People infected with Omicron were half as likely to be hospitalized, about 75 per cent less likely to need intensive care, and around 90 per cent less likely to die compared to those infected with the formerly dominant Delta variant, according to the paper.
The analysis was conducted on data from the Kaiser Permanente Southern California hospital system, which serves a population of around 4.7 million people, between Nov 30, 2021, and Jan 1, 2022, when both strains were circulating widely. "This study controlled for important key parameters such as age, sex, prior SARS-CoV-2 infection, prior vaccination and comorbidities," CDC director Rochelle Walensky told reporters on a briefing call Wednesday .
Dr Walensky warned that the results should not lead to complacency, since Omicron's extreme transmissibility is still stretching the United States' already over-extended health care system and its exhausted health workers.
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