Researchers have found a potentially deadly strain of tuberculosis infection spreading through Latino communities in Southern California and suspect the disease is being imported from Mexico in unpasteurized cheese. Health officials in Orange County, though, say they have not seen any cases of the rare strain of tuberculosis in at least five years. They credit a long-running campaign to educate people about the dangers of eating unlabeled cheese and other dairy products. Tuberculosis is an infection of the lungs that kills nearly 2 million people worldwide every year. The strain of tuberculosis that researchers found in San Diego County is...