SIOUX FALLS, S.D. (AP) — The head of one of the largest regional health systems in the Midwest was replaced Tuesday, less than a week after telling employees that he had recovered from COVID-19 and was not wearing a mask around the office. Sanford Health said in a release that it has “mutually agreed to part ways” with longtime CEO Kelby Krabbenhoft, who took over in 1996 and helped expand the organization from a community hospital into what is billed as the largest rural nonprofit health system in the country. Krabbenhoft left the executive position after telling employees in an email that he believes he’s now immune to COVID-19 for “at least seven months and perhaps years to come” and that he isn’t a threat to transmit it to anyone.Read more on NewsOK.com