Interested individuals can make an appointment online. Written By: News Staff | × Otter Tail County Public Health has COVID-19 vaccine appointments open for April 14-16 in Fergus Falls, Perham and New York Mills. An appointment is required. Public Health will be using the Moderna COVID-19 vaccine. The Moderna vaccine requires a second dose 28 days after the first one. You will be asked to make your second appointment after you receive your first dose. The vaccine is open to all 18 years old and older. The vaccine is free of charge. The clinic schedules are as follows: April 14: Bigwood Event Center, 925 Western Ave. Fergus Falls, 9 a.m.-3 p.m.