An antibody combination therapy has shown a statistically significant reduction in severe Covid-19 or death among patients with mild to moderate disease, the developer AstraZeneca Plc reported on 11 October. This follows the successful trial of a small molecule antiviral agent produced by Merck & Co Inc and Ridgeback Biotherapeutics LP for a similar patient population which was announced on 1 October. Using different agents, the two trials both achieved efficacy rates of 50% compared with placebo.
