Two cases of imported pneumonic plague in Beijing, China.

INTRODUCTION: Plague is an acute, often fulminating infectious disease caused by Yersinia Pestis transmitted by rodents. It is rarely encountered in clinics, although natural plague foci are widely distributed around the world. PATIENT CONCERNS: A couple who are cattle and sheep herdsmen from the Inner Mongolia Autonomous Region presented with cough, expectoration and fever. The husband developed sudden onset of fever and bloody sputum after working the soil on his farm. The wife also developed fever after nursing his husband. Both patients were preliminarily diagnosed with severe pneumonia, but antimicrobial treatments in the local hospital were unsuccessful. Their conditions deteriorated and they were transferred to our center. DIAGNOSIS: Preliminary etiological examinations were unremarkable, while blood and sputum specimens were found to be positive by RT-PCR and colloidal gold-immunochromatography assay targeting the F1 antigen and by reverse indirect hemagglutination assay. Pneumonic plague was confirmed. INTERVENTIONS: Both patients were transferred to special infectious disease hospital for further treatment. OUTCOMES: The condition of the female patient deteriorated. The male recovered after treatment, while the female patient finally died. CONCLUSION: There are 3 main forms of plague: bubonic, pneumonic and septicemic. Humans can be infected by the bites of bacterium-bearing fleas or direct contact of wild animals that died from plague. Human plague can be transmitted by close contact through coughing droplet. Neglected diagnosis of plague could cause severe consequences. Strict surveillance and protection measures should be taken and the public should be alerted about potential risks when epizootic plague is detected.