Simian Immunodeficiency Virus (SIV): Biology & Model
Exploring the critical link between SIV and AIDS research.
Simian immunodeficiency virus (SIV) is a retrovirus of the genus Lentivirus that naturally infects African non-human primates. Due to its close genetic, structural, and pathogenic similarity to Human Immunodeficiency Virus (HIV), SIV has become one of the most indispensable experimental models for studying the mechanisms and treatments of AIDS.
I. Viral Characteristics
Morphology: Enveloped, spherical virus (~100 nm). The viral core is typically rod-shaped or conical.
Genome: Two copies of positive-sense ssRNA; contains gag, pol, env (structural) and tat, rev (regulatory) genes.
Stability: Sensitive to heat and disinfectants. Inactivated by 56°C for 30 mins or 10% bleach for 10 mins.
II. Transmission
Modes: Aggressive interactions, sexual contact, and vertical mother-to-infant transmission.
Clinical Effects: Causes progressive immune damage leading to lymphadenopathy, fever, weight loss, and chronic diarrhea.
III. Research Significance
SIV mimics HIV in viral morphology, replication mechanisms, and immune evasion strategies. Phylogenetic studies confirm that HIV originated from the cross-species transmission of SIV. Today, SIV-infected non-human primate models serve as the cornerstone for antiretroviral therapy (ART) and vaccine development.
IV. Disease Progression Timeline
1
Acute Phase (2–3 Weeks)
High fever (>39.5°C), generalized lymphadenopathy, and significant hematological changes (low WBC/Platelets).
2
Latent Phase (Months to Years)
Progressive decline of CD4+ T lymphocytes. Often asymptomatic despite active viral replication.
3
AIDS Stage
Systemic failure, opportunistic infections (PCP, CMV), and neurological symptoms resulting in multi-organ dysfunction.
By teamBiofargo
BIOFARGO TEAM
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