The young boy was infected with the disease in a rural village in Menhai County, Yunnan. The case of the deadly disease was reported in China last week before being confirmed on Sunday.
The child is in a stable condition after being infected with bubonic plague in the Chinese province.
Following the confirmed case, Chinese officials in the region announced a Level IV emergency response to avoid another pandemic following the devastating coronavirus outbreak.
Three dead plagues, plague rats, had previously been found in a village in Yunnan triggering a national screening program.
A rat infestation was announced in the village of Xiding in Menhai, according to the state-run Global Times
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 Death”
A case of the disease was reported in northern Inner Mongolia in China in August.
READ MORE: Chinese bubonic plague fears SOAR as cases reach highest percentage in decades
Seventeen provinces in Mongolia are currently reporting cases in July and August as infections continue to rise in the country and China.
Three cases of plague have been reported in the Mongolian province of Uvurgangai, as there are growing fears that it could spread across the border.
Dorje Narangerel, head of the public relations and monitoring department at the health ministry, said: “Three suspected cases of plague are in isolation at a local hospital.
“They are members of the same family or a mother and her two children.”
As bubonic plague is usually spread by wild rodents, there is a constant concern about the outbreak of the disease due to the mountainous regions of China and Mongolia.
Marmot hunting in Mongolia is illegal, but many locals view the rodent as a delicacy and disregard the law.
Three of the six confirmed cases in Mongolia have already died of the disease.
The latest was a 38-year-old man in Hovsgol province earlier this month.
Due to the growing cases of Mongolia and China, Russia has taken great 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 of Tuva and Altai.