The aircraft carrier USS Ronald Reagan is pictured during a port visit at Busan, South Korea, Saturday, Oct. 21, 2017.

The aircraft carrier USS Ronald Reagan is pictured during a port visit at Busan, South Korea, Saturday, Oct. 21, 2017. (Stars and Stripes)

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YOKOSUKA NAVAL BASE, Japan — A Yokosuka-based sailor tested positive Thursday for coronavirus, becoming the first U.S. service member in Japan confirmed to have the illness, U.S. Forces Japan officials told Stars and Stripes.

The sailor — whose name was not released — had been confined to a room since returning from leave in the United States on March 15, said USFJ spokeswoman Maj. Genieve White.

The confinement was in accordance with a restriction of movement directive for those returning from international travel that USFJ issued four days prior.

The sailor has been placed in isolation and is being treated at Naval Hospital Yokosuka, White said.

USFJ went nearly three months without a positive case after the coronavirus was first discovered in Wuhan, China, in December. The illness has since become a global pandemic.

As of Wednesday, Japan has reported 1,193 confirmed cases, an increase of 320 over the course of a week, according to the World Health Organization situation reports. Forty-three people have died of the illness in Japan — more than double the number of deaths reported a week prior.

The Yokosuka base on Thursday set its health protection condition to Charlie following Indo-Pacific Command’s Wednesday decision to upgrade the threat level. At Charlie, the community is considered at a “substantial risk” of infection and further restrictions are implemented to control the coronavirus’ spread.

On Wednesday, Navy Forces Japan restricted all Navy personnel to the installations or their off-base homes.

“All off-base restaurants, bars, cafes, night clubs and like establishments, indoor fitness facilities, onsens and public baths are off limits,” Naval Forces Japan commander Rear Adm. B. P. Fort wrote in a memorandum announcing the change Wednesday.

Naval Hospital Yokosuka gained the capability to process coronavirus test results last week and can now analyze about 40 a day. Previously, tests were sent to laboratories off base in Japan or to the U.S. for processing, and results could take up to a week to return. Twitter: @CaitlinDoornbos

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Caitlin Doornbos covers the Pentagon for Stars and Stripes after covering the Navy’s 7th Fleet as Stripes’ Indo-Pacific correspondent at Yokosuka Naval Base, Japan. Previously, she worked as a crime reporter in Lawrence, Kan., and Orlando, Fla., where she was part of the Orlando Sentinel team that placed as finalist for the 2017 Pulitzer Prize for breaking news. Caitlin has a Bachelor of Science in journalism from the University of Kansas and master’s degree in defense and strategic studies from the University of Texas at El Paso.

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