The University of Oxford confirmed that the Covid-19 vaccine it’s developing with AstraZeneca Plc produced strong immune responses in older adults in an early study, with key findings from the last phase of tests expected in the coming weeks.

The results, published Thursday in The Lancet medical journal, shed more light on preliminary data released in recent months showing the experimental shot generated an immune response in the elderly, who are at highest risk of severe illness.

“This is a very important step, because the big worry with any vaccine is that it doesn’t work so well in older people,” Richard Horton, The Lancet’s editor-in-chief, said in an interview with Bloomberg Television. The data is “another brick in the house that we’re trying to build for this vaccine.”

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