Getty Images The number of vaccination appointments will vary depending on the county's vaccine allocation next week. The state's largest county said some appointments for those under 65 with underlying conditions will be available at county hospitals and select Medicap pharmacies starting Monday. Polk County health officials say they will open COVID-19 vaccine appointments to those under 65 with underlying conditions starting next Monday. According to a press release on Thursday, appointments will be available at county hospitals and clinics along with select Medicap pharmacies. The number of appointments will vary depending on the county's vaccine allocation next week. State health officials expanded Iowa’s vaccine age eligibility requirements on Monday, saying the move was necessary for some counties who were struggling to fill appointments with people 65 and older.