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New gene tests for germs quickly reveal source of infections

In this March 15, 2019 photo, Brian Jetter poses for a portrait in La Jolla, Calif. In 2018 at 40, he was suddenly battling pneumonia and sepsis, and a slew of tests had failed to find the cause. But a high-tech genetic test was used to search his blood for bits of non-human genetic material from viruses, fungi and the like. It detected unusual bacteria that probably got into the Connecticut man's lungs when he choked and accidentally inhaled bits of a burger weeks earlier. (AP Photo/Marilynn Marchione)
In this March 15, 2019 photo, Brian Jetter poses for a portrait in La Jolla, Calif. In 2018 at 40, he was suddenly battling pneumonia and sepsis, and a slew of tests had failed to find the cause. But a high-tech genetic test was used to search his blood for bits of non-human genetic material from viruses, fungi and the like. It detected unusual bacteria that probably got into the Connecticut man's lungs when he choked and accidentally inhaled bits of a burger weeks earlier. (AP Photo/Marilynn Marchione) In this March 15, 2019 photo, Brian Jetter poses for a portrait in La Jolla, Calif. In 2018 at 40, he was suddenly battling pneumonia and sepsis, and a slew of tests had failed to find the cause. But a high-tech genetic test was used to search his blood for bits of non-human genetic material from viruses, fungi and the like. It detected unusual bacteria that probably got into the Connecticut man's lungs when he choked and accidentally inhaled bits of a burger weeks earlier. (AP Photo/Marilynn Marchione)

Brian Jetter was on life support, a healthy 40-year-old suddenly battling pneumonia and sepsis, and a slew of tests had failed to find the cause.

Mystery illnesses like this kill thousands of people each year when germs can’t be identified fast enough to reveal the right treatment. Now genetic tests are helping to solve these cases.

One finally was used to search Jetter’s blood for bits of non-human genetic material from viruses, fungi and the like. It detected unusual bacteria that probably got into the Connecticut man’s lungs when he choked and accidentally inhaled bits of a burger weeks earlier.

With the right medicine, he recovered and went home to his 5-year-old son.

“I realized how fragile life is,” Jetter said. “No matter how healthy you are, the smallest microbe can destroy you.”