Bruce Aylward, an epidemiologist who led an advance team from the World Health Organization (WHO), speaks during a press conference of the China-WHO joint expert team in Beijing, capital of China, Feb. 24, 2020. China's unprecedented public health responses to the COVID-19 outbreak have yielded notable results in blocking human-to-human transmission of the virus, preventing or at least delaying hundreds of thousands of cases, said a joint expert team consisting of experts from China and the World Health Organization. The assessment was given at a press conference on Monday in Beijing after the 25-member team conducted a nine-day field study trip in China's Beijing, Guangdong, Sichuan and Hubei. (Xinhua/Xing Guangli)