What happens if a patient gets infected in between the first and second doses?

As the first dose is only 52% effective in protecting against COVID-19, it is very possible that those who have already received the first dose can become infected and ill with the virus that causes COVID-19 in the time between doses. Therefore, precautions - such as mask wearing, washing hands, avoiding large gatherings, maintaining social distance - should be taken even after the vaccine is administered.