LONDON, United Kingdom (AFP) — Pharmaceutical giant AstraZeneca on Thursday announced that clinical trials of an antibody-based Covid-19 drug had shown robust efficacy and long-term prevention. The Anglo-Swedish laboratory follows in the footsteps of US firms Merck and Pfizer, which announced in October and early November respectively that they had developed drugs that could prevent severe forms of the disease, and that could be taken at the first sign of symptoms. The AstraZeneca drug AZD7442, […]