During millions of years, viruses have emerged and reemerged, with imbalance of photogenicity and transmissivity overtime. This letter describes that sometimes the nomenclature is uncertain what may actually happen during retrovirus evolution nowadays. This article discusses a possibility that human T-lymphotropic virus type 2 (HTLV-2) has been processed to incorporate the human genome in the last millions of years. Persistent viruses such as human immunodeficiency virus type 1 (HIV-1), HIV-2, and human T cell lymphotropic type 2 may also have potential of endogenization instead of a cytolytic process in a long time.

中文翻译：

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关于 HTLV-2 感染的古老出现的思考

在数百万年的时间里，病毒出现并重新出现，随着时间的推移，上光性和透射率失衡。这封信描述了有时命名法不确定当今逆转录病毒进化过程中实际发生的情况。本文讨论了人类 2 型嗜 T 淋巴细胞病毒 (HTLV-2) 在过去数百万年中经过处理以纳入人类基因组的可能性。持久性病毒如人类免疫缺陷病毒 1 型 (HIV-1)、HIV-2 和人类 T 细胞嗜淋巴细胞 2 型也可能在很长一段时间内具有内生化而不是细胞溶解过程的潜力。