Johnson County, Missouri, ramps up COVID-19 vaccine outreach Has one of the lowest vaccination rates in MO Health leaders work to get rural communities vaccinated as delta variant cases rise and last updated 2021-07-14 19:40:58-04 WARRENSBURG, Mo â Johnson County, Missouri, is seeing one of the lowest vaccination rates in the state. According to data at the Johnson County Community Health Services, about 21.7% of the county's residents are fully vaccinated and 24% have received their first dose. Community outreach coordinator, Kerri Lewis, would like to see that number much higher. âItâs a new vaccine and that's kind of been the battle all along,â Lewis said.