|Year : 2019 | Volume
| Issue : 1 | Page : 75-82
|Immunization status in chronic obstructive pulmonary disease: A multicenter study from Turkey
Tevfik Ozlu1, Yilmaz Bulbul1, Derya Aydin2, Dursun Tatar3, Tulin Kuyucu4, Fatma Erboy5, Handan Inonu Koseoglu6, Ceyda Anar3, Aysel Sunnetcioglu7, Pinar Yildiz Gulhan8, Unal Sahin9, Aydanur Ekici10, Serap Duru11, Sevinc Sarinc Ulasli12, Ercan Kurtipek13, Sibel Gunay14, RIMPACT Study Investigators15
1 Department of Chest Diseases, School of Medicine, Karadeniz Technical University, Trabzon, Turkey
2 Chest Disease Clinic, Pulmonary Diseases Hospital, Balikesir, Turkey
3 Department of Pulmonary Diseases, Dr. Suat Seren Pulmonary Diseases and Thoracic Surgery Education and Research Hospital, Izmir, Turkey
4 Department of Pulmonary Diseases, Sureyyapasa Pulmonary Diseases and Thoracic Surgery Education and Research Hospital, Istanbul, Turkey
5 Department of Chest Diseases, School of Medicine, Bulent Ecevit University, Zonguldak, Turkey
6 Department of Chest Diseases, School of Medicine, Gaziosmanpasa University, Tokat, Turkey
7 Department of Chest Diseases, School of Medicine, Yuzuncu Yil University, Van, Turkey
8 Chest Disease Clinic, Tosya State Hospital, Kastamonu, Turkey
9 Department of Chest Diseases, School of Medicine, Recep Tayyip Erdogan University, Rize, Turkey
10 Department of Chest Diseases, School of Medicine, Kırıkkale University, Kırıkkale, Turkey
11 Department of Pulmonary Diseases, Diskapi Yildirim Beyazid Education and Research Hospital, Ankara, Turkey
12 Department of Chest Diseases, School of Medicine, Hacettepe University, Ankara, Turkey
13 Department of Pulmonary Diseases, Konya Education and Research Hospital, Konya, Turkey
14 Chest Disease Clinic, Afyon State Hospital, Afyon, Turkey
|Date of Submission||13-May-2018|
|Date of Acceptance||21-Jul-2018|
|Date of Web Publication||10-Jan-2019|
Prof. Yilmaz Bulbul
Department of Chest Diseases, School of Medicine, Karadeniz Technical University, 61080 Trabzon
| Abstract|| |
OBJECTIVE: The purpose of this study is to detect the prevalence and the factors associated with influenza and pneumococcal vaccination and outcomes of vaccination during 2013–2014 season in patients with chronic obstructive pulmonary disease (COPD) in Turkey.
METHODS: This was a multicenter retrospective cohort study performed in 53 different centers in Turkey.
RESULTS: During the study period, 4968 patients were included. COPD was staged as GOLD 1-2-3-4 in 9.0%, 42.8%, 35.0%, and 13.2% of the patients, respectively. Influenza vaccination rate in the previous year was 37.9%; and pneumococcus vaccination rate, at least once during in a life time, was 13.3%. Patients with older age, higher level of education, more severe COPD, and comorbidities, ex-smokers, and patients residing in urban areas had higher rates of influenza vaccination. Multivariate logistic regression analysis showed that advanced age, higher education levels, presence of comorbidities, higher COPD stages, and exacerbation rates were associated with both influenza and pneumococcal vaccination. The number of annual physician/outpatient visits and hospitalizations due to COPD exacerbation was 2.73 ± 2.85 and 0.92 ± 1.58 per year, respectively. Patients with older age, lower education levels, more severe COPD, comorbid diseases, and lower body mass index and patients who are male and are residing in rural areas and vaccinated for influenza had significantly higher rates of COPD exacerbation.
CONCLUSIONS: The rates of influenza and pneumococcal vaccination in COPD patients were quite low, and the number of annual physician/outpatient visits and hospitalizations due to COPD exacerbation was high in Turkey. Advanced age, higher education levels, comorbidities, and higher COPD stages were associated with both influenza and pneumococcal vaccination.
