Issues reported during Cerro Gordo Co. vaccination sign-up process Before the official opening of the online sign-up portal Monday morning, a message stating that all vaccine appointments were full greeted those who were trying to make an appointment. Posted: Feb 1, 2021 11:56 PM Updated: Feb 2, 2021 6:08 AM Posted By: Alex Jirgens MASON CITY, Iowa - Sign-up for the next group of Iowans who want a COVID-19 vaccine started in Cerro Gordo County on Monday. However, those who are 65 and older, healthcare providers, and those who needed a second dose of the vaccine were welcomed to the online sign-up portal were greeted with a 'all available COVID-19 vaccine appointments are full. Please await further announcements for upcoming appointments' message.