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Four other cases were reported in November, including two of pneumonic plague, a deadlier variant.

It followed four reported cases of plague in people there last November, including two of pneumonic plague, a deadlier variant.

Sunday’s warning follows four reported cases of plague in people from Inner Mongolia last November, including two of pneumonic plague, a deadlier variant of plague.

The cause was taken up by Wu Lien-teh, a Chinese doctor from British Malaya, who is often credited with saving many lives during the 1910 outbreak of pneumonic plague in northeastern China.

In 1910, when a contagious pneumonic plague was ravaging northeastern China, a physician there concluded that the disease traveled through the air.