There is a 'huge' possibility that Sars will reappear on the mainland in November. Zeng Guang, head of the country's Centre for Disease Control and Prevention, told the Shanghai Morning Post that the virus could reappear this year because 'infectious diseases do not disappear by themselves'. But he said the scale of a new outbreak would be 'nothing compared to this spring', as 'we now recognise the enemy and are capable of inflicting a quick defeat'. Professor Zeng leads a team of experts under the Ministry of Health that investigates epidemic diseases and is responsible for research into the Sars virus in Guangdong and Beijing. Other experts were less certain as to when a new outbreak could occur, if at all. But all agreed that if Sars did make a reappearance, it would be easier to control this time. Jin Shuigao, a disease analyst with the national Sars prevention team, said that virus was likely to come back, but the country was much better prepared to deal with it, both mentally and practically.