Did you give your children an additional tetanus shot? Right now, the …

Did you give your children an additional tetanus shot? Right now, the nurse is calling and says to come in for a vaccination tomorrow, even though we already got vaccinated. She explains that there's a tetanus outbreak right now and everyone needs to get vaccinated from 6-11 months old and then from 2-4 years old and again at 6 years old. I honestly don't know what to do, it all seems strange to me, especially since we were vaccinated and haven't been sick with anything for a long time.