There were cases in Hawaii where people died from rat lungworm disease. Humans become infected by eating raw or undercooked infected snails or slugs, or by eating unwashed lettuce or other raw leafy vegetables contaminated by the slime of infected snails or slugs. The victims consumed unwashed lettuce which was infected by snail’s droppings. I never take any chances of having lettuce without thorough wash under running water. Don’t take any chances.