Source: China – South China Morning PostChina’s top respiratory disease expert Zhong Nanshan on Friday said the country could reach herd immunity against Covid-19 by the end of the year if more than 80 per cent of the population is fully vaccinated.He said while Covid-19 vaccines, including Chinese ones, were less effective six months after the first dose, herd immunity was still achievable with booster shots.“[At this stage] we believe a booster shot could strengthen the efficacy of the vaccines and we estimate more than 80 per cent…Read More