Nation Source of carbon monoxide poisoning at Ohio hotel still unclear after 11 hospitalized January 30, 2022January 31, 2022 Holly Zachariah and Eric Lagatta, The Columbus Dispatch Comments Off on Source of carbon monoxide poisoning at Ohio hotel still unclear after 11 hospitalized Investigators were at the Hampton Inn in Marysville, Ohio, to find the source of a carbon monoxide poisoning that sent 11 people to the hospital.