J&J’s vaccine shows promise against Delta variant
Company reports ‘neutralising activity’ against fast-spreading variant
Prospects for game-changing AstraZeneca vaccine become increasingly clouded
Diplomatic spat and last-minute efficacy questions add to uncertainty on jab’s approval
J&J launches first phase 3 trial of single-dose Covid-19 vaccine
Trial will recruit 60,000 across three continents
Q&A: How close are we to having a Covid-19 vaccine?
Scale of scientific endeavour is unprecedented with more than 145 candidates in development
J&J, Bavarian Nordic start clinical tests in Ebola vaccine race
Disease killed more than 8,000 people in west Africa since last year
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