China has now reported six imported yellow fever cases from travelers to the African nation of Angola and the first case from east China’s Fujian Province was confirmed Thursday, according to Chinese media.

China /CIA
China /CIA

According to the Fujian Health and Family Planning Commission,  the patient is a 42-year-old woman from Fuqing City who presented with symptoms of fever, chills and joint pain in Angola on March 11 after receiving a yellow fever vaccination in a hospital in Luanda four days earlier.

She tested positive for yellow fever and is being hospitalized at Fuzhou Infectious Disease Hospital. She is in stable condition.

Earlier cases have been reported in Beijing and Shanghai.

Angola is reporting their worst yellow fever outbreak in 30 years. Since Dec. 2015, a total of 459 confirmed cases and 178 deaths have been reported to date.

Yellow fever virus is transmitted by infected mosquitoes, the most common species being Aedes aegypti – the same mosquito that spreads the Zika virus. Symptoms include fever, headache, muscle pain, nausea, vomiting, and fatigue. A small percentage of infected people experience a second more severe phase of illness which includes high fever, jaundice and internal bleeding. At least half of severely affected patients who don’t receive treatment die within 10 to 14 days.