Biography of Anton Chekhov- What infectious disease had killed Anton at the age of fourty-four?

Weary of writing only humorous pieces, Chekhov began writing more serious articles and stories. But as his publishing career advanced, Chekhov realized he was suffering from tuberculosis, a contagious lung disease that had no real treatment at the time.

The writer kept his illness a secret from others for some time.

In 1896, Chekhov's tuberculosis became worse, and he took the first of many trips to warmer climates to aid his health. But in 1904, the infectious disease had killed the prolific writer, at the age of 44.

What infectious disease had killed Anton at the age of fourty-four?