1. Fleming DM. Influenza diagnosis and treatment: a view from clinical practice. Philos Trans R Soc Lond B Biol Sci 2001; 356(1416): 1933-43.

2. Longo DL. Harrison's principles of internal medicine. 20th ed. New York: McGraw-Hill; 2018.

3. Li H, Ma RC. Clinical analysis of 75 patients with severe influenza A H1N1 in Qinghai Province. Zhongguo wei zhong bing ji jiu yi xue= Chinese critical care medicine. Zhongguo Wei Zhong Bing Ji Jiu Yi Xue 2010; 22(3): 164-5.

4. Centers for Disease Control and Prevention (CDC. Hospitalized patients with novel influenza A (H1N1) virus infection-California, April-May, 2009. MMWR. Morb Mortal Wkly 2009; 58(19): 536-41.

5. Hauge SH, Dudman SG, Borgen K, Hungnes O, Brantsaeter A, Iversen B, et al. Disease caused by the new influenza A (H1N1) virus. Tidsskrift for den Norske laegeforening: Tidsskr Prakt Med, ny raekke 2009; 129(17): 1736-9.

6. Moghadami M, Kazeroni PA, Honarvar B, Ebrahimi M, Bakhtiari H, Akbarpour MA, et al. Influenza A (H1N1) virus pandemic in Fars province: a report from southern Iran, July-December 2009. Iran Red Crescent Med J 2010; 12 (3): 231-8.

7. Rahmanian V, Shakeri H, Bahonar A. Epidemiology of Influenza-like Syndrome: A Description of Cases Reported to the Influenza Care System in Jahrom.1394. Abstract book of The 26 th Iranian congress on infectious diseases and tropical medicine 2018. [in Persian]

8. Shayesteh M, Avar M, Jahani H, Bahlgardi F, Jahani H Epidemiologic status of human influenza cases in Qayyyat during years 2019-2018, Abstract book of The 27 th Iranian congress on infectious diseases and tropical medicine 2018. [in Persian]

9. Bijani B, Pahlevan AA, Qasemi-Barqi R, Sarokhani MR. Swine-Origin Influenza A (H1N1) and Seasonal Influenza in Qazvin Province, Iran: Comparison of Epidemiological Features, Clinical Manifestations and Outcome of the 2009 Pandemic. Biotech Health Sci 2015. [in Persian]

10. Nguyen-Van-Tam JS, Openshaw PJ, Hashim A, Gadd EM, Lim WS, Semple MG, et al. Risk factors for hospitalisation and poor outcome with pandemic A/H1N1 influenza: United Kingdom first wave (May–September 2009). Thorax 2010; 65(7): 645-51.

11. Champunot R, Tanjatham S, Kerdsin A, Puangpatra P, Wangsai S, Treebuphachatsakul P, et al. Impact of pandemic influenza (H1N1) virus-associated community-acquired pneumonia among adults in a tertiary hospital in Thailand. Jpn J Infect Dis 2010; 63(4): 251-6.

12. To KK, Wong SS, Li IW, Hung IF, Tse H, Woo PC, et al. Concurrent comparison of epidemiology, clinical presentation and outcome between adult patients suffering from the pandemic influenza A (H1N1) 2009 virus and the seasonal influenza A virus infection. Postgrad Med J 2010; 86(1019): 515-21.

13. Afzali H, Nematian M, Rajabi J, Soleimani Z, Momen-Heravi M, Salehi A, et al. Epidemiological survey of confirmed influenza A (H1N1) in Kashan, Aran and Bidgol cities during 2009-10. Feyz 2011; 15(3): 259-66. [in Persian]

14. Calitri C, Gabiano C, Garazzino S, Pinon M, Zoppo M, Cuozzo M, et al. Clinical features of hospitalised children with 2009 H1N1 influenza virusinfection. Eur J Pediatr 2010; 169(12): 1511-5.

15. Ugarte S, Arancibia F, Soto R. Influenza A pandemics: clinical and organizational aspects: the experience in Chile. Crit Care Med 2010; 38: e133-7.