Covid cases are rising as omicron's 'stealth' subvariant spreads around the world
https://www.cnbc.com/2022/03/15/is-omicron-subvariant-bapoint2-to-blame-for-rising-covid-cases.html
Public health officials and scientists are closely monitoring BA.2, which has been described as a stealth variant because it has genetic mutations that could make it harder to distinguish from the delta variant using PCR tests, compared with the original omicron variant, BA.1
Now, Danish scientists believe that the BA.2 subvariant is 1½ times more transmissible than the original omicron strain, and is already overtaking it. The BA.2 variant is now responsible for over half of the new cases in Germany and makes up around 11% of cases in the U.S.
That number is expected to rise further, as it has in Europe.
Its clear that BA.2 is more transmissible than BA.1 and this, combined with the relaxation of mitigation measures and waning immunity, is contributing to the current surge in infections, Lawrence Young, a professor of molecular oncology at Warwick University, told CNBC on Monday.
The increased infectiousness of BA.2 is already out-competing and replacing BA.1, and we are likely to see similar waves of infection as other variants enter the population.
As long as the virus continues to spread and replicate, particularly in populations which are under-vaccinated or where vaccine-induced immunity is decaying, it will throw up new variants and these will remain a continual threat even to those countries with high rates of vaccination, Young noted. Living safely with Covid doesnt mean ignoring the virus and hoping it will go away forever.
What do we know about BA.2
Initial data show that BA.2 is a little more likely to cause infections in household contacts, when compared with BA.1. Its not believed currently that the BA.2 variant causes more severe illness or carries an increased the risk of being hospitalised, however further research is needed to confirm this, according to a U.K. parliamentary report published last week.
Hospitalizations have also risen in a number of European countries as Covid infections have risen in recent weeks, but deaths remain far lower than in previous peaks thanks to widespread vaccine coverage.The UKHSA has done a preliminary analysis comparing vaccine effectiveness against symptomatic disease for BA.1 and BA.2 infections and found that the levels of protection are similar, with efficacy of up to 77% soon after a booster shot, although this wanes over time.