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Healthy, boosted people unlikely to develop severe omicron infections, but jury’s out on older, at-risk populations

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Healthy individuals who have been vaccinated, and especially those who have been boosted, appear unlikely to develop severe infections from the omicron variant that would land them in the hospital, say medical experts who have monitored the effects of the newest coronavirus variant since it was identified over four weeks ago.

While omicron has sent U.S. infections soaring to levels not seen since last winter’s wave, it appears to have less severe effects than the delta variant, according to a handful of international studies and early data from several U.S. hospitals.

Those infected by the omicron variant are 15 to 20 percent less likely to go to an emergency room, and 40 percent less likely to be hospitalized overnight, compared with those infected with delta, according to English data analyzed by scientists from Imperial College London. That aligns with early U.S. data from some hospitals.

At the Houston Methodist hospital system, about 15 percent of symptomatic individuals have ended up hospitalized — around a 70 percent reduction compared with those infected by the delta variant, said James Musser, chair of pathology and genomic medicine.

A separate study from Britain, which is not yet peer reviewed, found that people infected with omicron were almost 60 percent less likely to enter the hospital than those infected with delta.

“What is absolutely clear is there is lower rate of hospitalization with our omicron patients in our hospital system,” Musser said. “That does not necessarily mean that this variant is quote-unquote ‘less virulent.’ The jury’s still out on that. What we know now is that … if you are immunized and, more importantly, if you are boosted, you’re going to stay out of substantial trouble.” ...

Other factors that might lead to greater risk include an individual’s age, the type of vaccine or booster they received, and whether they have underlying health problems, such as heart disease or obesity, said Michael Osterholm, director of the Center for Infectious Disease Research and Policy at the University of Minnesota and a member of President Biden’s covid-19 transition task force. ...

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