Greece’s health ministry on Monday afternoon opened an online platform for citizens to book a fourth booster shot against the Covid-19 virus.

The first such vaccinations for eligible individuals are set for Sept. 14.

According to public health officials, the updated vaccinations – by Pfizer-Biontech and Moderna – are based on the m-RNA technology and are effective against the variants Omicron 1, 2, 2.7 and 5.