Keywords: Chronic obstructive pulmonary disease, chronic obstructive pulmonary disease exacerbation, influenza vaccine, pneumococcal vaccine
|How to cite this article:|
Ozlu T, Bulbul Y, Aydin D, Tatar D, Kuyucu T, Erboy F, Koseoglu HI, Anar C, Sunnetcioglu A, Gulhan PY, Sahin U, Ekici A, Duru S, Ulasli SS, Kurtipek E, Gunay S, RIMPACT Study Investigators. Immunization status in chronic obstructive pulmonary disease: A multicenter study from Turkey. Ann Thorac Med 2019;14:75-82
|How to cite this URL:|
Ozlu T, Bulbul Y, Aydin D, Tatar D, Kuyucu T, Erboy F, Koseoglu HI, Anar C, Sunnetcioglu A, Gulhan PY, Sahin U, Ekici A, Duru S, Ulasli SS, Kurtipek E, Gunay S, RIMPACT Study Investigators. Immunization status in chronic obstructive pulmonary disease: A multicenter study from Turkey. Ann Thorac Med [serial online] 2019 [cited 2019 Mar 24];14:75-82. Available from: http://www.thoracicmedicine.org/text.asp?2019/14/1/75/249798
Chronic obstructive pulmonary disease (COPD) is highly prevalent illness, and the prevalence varies throughout the world. An overall COPD prevalence of 7.8%–19.7% is reported in adult population.,,,,,, Patients usually suffer from cough, sputum, dyspnea, and sometimes acute worsening of these symptoms, termed as COPD exacerbation, especially in winter season. Acute COPD exacerbations, which can lead to more frequent physician/hospital admissions, hospitalizations, life-threatening complications, and death, are mostly associated with tracheobronchial infections and air pollution. Acute exacerbations are more common in severe COPD cases, and those cases are reported to be referred to the hospital 1.5–2.5 times per year.
Of the infectious COPD exacerbations, 40%–60% are known to be related to bacterial infections and 30% are related to respiratory viral infections (rhinoviruses, influenza viruses, etc.). Influenza vaccination has been shown to reduce outpatient visits, hospitalizations, and mortality rates due to COPD exacerbations., Pneumococcal vaccine has also been shown to decrease pneumococcal pneumonia in COPD patients., In current practice, GOLD guidelines recommend influenza vaccination in all COPD patients to reduce serious illness. Similarly, conjugate and polysaccharide (PCV13 and PPSV23, respectively) pneumococcal vaccines are recommended for all COPD patients aged ≥65 years. PPSV is also recommended for younger patients (<65 years) with significant comorbid conditions including chronic heart or lung diseases.
The purpose of this study is to detect the prevalence and the factors associated with influenza and pneumococcal vaccination and outcomes of vaccination during 2013–2014 season in COPD patients in Turkey.
| Methods|| |
This multicenter retrospective cohort study was carried out in 53 different centers in Turkey between December 1, 2014, and January 31, 2015, following approval by the ethics committee.
During the study period, all patients (>40 years of age) who were admitted to these centers with at least 1 year history of COPD, diagnosed according to the GOLD criteria, and agreed to participate in the study were included. Demographic characteristics and patients symptoms were collected, and modified Medical Research Council (mMRC) dyspnea scale was filled for each patient by physicians using a standard questionnaire, which was completed by face-to-face interviews. Whether patients had influenza vaccination in the recent year (Have you been vaccinated for influenza in the last year?) and pneumococcal vaccination at least once in a lifetime (Have you ever received the pneumococcal vaccine?) were questioned. COPD exacerbation was defined as worsening of respiratory symptoms requiring a physician or a hospital visit or hospitalization (How many times have you been admitted to a physician or a hospital due to worsening of your respiratory symptoms?/How many times have you been hospitalized due to worsening of your respiratory symptoms?). Physician/hospital visits and/or hospitalizations due to COPD exacerbation were also recorded.
