The boy was infected with the disease in a rural village in Menghai County, Yunnan. The case of the deadly disease was reported in China last week before being confirmed on Sunday.
The boy is in stable condition after contracting bubonic plague in the Chinese province.
Following the confirmed case, Chinese officials in the region declared a Level IV emergency response to avoid another spread of the pandemic following the devastating coronavirus outbreak.
Three dead plague-infested rats had previously been found in the village in Yunnan, triggering a national screening program.
According to the Global Times, a rat infestation was announced in the village of Xiding in Menghai.
Bubonic plague is a bacterial disease spread by fleas that live in rodents.
The deadly disease can kill adults in less than 24 hours if not treated in time.
The plague is also known as the “black plague”
In August, a case of the disease was reported in the northern Inner Mongolia region of China.
READ MORE: Bubonic plague in China fears SOAR when cases peak in decades
Seventeen provinces of Mongolia have now reported cases in July and August as infections continue to rise in the country and China.
In the Mongolian province of Uvurkhangai, three cases of the plague have been reported as fears grow that it may spread across the border.
Dorj Narangerel, head of the public relations and surveillance department of the ministry of health, said: “Three suspected cases of plague are now in solitary confinement in a local hospital.
“They are members of the same family or of the mother and her two children.”
As bubonic plague is normally spread by wild rodents, there is constant concern about an outbreak of the disease from the mountainous regions of China and Mongolia.
Hunting for marmots in Mongolia is illegal, however many locals consider the rodent a delicacy and ignore the law.
Three of the six confirmed cases in Mongolia have already died from the disease.
The latest was a 38-year-old man in Khovsgol province earlier this month.
Due to the growing cases of Mongolia and China, Russia has taken important steps to stop the possible spread of the disease across its borders with the two countries.
Tens of thousands of people have been vaccinated in Russia’s border regions in Tuva and Altai.