Is China's vaccine success waning in Asia? © Reuters Indonesia has been mainly using Sinovac's vaccine in its Covid immunisation programme Across Asia, Chinese vaccines have played a crucial role in immunising people against Covid-19, with millions receiving either a Sinovac or Sinopharm jab. But in recent weeks, concerns have grown about their efficacy. Now, some Asian countries which made Chinese vaccines a key plank in their immunisation programmes have announced they will use other jabs. The move has raised questions, not only about whether China's vaccines can be trusted, but also abo...