Virus
HTLV-1
Oncogenic retrovirus, ATLL and HAM/TSP
aych-tee-el-vee WUN
High-yield clue
HTLV-1 is the retrovirus of adult T-cell leukemia/lymphoma (ATLL) and HTLV-associated myelopathy (HAM/TSP).
Overview
The human T-lymphotropic virus type 1, an enveloped RNA retrovirus that integrates as provirus into CD4 T cells and is the classic transforming retrovirus linked to a leukemia and a neurologic syndrome.
Classification
- RNA virus
- Enveloped retrovirus (reverse transcriptase)
- Family Retroviridae, genus Deltaretrovirus
- Integrates as DNA provirus
Lab & identification clues
- Serology plus confirmatory testing vocabulary
- 'Flower cell' lymphocyte morphology concept
- Tax oncogene transformation concept
- Provirus integration detection vocabulary
Associations
- Adult T-cell leukemia/lymphoma (ATLL)
- HTLV-associated myelopathy / tropical spastic paraparesis
- Transmission via breastfeeding, sexual contact, and blood
- Long clinical latency epidemiology
Commonly confused with
- HIV
- Epstein-Barr virus
Frequently asked questions
What is HTLV-1?
The human T-lymphotropic virus type 1, an enveloped RNA retrovirus that integrates as provirus into CD4 T cells and is the classic transforming retrovirus linked to a leukemia and a neurologic syndrome.
What are the lab clues for HTLV-1?
Lab clues for HTLV-1 include Serology plus confirmatory testing vocabulary, 'Flower cell' lymphocyte morphology concept, Tax oncogene transformation concept, and Provirus integration detection vocabulary.
What is HTLV-1 commonly confused with?
HTLV-1 is commonly confused with HIV and Epstein-Barr virus.
Original student-study summary. Sources checked: OpenStax Microbiology 2e, NCBI Bookshelf Medical Microbiology, and CDC topic pages where applicable; reviewed 2026-06. Educational only; no diagnosis, treatment, dosing, or specimen-handling guidance.