1 / 12Coronavirus is a global threat, with many countries still unable to control it. A possible second wave of corona infection is predicted to arrive in China.2 / 12China still faces the 'big challenge' of a potential second wave of Covid-19 infections, the country's top respiratory authority has warned, with the lack of immunity among the community a serious concern as the race to develop a vaccine continues3 / 12Dr. Zhong Nanshan, the Chinese government's senior medical adviser and the public face of the country's fight against Covid-19, also confirmed in an exclusive interview with CNN on Saturday.4 / 12He said that local authorities in Wuhan, the city where the novel coronavirus was first reported in December, had suppressed key details about the magnitude of the initial outbreak.5 / 12China has reported more than 82,000 coronavirus cases, with at least 4,633 deaths, according to data from the country's National Health Commission (NHC).6 / 12The number of new infections surged quickly in late January, prompting city lockdowns and nationwide travel bans.7 / 12By early February, China was reporting as many as 3,887 fresh cases a day. A month later, however, daily cases had dropped into the double digits.8 / 12While in the US, the number of daily infections skyrocketed, from 47 new cases on March 6 to 22,562 by the end of the month.9 / 12Having now largely contained the virus, life in China is slowly returning to normal. Lockdowns have eased and some schools and factories have reopened across the country.But Zhong said Chinese authorities should not be complacent, with the danger of a second wave of infections looming large.10 / 12Fresh clusters of coronavirus cases have emerged across China in recent weeks, in Wuhan as well as the northeastern provinces of Heilongjiang and Jilin.11 / 12'The majority of ... Chinese at the moment are still susceptible of the Covid-19 infection, because (of) a lack of immunity,' Zhong said. 'We are facing (a) big challenge, it's not better than the foreign countries I think at the moment.'12 / 12Zhong is known as the 'SARS hero' in China for combating the severe acute respiratory syndrome epidemic in 2003.