by Joseph Schmid with Michelle Fitzpatrick in Frankfurt PARIS, France (AFP) — Already facing a daunting Covid vaccination challenge, French and German authorities are fighting to convince more people that a jab from the pharma giant AstraZeneca is just as effective as others. Stocks of the vaccines from the British-Swedish firm are going unused in both countries despite the desire to end a pandemic that has sparked a social and economic calamity on a scale […]