In recognition of World Health Day April 7, RTHK TV 31 will broadcast a new documentary,“Unseen Enemy” with the TV stations in a number of countries in early April. Part-taking countries & stations include: CNN in US and Canada, Arte in France and German, TVN in Poland, YES in Isreal, ETV2 in Estonia and DirectTV in Latin America. The broadcast dates of Hong Kong region is April 5 to 6(Wed and Thurs) at 9pm.