BANGKOK, Thailand (AFP) — Thailand on Tuesday defended mixing two different Covid-19 vaccines to battle a surge in infections, after the WHO’s top scientist warned it was a “dangerous trend” not backed by evidence. The kingdom is struggling to contain its latest outbreak fuelled by the highly contagious Delta variant, with cases and deaths skyrocketing and the healthcare system stretched thin. Authorities said they will mix a first dose of the Chinese-made Sinovac jab with […]