WASHINGTON: Moderna Inc said on Thursday its Covid-19 vaccine was about 93 per cent effective through six months after the second dose, showing hardly any change from the efficacy reported in its original clinical trial.However, the data does not include the vaccine’s performance against the more contagious Delta variant of the coronavirus, which has caused breakthrough infections among fully vaccinated people.Given the variant’s impact and expectations that antibody protection will eventually wane, the company said it expects booster shots will be needed this winter.Moderna, along with Pfizer and German partner BioNTech, which make a similar messenger RNA-based vaccine, have been advocating
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