It’s true that TB is very deadly nowadays. So if you don’t treat it, kills up to 50 percent of people who actually have active tuberculosis, ” Gagneaux said.

的确，现在结核病非常致命。 因此，如果你不治疗它， 就会杀死多达 50% 的活动性结核病患者， ” Gagneaux 说。

Researchers are attempting to learn if tuberculosis bacteria were always harmful to humans. Scientists want to know why only five to 10 percent of the estimated two billion people infected with the bacteria actually come down with active tuberculosis.

研究人员正试图了解结核菌是否总是对人类有害。科学家们想知道为什么在估计感染这种细菌的 20 亿人中只有 5% 到 10% 实际上患上了活动性结核病。