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LOS ANGELES — Coronavirus cases are on the upswing worldwide, prompting some officials to warn that California could see increases this spring because of the omicron subvariant BA.2 even though cases so far have been modest. The World Health Organization has recorded the first week-over-week increase in global coronavirus cases since late January, with cases rising 8% compared with the ...

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To many parents' dismay, a new report from the US Centers for Disease Control and Prevention found that the Covid-19 vaccine is less effective against the Omicron variant for children ages 5 to 11 than for older children and adults. Two doses of the Pfizer/BioNTech vaccine reduced the risk of Omicron infection by 31% among children 5 to 11 years old, compared with 59% among those 12 to 15.

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