Celebrating Apollo 11's Return to Earth

The mobile quarantine facility was, in fact, a specially fitted airstream trailer. Once in Houston, the astronauts were able to leave the unit but remain under quarantine. All told, they were kept in isolation for 21 days.
NASA

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The mobile quarantine facility was, in fact, a specially fitted Airstream trailer. Once in Houston, the astronauts were able to leave the unit but they remained under quarantine. All told, they were kept in isolation for 21 days.

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