Source: China – South China Morning PostSeveral cities with advanced vaccination programmes are vying to become the first in China to reach herd immunity.But questions remain about when exactly that tipping point – at which a population is largely protected from Covid-19 even though not everyone is immune – occurs. Experts say it cannot be calculated in a formula but rather must withstand the reality test.The World Health Organization, which supports achieving herd immunity through vaccination rather than by allowing the disease to…Read More