Today, the more-infectious Omicron BA.5 subvariant is officially the dominant Covid strain in the U.S. Up until how, BA.5 has been tied to its sister Omicron subvariant, BA.4, as both had steadily …
After the original Omicron variant appeared on U.S. shores late last year and causedof the pandemic, a succession of Omicron subvariants have come and gone: BA.1.1, BA.2, BA.2.12.1 and now BA.4 and BA.5.
For example, BA.4 and BA.5 drove a substantial surge in South Africa recently that was not impacted by the county’s high level of immunity., those who have “hybrid immunity” from vaccination and a past infection are less able to ward off the BA.4 or BA.5 than they were previous strains. That’s because the vaccines we have now are targeting the spike proteins of previous strains. And the new variants have some very different mutations.
A more potent ability to reinfect also means that BA.5 has a larger pool of potential carriers. While other variants are limited by the protection afforded by inoculation, BA.5 can make its way back through populations who assume they’re more protected than they actually are. In Europe, Portugal is the country hardest hit by the new Omicron subvariants. It experienced a peak in cases on May 16,
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