A new Omicron subvariant of the virus that causes COVID-19, BA.2, is quickly becoming the predominant source of infections amid rising cases around the world.
gained after COVID-19 infection may provide strong protection against reinfection from earlier variants, it weakens against Omicron.that has not yet been peer-reviewed of over 1 million individuals in Qatar suggests that two doses of either the Pfizer-BioNTech or Moderna COVID-19 vaccines protect against symptomatic infection from BA.1 and BA.
2 for several months before waning to around 10 percent.Importantly, both vaccines were 70 to 80 percent effective at preventing hospitalization or death, and this effectiveness increased to over 90 percent after a booster dose.The rise in BA.2 in certain parts of the world is most likely due to aCDC data suggests that BA.2 cases are rising steadily, making up
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