According to the World Health Organization (WHO), the Omikron variant is divided into three sub-variants, BA.1, BA.2 and BA.3. The UK Health Safety Agency (UKHSA) reported that Omikron BA.2 appears to have a much higher spread capacity than the currently dominant BA.1.
The BA.2 sub-variant of Omikron is even more contagious than its predecessor. Research shows that it can infect people those vaccinated against COVID-19. Scientists have assessed how high the risk of infection is for household members.
A study by the Danish Infectious Disease Control Agency (SSI) found that the BA.2 sub-variant Omikron is more contagious than its predecessor BA.1 and can more easily infect vaccinated people. Omikron BA.2 spreads faster and is more contagious.
A summary publication by SSI, the University of Copenhagen, the Danish State Statistics Office and the Technical University of Denmark, says “We have come to the conclusion that Omikron BA.2 is inherently more contagious than BA.1. It also has properties that reduce resistance to disease even in vaccinated people.” If you have been in contact with Omikron BA.2, there is a 39% chance of infection within seven days. With the BA.1, the probability of being infected is 29%, the study leader Frederik Plesner said.