China steals march on West in developing nations' vaccine rollout

China is stealing a march on Western drugmakers in the Covid-19 vaccine race in developing nations, with Indonesia and Turkey rolling out huge campaigns with a Chinese shot this week, Brazil due to follow soon, and even EU member Hungary signing up.

Scientists in some Western countries say China has been too slow to publish trial data. Public reports so far about how well its vaccines work have been inconsistent, which the Chinese firms attribute to variations in methodology.