China has reported a case of deadly dengue fever after it detected a man suffering from bubonic plague.
Officials say a person was taken ill with the infection - which is spread by mosquitos - in the eastern city of Guangde on Sunday.
In extreme cases, the illness can result in death, according to The Mirror.
It comes after a herdsman was in Inner Mongolia was diagnosed with a bubonic plague infection on the same day.
State broadcaster CCTV said the patient battling dengue fever has been in hospital since being diagnosed.
They had previously travelled to India, Myanmar and Pakistan.
Tests are being carried out by government officials to find out if anyone else in surrounding neighbourhoods has contracted the disease.
Singapore is currently battling a dengue fever outbreak, with 15,273 cases identified this year.
The outbreak has been linked to 16 deaths.
Those who come down with the illness, which is transmitted by the Aedes mosquito, usually experience muscle pains and fever, as well as vomiting and headaches.
The World Health Organization (WHO) has said it is "carefully" monitoring the case of bubonic plague in China.
"We are monitoring the outbreaks in China, we are watching that closely and in partnership with the Chinese authorities and Mongolian authorities," WHO spokeswoman Margaret Harris told a UN press briefing in Geneva.
"At the moment we are not...considering it high-risk but we are watching it, monitoring it carefully," she added.
The bubonic plague, known as the "Black Death" in the Middle Ages, is a highly infectious and often fatal disease that is spread mostly by rodents.
Cases are not uncommon in China although they are becoming increasingly rare.
