The Centers for Disease Control and Prevention has identified about 5,800 cases of people who have been completely vaccinated against COVID-19 coronavirus disease, but have been infected anyway, CNN reported. Some became seriously ill and 74 people died, the CDC told CNN in an email. To date, no unexpected patterns have been identified in demographics or vaccine characteristics, the CDC said. It is not unexpected to have these cases of “discovery”, because vaccines are not 100% effective in preventing infections, which makes it important for people to continue to wear face masks and social distance, even after vaccination. The agency said it would look for clues as to who was most prone to infection, despite being vaccinated. “Infections detected by the vaccine have been reported among all people of all ages eligible for vaccination. However, just over 40% of infections have been in people aged 60 or older,” the CDC said.