More Contagious The second study found a second-generation form of omicron appears even more transmissible than the original.
It showed 39% of people infected with a the BA.2 subvariant were likely to infect others in their households, compared with 29% of those who were carrying the original version.
The study analyzed data gathered from 8,541 households in December and January in Denmark, where the new subvariant has become the dominant strain.
The risk of infection with either type was higher in those who were unvaccinated, underlining a positive effect of vaccination, the investigators said.