Omicron thrives in airways, not lungs; new data on asymptomatic cases

(Reuters) - The following is a summary of some recent studies on COVID-19. They include research that warrants further study to corroborate the findings and that has yet to be certified by peer review.

Omicron multiplies faster in airways, slower in lungs

Major differences in how efficiently Omicron and other variants of the coronavirus multiply may help predict Omicron's effects, researchers said on Wednesday.

Compared to the earlier Delta variant, Omicron multiplies itself 70 times more quickly in tissues that line airway passages, which may facilitate person-to-person spread, they said. But in lung tissues, Omicron replicates 10 times more slowly than the original version of the coronavirus, which might contribute to less-severe illness.

A formal report of the findings is under peer review for publication and has not been released by the research team. In a news release https://www.med.hku.hk/en/news/pr ess/20211215-omicron-sars-cov-2infection issued by Hong Kong University, study leader Dr. Michael Chan Chi-wai said, "It is important to note that the severity of disease in humans is not determined only by virus replication" but also by each person's immune response to the infection, which sometimes evolves into life-threatening inflammation.

Chan added, "By infecting many more people, a very infectious virus may cause more severe disease and death even though the virus itself may be less pathogenic. Therefore, taken together with our recent studies showing that the Omicron variant can partially escape immunity from vaccines and past infection, the overall threat from Omicron variant is likely to be very significant."

Omicron grips cells more tightly, withstands some antibodies

A structural model of how the Omicron variant attaches to cells and antibodies sheds light on its behavior and will help in designing neutralizing antibodies, according to researchers.

Using computer models of the spike protein on Omicron's surface, they analyzed molecular interactions occurring when the spike grabs onto a cell-surface protein called ACE2, the virus's gateway into the cell.

Metaphorically, the original virus had a handshake with ACE2, but Omicron's grip "looks more like a couple holding hands with their fingers entwined," said Joseph Lubin of Rutgers University in New Jersey. The "molecular anatomy" of the grip may assist in explaining how Omicron's mutations cooperate to help it infect cells, Lubin added.