Synopsis by Hal Erickson
In desperate need of quick cash, two men knowingly sell mutton infested with anthrax to the citizens of Walnut Grove. When most of the community falls ill, Charles (Michael Landon) and Jonathan (Merlin Olsen) head to Springfield for medical supplies. En route, they are held up by a man whose behavior suggests insanity -- but will they turn the man in or honor the pitiful pleas of his wife to let him go? Meanwhile, back in Walnut Grove, an ailing Laura (Melissa Gilbert) is struck blind -- perhaps permanently.