H58 knows its way around drugs. Normal typhoid fever responds well to antibiotics, but researchers say this 25-year-old strain doesn’t, and it’s quickly becoming the dominant form of the disease. Some 47 percent of samples collected over two decades were attributed to it. And while there are vaccines, they’re expensive and not often used in poorer countries. Scientists admit that multi-drug-resistant typhoid is here to stay, and they recommend better global tracking in order to contain it.