Scientists in the U.S. and India have found an inexpensive treatment that could possibly save hundreds of thousands of newborns each year. And it turns out, the secret weapon was sitting in Asian kitchens all along: probiotic bacteria that are common in kimchi, pickles and other fermented vegetables. Feeding babies the microbes dramatically reduces the risk newborns will develop sepsis, scientists report ... in the journal Nature. Sepsis is a top killer of newborns worldwide. Each year more than 600,000 babies die of the blood infections. "All the sudden the baby stops being active. It stops crying and breastfeeding," says Dr. Pinaki Panigrahi, a pediatrician ... who led the study. For the past 20 years, Panigrahi has been working on a way to prevent sepsis. The tricky part, Panigrahi says, was figuring out the best strain of bacteria to protect against sepsis. "We screened more than 280 strains," Panigrahi says. "So it was a very methodical process." In the end, the one that seemed the most promising was a strain of lactobacillus plantarum. So Panigrahi and his team decided to move forward with a large-scale study. They were shocked by how well the bacteria worked. Babies who ate the microbes for a week ... had a dramatic reduction in their risk of death and sepsis. They dropped by 40 percent, from 9 percent to 5.4 percent. But that's not all. The probiotic also warded off several other types of infections, including those in the lungs. Respiratory infections dropped by about 30 percent. A course of the probiotic costs about $1 per baby.