A little-known parasitic infection in the brain received a jolt of attention Wednesday when presidential candidate Robert F. Kennedy Jr. said he once suffered from it. The condition, known as neurocysticercosis, is a brain infection linked to larvae from pork tapeworms. It's rare: It hospitalizes roughly 1,000 to 2,000 people every year in the U.S. Neurocysticercosis causes seizures, headaches, blindness, blurred vision, dizziness, psychosis or memory loss. In some cases, it may even...