SIOUX CITY (KTIV) - We have been hearing about "breakthrough COVID infections" recently. Dr. Mike Kafka with UnityPoint Health-St. Luke's says a "breakthrough COVID infection" is when someone, who has been completely vaccinated, and has full immunity, picks up the virus from someone who is infected. Because the person is vaccinated, the infection isn't as severe, and probably won't require hospitalization. Kafka says because the Delta Variant of COVID-19 is much more contagious, doctors have found vaccinated people are contracting the virus, and can pass it on to others. Kafka says this does not change the recommendations to get vaccinated. In fact, he says it's a better reason to get vaccinated against COVID-19.