1. World Health Organization. The global burden of disease: 2004 update. Geneva: The Organization; 2008 [cited 2010 Aug 17]. http://www.who.int/healthinfo/global_burden_disease/GBD_report_2004update_full.pdf
2. Kandeel A, El-Shoubary W, Patel K, Dueger E, Yaacoup A, Safwat A, Sentinel surveillance for severe acute respiratory illness (SARI) in Egypt. Presented at: International Conference on Emerging Infectious Diseases; 2010 Jul 11–14; Atlanta, Georgia, USA. Abstract no. 99.
3. World Health Organization. Global alert and response (GAR). Update 47: studies of SARS virus survival, situation in China, May, 2003 [cited 2010 Aug 10]. http://www.who.int/csr/sars/archive/2003_05_05/en
4. Influenza in children.;Heikkinen;Acta Paediatr,2006
5. Estimating the impact of school closure on influenza transmission from sentinel data.;Cauchemez;Nature,2008