The Centers for Disease Control and Prevention has identified about 5,800 cases of people who were fully vaccinated against the coronavirus-borne illness COVID-19 but got infected anyway, CNN reported. Some became seriously ill and 74 people died, the CDC told CNN by email. “To date, no unexpected patterns have been identified in case demographics or vaccine characteristics,” the CDC said. It is not unexpected to have these “breakthrough” cases, as the vaccines are not 100% effective in preventing infections, making it important that people continue to wear face masks and socially distance, even after being vaccinated. The agency said it will be looking for clues about who is most prone to become infected despite having been vaccinated. “Vaccine breakthrough infections were reported among all people of all ages eligible for vaccination. However, a little over 40% of the infections were in people 60 or more years of age,” the CDC said.