Primary schools are ready to reopen for Primary Four to Six students on Monday after being inspected by health and education officials, but opinion is divided over the role of face masks. Lam Seung-wan, a principal and committee member of Hong Kong Aided School Heads' Association, said most primary schools would adhere to guidelines that all students and teachers should wear them. But he doubted their usefulness in preventing Sars. The Education and Manpower Bureau (EMB) will distribute 2,300,000 masks for primary and kindergarten children, ready for their return to school on May 19. Many international schools are more relaxed about wearing masks. A minority of students at Hong Kong International School wear them, according to a spokeswoman, and Art Enns, head of Christian Alliance PC Lau Memorial International School, said less than half his school community did. An EMB spokesman said the recommendation remained. 'We should not lower our guard,' he said.