We thank all the staff at the Faculty of Tropical Medicine, Mahidol University, who were a part of this research, and the registry department staff and ICU staff of Bamrasnaradura Infectious Diseases Institute for their cooperation with data collection. We thank the Edanz Group (https://en-author-services.edanzgroup.com/ac) for editing a draft of this manuscript.
Reechaipichitkul W, Thavornpitak Y, Sutra S. 2014. Burden of adult pneumonia in Thailand: a nationwide hospital admission data 2010. J Med Assoc Thail 97: 283–292.
Kobashi Y, Okimoto N, Matsushima T, Soejima R, 2001. Clinical analysis of community-acquired pneumonia in the elderly. Intern Med 40: 703–707.
Wattanathum A 2003. Community-acquired pneumonia in Southeast Asia: the microbial differences between ambulatory and hospitalized patients. Chest 123: 1512–1519.
Torres A, Peetermans WE, Viegi G, Blasi F, 2013. Risk factors for community-acquired pneumonia in adults in Europe: a literature review. Thorax 68: 1057–1065.
Ghia CJ, Dhar R, Koul PA, Rambhad G, Fletcher MA, 2019. Streptococcus pneumoniae as a cause of community-acquired pneumonia in Indian adolescents and adults: a systematic review and meta-analysis. Clin Med Insights Circ Respir Pulm Med 13: 1179548419862790. doi: 10.1177/1179548419862790 (eCollection 2019).
Lupisan S 2019. Etiology and epidemiology of community-acquired pneumonia in adults requiring hospital admission: a prospective study in rural Central Philippines. Int J Infect Dis 80: 46–53.
Hu HC, Huang CC, Tsai YH, Lee CH, Hsieh MJ, 2005. Outcome analysis of patients requiring mechanical ventilation with severe community-acquired pneumonia and identified bacterial pathogens. Chang Gung Med J 28: 229–236.
Mahendra M, Jayaraj BS, Limaye S, Chaya SK, Dhar R, Mahesh PA, 2018. Factors influencing severity of community-acquired pneumonia. Lung India 35: 284–289.
Wyrwich KW, Yu H, Sato R, Powers JH, 2015. Observational longitudinal study of symptom burden and time for recovery from community-acquired pneumonia reported by older adults surveyed nationwide using the CAP Burden of Illness Questionnaire. Patient Relat Outcome Meas 6: 215–223.
Jackson ML 2004. The burden of community-acquired pneumonia in seniors: results of a population-based study. Nephrol Dial Transplant 39: 1642–1650.
Prescott HC, Sjoding MW, Iwashyna TJ, 2014. Diagnoses of early and late readmissions after hospitalization for pneumonia. A systematic review. Ann Am Thorac Soc 11: 1091–1100.
Dang TT, Majumdar SR, Marrie TJ, Eurich DT, 2015. Recurrent pneumonia: a review with focus on clinical epidemiology and modifiable risk factors in elderly patients. Drugs Aging 32: 13–19.
Lim WS 2003. Defining community acquired pneumonia severity on presentation to hospital: an international derivation and validation study. Thorax 58: 377–382.
Charles PG 2008. SMART-COP: a tool for predicting the need for intensive respiratory or vasopressor support in community-acquired pneumonia. Nephrol Dial Transplant 47: 375–384.
Restrepo MI, Mortensen EM, Rello J, Brody J, Anzueto A, 2010. Late admission to the ICU in patients with community-acquired pneumonia is associated with higher mortality. Chest 137: 552–557.
Ehsanpoor B, Vahidi E, Seyedhosseini J, Jahanshir A, 2019. Validity of SMART-COP score in prognosis and severity of community acquired pneumonia in the emergency department. Am J Emerg Med 37: 1450–1454.
Fang W-F 2011. Application and comparison of scoring indices to predict outcomes in patients with healthcare-associated pneumonia. Crit Care 15: R32.
Davis JS, Cross GB, Charles PGP, Currie BJ, Anstey NM, Cheng AC, 2010. Pneumonia risk stratification in tropical Australia: does the SMART-COP score apply? Med J Aust 192: 133–136.
Lim WS, Macfarlane JT, 2001. A prospective comparison of nursing home acquired pneumonia with community acquired pneumonia. Eur Respir J 18: 362.
Kothe H, Bauer T, Marre R, Suttorp N, Welte T, Dalhoff K, 2008. Outcome of community-acquired pneumonia: influence of age, residence status and antimicrobial treatment. Eur Respir J 32: 139–146.
Torres OH 2004. Outcome predictors of pneumonia in elderly patients: importance of functional assessment. J Am Geriatr Soc 52: 1603–1609.
Lui G et al., 2009. Role of ‘atypical pathogens’ among adult hospitalized patients with community-acquired pneumonia. Respirology 14: 1098–1105.
Welte T, Torres A, Nathwani D, 2012. Clinical and economic burden of community-acquired pneumonia among adults in Europe. Thorax 67: 71–79.
Saldías Peñafiel F, O’Brien Solar A, Gederlini Gollerino A, Farías Gontupil G, Díaz Fuenzalida A, 2003. Community-acquired pneumonia requiring hospitalization in immunocompetent elderly patients: clinical features, prognostic factors and treatment. Arch Bronconeumol 39: 333–340.
Reechaipichitkul W, Lulitanond V, Tantiwong P, Saelee R, Pisprasert V, 2005. Etiologies and treatment outcomes in patients hospitalized with community-acquired pneumonia (CAP) at Srinagarind Hospital, Khon Kaen, Thailand. Southeast Asian J Trop Med Public Health 36: 156–161.
Brito V, Niederman MS, 2010. Predicting mortality in the elderly with community-acquired pneumonia: should we design a new car or set a new ‘speed limit’? 65: 944–945.
Koh SJ, Lee JH, 2015. Clinical characteristics of nursing home-acquired pneumonia in elderly patients admitted to a Korean teaching hospital. Korean J Intern Med 30: 638–647.
Ochoa-Gondar O 2011. Comparison of three predictive rules for assessing severity in elderly patients with CAP. Int J Clin Pract 65: 1165–1172.
Fernández-Sabé N 2003. Community-acquired pneumonia in very elderly patients: causative organisms, clinical characteristics, and outcomes. Medicine (Baltimore) 82: 159–169.