RETROVIRUS - an RNA virus
IMMUNOPRIVILEGED SITE - a part of the mammalian body which does not admit the immune cells because if it did, then the damage to the body part would be worse than being infected.
examples of immunoprivileged sites:
1. BRAIN, SPINAL CORD, NERVES,
2. UTERUS during pregnancy
3. HAMSTER CHEEK POUCHES
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