流行于山东省境内艾滋病病毒（HIV 1）毒株的亚型及各种亚型的分布特点。
Objective To study the distribution of human immunodeficiency virus-1(HIV-1) strains subtypes in Shandong province and to study their source in order to predict the epidemic trend.
3
独一的例外是D亚型艾滋病病毒，它能导致非洲感染者更低的生存率，与泰国的这项研讨发明的生存率相似。
The only exception was subtype d, which causes lower survival rates in infected people in Africa, similar to rates found in the Thai study.
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