Data analysis was performed using SPSS software (version 13.01, SPSS Inc., Chicago, IL, USA). The Chi-square test was used to compare categorical variables. The Kolmogorov–Smirnov test was used to test for normal distribution of variables. The parametric student's t-test was used for comparing mean or median values of normally distributed data, and the nonparametric Mann–Whitney U-test was used to compare data that were not normally distributed. Factors that were potential contributors to vaccination (age, gender, education, smoking, body mass index, residential area, comorbidities, and COPD severity) were analyzed using logistic regression. Multivariate logistic regression analysis was used as a stepwise descending method from predictive factors with a significance <0.05 in the univariate analysis.
| Results|| |
A total of 5135 patients were collected from the study centers. However, after exclusion of 167 patients due to younger age (≤40 years), repeated records, and patients with missing data, 4968 patients were analyzed. Of all patients, 4196 were male (84.5%) and the mean age was a 66.5 ± 10.0 years (male: 66.6 ± 9.8, female: 66.1 ± 10.7). Other demographic characteristics are summarized in [Table 1].
|Table 1: Demographic characteristics of chronic obstructive pulmonary disease patients according to the influenza vaccination status|
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Influenza and pneumococcal vaccination rate
Overall rate of influenza vaccination was 37.9% (1885/4968, 95% confidence interval [CI]: 0.366–0.393) during 2013–2014 seasons. Vaccination rates were 41.4% (852/2060, 95% CI: 0.392–0.435) and 39.7% (324/816, 95% CI: 0.364–0.431) in COPD D and C and 36.0% (363/1009, 95% CI: 0.330–0.389) and 32.4% (343/1059, 95% CI: 0.296–0.352) in COPD B and A, respectively (P < 0.001). Patients with older age, higher education, more severe COPD, and comorbid diseases and also patients who are ex-smokers and residing in urban area had significantly higher rates of influenza vaccination [Table 1].
Overall rate of pneumococcal vaccination was 13.3% (659/4966, 95% CI: 0.123–0.142) at least once during in a life time. Similar to influenza, pneumococcal vaccination rates were also significantly higher in ex-smokers (15.1% vs. 9.1%, P < 0.001), patients with higher education (university: 29.8%, secondary/high school: 20.0%, elementary school: 11.3% vs. uneducated: 8.3%, P < 0.001), patients with comorbid diseases (15.4% vs. 10.4%, P < 0.001), and patients residing in urban area (15.1% vs. 8.8%, P < 0.001), except COPD severity (COPD D: 15.2%, COPD C: 12.3%, COPD B: 13.9%, and COPD A: 14.4%, P = 0.270). Furthermore, female patients had significantly higher rates of pneumococcal vaccination (16.0% vs. 12.8%, P = 0.017).
Multivariate logistic regression analysis showed that advanced age (odds ratio [OR]: 1.519, 95% CI: 1.327–1.738, P < 0.001 and OR: 1.309, 95% CI: 1.084–1.580, P = 0.005), higher education levels (OR: 4.217, 95% CI: 2.990–5.947, P < 0.001 and OR: 6.200, 95% CI: 4.033–9.533, P < 0.001), presence of comorbidities (OR: 1.207, 95% CI: 1.060–1.374, P = 0.004 and OR: 1.357, 95% CI: 1.126–1.635, P < 0.001), and higher COPD stages and exacerbation rates (OR: 1.175, 95% CI: 1.028–1.342, P = 0.018 and OR: 1.518, 95% CI: 1.263–1.824, P < 0.001) were found to be associated with both influenza and pneumococcal vaccination, respectively [Table 2]. Multivariate logistic regression analysis also showed female gender as a factor that contributing to (OR: 1.675, 95% CI: 1.288–2.178, P < 0.001) pneumococcal vaccination. On the contrary, active smoking was associated with lower influenza and pneumococcal vaccination rates (OR: 0.638, 95% CI: 0.501–0.813, P < 0.001 and OR: 0.679, 95%CI: 0.474–0.972, P = 0.034).
|Table 2: Multivariate logistic regression analysis of demographic parameters contributing influenza and pneumococcal vaccination|
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Among influenza-vaccinated patients, 86.3% (1627/1885, 95% CI: 0.846–0.877), 6.3% (119/1885, 95% CI: 0.053–0.075), and 7.3% (139/1885, 95% CI: 0.062–0.086) said that they had been vaccinated after the recommendation of their physicians, pharmacists, or others, respectively. In contrast, among the patients unvaccinated, 53.1% (1645/3026, 95% CI: 0.525–0.561) stated that their physician did not recommend vaccination, 12.6% (390/3026, 95% CI: 0.117–0.141) said that the vaccine was ineffective, and 34.3 (991/3026, 95% CI: 0.311–0.344) reported other reasons.
