The epidemic situation of human plague is generally divided into four levels: particularly serious plague epidemic (level I), major plague epidemic (level II), major plague epidemic (level III) and general plague epidemic (level IV).

The symptoms of plague are:

1, the incubation period of plague is short, generally between 1~6 days, mostly 2~3 days, and individual cases can reach 8~9 days. Among them, the incubation period of bubonic plague and epizootic plague is longer, about 2~8 days; The incubation period of primary pneumonic plague and septic plague is short, about 1~3 days.

2. The main manifestations of plague are acute onset, chills, fever, sudden rise of body temperature to 39 ~ 465438 0℃, persistent fever, severe headache, sometimes central vomiting, shortness of breath, tachycardia and blood pressure drop.

3. Blood pressure drops, unconsciousness, delirium, etc. May occur in early critical patients.

Grade ⅳ early warning of plague in Erenhot, Inner Mongolia;

On April 26th, it was learned from the Health and Health Committee of Erenhot City, Inner Mongolia Autonomous Region that/kloc-0 Daour Citellus was captured by the Center for Disease Control and Prevention of Erenhot City and tested positive. On April 26th, the local authorities issued a Class IV early warning of the plague epidemic.

It is understood that Erenhot CDC captured 1 Daour vole on 22nd at the east of road sign 14 km 100 m of G208 National Road. After indirect hemagglutination test, it was positive at the beginning of 23rd, and it was positive again at Xilin Gol League Regional Disease Center on 25th.