A city in northern China raised the alarm on Sunday after official media reported suspected bubonic plague.
Bayannur, Inner Mongolia Autonomous Region, has announced a level III warning of pest prevention and control, the state-run online newspaper Online reported.
The suspicion of bubonic plague was reported on Saturday by a hospital in Bayannur. The local health authority announced that the warning period will continue until the end of 2020.
"There is currently a danger of a plague epidemic spreading through this city. The public should improve their self-protection and skills and report abnormal health conditions immediately," said the local health agency.
On July 1, the state-run news agency Xinhua announced that two suspected cases of bubonic plague in Khovd province in western Mongolia have been confirmed by laboratory test results.
The confirmed cases are a 27-year-old resident and his 17-year-old brother, who is treated in two separate hospitals in their province, a health official quoted as saying.
The brothers ate marmot meat, the health official said, warning people not to eat marmot meat.
Narangerel said a total of 146 people who had contact with them were isolated and treated in local hospitals.
The bubonic plague is a bacterial disease that is transmitted by fleas that live on wild rodents like marmots. According to the World Health Organization (WHO), if it is not treated in time, it can kill an adult in less than 24 hours.
A couple died of bubonic plague last year in Bayan-Ulgii province, West Mongolia, after eating raw marmot meat.
News of bubonic plague came after Chinese researchers warned early about another possible pandemic caused by an influenza virus in pigs.
Scientists from the China Agricultural University, the Chinese Center for Disease Control and Prevention and other institutes discovered a swine flu virus with the genotype 4 (G4), which is contagious in pigs and has the possibility to jump on humans, like the G4 Virus can bind with human cells, the state-run Global Times reported last week.
The researchers fear that it could continue to mutate so that it could easily spread from person to person and trigger a global outbreak, the BBC reported.
"The fight against the prevalent G4 EA H1N1 virus in pigs and close monitoring in human populations, especially in the pig industry, should be implemented urgently," Chinese researchers warned in the paper.
The new diseases were reported when China faced COVID-19's second attack in Beijing after being checked in Wuhan, where it was first reported in December last year.
Beijing reported a single-digit COVID-19 on Saturday, local authorities said on Sunday.
The number of newly confirmed COVID-19 cases peaked on June 13th and 14th in Beijing and then went down generally, Xinhua quoted local officials.
From June 11 through July 4, the city reported 334 confirmed locally submitted cases, 47 percent of which are workers in the Xinfadi wholesale food market, the official said.