It’s possible to become infected with COVID-19 after vaccination. This can be due to the timing of the vaccination and infection. It typically takes a few weeks for the body to produce antibodies. So it’s possible that a person could be infected with COVID-19 just before or just after vaccination, and then get sick because the vaccine did not have enough time to provide protection. It’s important to note that no vaccines are 100% effective. There may be a small percentage of fully vaccinated people who still get sick with COVID-19, even after producing antibodies. However, evidence suggests that vaccination may make illness less severe.