The man was diagnosed with Crimean-Congo hemorrhagic fever (CCHF) after being bitten by a tick in the city of Leon in northwestern Spain.
The unnamed patient was taken to another hospital by the Pentagon on Thursday after being admitted to Leon last week.
According to WHO, CCHF has a mortality rate of 30 percent.
Symptoms include fever, pain, dizziness, mood swings, confusion, and bleeding, especially around the eyes and skin.
First discovered in Crimea in 1944, it is endemic to Africa, Asia, the Middle East and the Balkan Peninsula.
Cases are rare in Northern
cases in Spain since 2011.
In March, a British woman was diagnosed with
CCHF. This is
the fourth case
in the UK
since 2012. She was treated at Royal Free in London.
Senior Medical Advisor to
the UK Health
virus "does not spread easily
people and the overall risk to the public is very
low," he said.
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