TRAVIS AFB (CBS13) — Travis Air Force Base airmen transported an active-duty service member who tested positive for COVID-19 from the Indo-Pacific region to the US on Friday, base officials announced.

Travis AFB said the individual is being treated at David Grant USAF Medical Center on base.

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Base officials said the aeromedical evacuation mission saw the first use of the Transport Isolation System (TIS) to the U.S. Indo-Pacific Command area to transport COVID-19 patients and the 18th employment overall since the first use in April.

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Officials said the base is one of three staging areas for the Air Force’s specialized evacuation missions during the pandemic.

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Base officials said the TIS is a biocontainment unit designed to allow medical care to be provided to patients in-flight without posing a risk to aircrew, medical attendants, and the airframe. Travis AFB said the TIS was originally developed during the 2014 Ebola outbreak in West Africa.