When did Horizon Season 20 Episode 13 air?
Horizon Season 20 Episode 13 aired on April 25, 1983.


Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
In this report, Horizon looks at the spread of the AIDS virus in the United States and their search for the cause and cure of the deadly disease.
Direct answers for episode-level questions and details.
Horizon Season 20 Episode 13 aired on April 25, 1983.
This episode runs for approximately 60 minutes.
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