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== Infection ==

== Infection ==

After exposure, the virus invades and replicates in immune cells near the site of infection.  It quickly spreads to regional lymph nodes and via the blood stream to the rest of the body.

After exposure, the virus invades and replicates in immune cells near the site of infection.  It quickly spreads to regional lymph nodes and via the blood stream to the rest of the body.  During this stage the patient may experience ''Acute Retroviral Syndrome'', a vague flu-like illness.  The patient is often asymptomatic for the first 5-10 years after infection.  By that time, untreated, progression to AIDS in inevitable, except in a small subset of patients.

== References ==

== References ==