Patients who had once tested positive for COVID-19 usually have enough antibodies after the first vaccine dose, The Wall Street Journal reported.

Scientists from the University of Maryland School of Medicine conducted an experiment with 59 health workers - 42 of them had recovered from COVID-19 developed more powerful immunity after the first vaccine than 17 people who have not yet had the infection.

According to scientists, those who recover from the first injection of the vaccine had the same amount of antibodies as those who did not test positive but received both vaccinations.