A cyclosporiasis outbreak has spread to 31-34 US states with nearly 7,000 confirmed or suspected cases since May, the CDC reported this week. Michigan has borne the heaviest burden with over 3,300 cases, while outbreaks are also clustering in the Midwest, New York, and California. Health officials are still investigating the food source, with lettuce and salad greens identified as possible vectors, and retailers like Taco Bell have removed potentially contaminated ingredients as a precaution.