Annual chronic obstructive pulmonary disease exacerbation and hospitalization rates
Annual number of COPD exacerbation requiring physician/outpatient visit was 2.73 ± 2.85 times per year and requiring hospitalization was 0.92 ± 1.58 times per year. Patients with older age (>65), lower education levels, more severe COPD, comorbid diseases, and lower BMI and patients who are male and are residing in rural area and vaccinated for influenza had significantly higher rates of COPD exacerbation rates [Table 3].
|Table 3: The number of physician/policlinic visits and hospitalizations due to chronic obstructive pulmonary disease exacerbations per year|
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| Discussion|| |
In this study, we found that the overall prevalence of influenza vaccination among COPD patients during 2013–2014 season was 37.9% and pneumococcal vaccination at least once in a lifetime was 13.3%. A recent study which was performed in western cities of Turkey showed similar vaccination rates (36.5% for influenza and 14.1% for the pneumococcus). Influenza and pneumococcus vaccination rates were found to be unchanged during this 8-year period after a study which was performed in Eastern Black Sea Region of Turkey during 2006/2007 season, and in that previous study, vaccination rates were detected as 33.3% and 12.0%, respectively. Despite vaccine recommended groups are well defined and vaccines were reimbursed by Social Security Institution, vaccination rates remain low in Turkey. There are varying vaccination rates in COPD patients worldwide. In the PLATINO study which was conducted in 2003 in five different Latin American countries, influenza vaccination rate reported to be lower in Caracas (Venezuela) and higher in Santiago (Chile) as 5.1% and 52%, respectively. A study from Italy by Chiatti et al. showed that the influenza vaccination rate to be 30.5% during 2004/2005 season. One another study from Germany showed 46.5% of patients received influenza vaccine and 14.6% received pneumococcal vaccine during 2002/2003 season. On the other hand, higher influenza vaccination rates were reported from Norway (59%, during 2006/2007 season) and from France (73%, during 2010/2011 season)., More acceptable vaccination rates were reported from Spain in 2003 for influenza (84.2%) and for pneumococcus (65%). However, a recent study reported a small decrease in overall prevalence of influenza vaccination (62.7%) in Spain.
Patients with older age, higher level of education, more severe COPD, and comorbidities and patients who were ex-smokers and residing in urban areas had higher rates of influenza vaccination. Similarly, ex-smokers, patients with a higher level of education and comorbidities, patients residing in urban area, and also female patients had higher rates of pneumococcus vaccination. Similar to our results, the vaccination rates were found to be higher among the higher educational levels,,,,,, elder patients and those with concomitant disease,,, and were found to be lower among active smokers.,, Ariñez-Fernandez et al. also concluded that the most important determinants of pneumococcus vaccination are female gender, advanced age, and severity of COPD. In addition to the some demographical characteristics, vaccine recommendation by physician seems to be an important determinant of vaccination. We detected that, of the patients being vaccinated, 86.3% reported that they took into consideration of their physician's advice, while 53.1% of patients being unvaccinated reported that their physician gave no advice. Some studies also emphasize the importance of physicians' recommendation in vaccination rates., However, some other studies underline the role of patients not believing the effectiveness of vaccines.
Our study showed that the annual number of COPD exacerbations requiring physician/outpatient visits or hospitalizations (2.73 ± 2.85 and 0.92 ± 1.58, respectively) was higher than those previous studies., For example, in the TORCH and the UPLIFT studies, the annual rate of exacerbations was 0.85 and 0.73 in treatment groups and 1.13 and 0.85 in placebo groups, respectively., Our results also showed that patients with older age (>65), lower education levels, more severe COPD, comorbid diseases and lower BMI, patients who are male, and patients who are residing in rural area and vaccinated for influenza had significantly higher rates of COPD exacerbation. Although we did not investigate the role of prior exacerbations, analysis of the ECLIPSE study showed that the single best predictor of exacerbations, across all GOLD stages, was a past history of exacerbations. Consistent to our results, increasing age, severity of airflow limitation, prior asthma diagnosis, eosinophilia, and comorbid conditions were also previously confirmed to be predictors of frequent exacerbations.,,,, On the contrary, we showed that higher levels of education and residence in urban areas were found to be associated with reduced risk of exacerbation. The association between higher level of education and less exacerbation rate was not surprising as well as the residential area. We believe that the lower rates of exacerbations in residents of urban areas are mostly associated with more viable and comfortable living conditions and a higher quality of life. Thus, Suzuki et al. and Hurst et al. reported poorer quality of life to be associated with frequent exacerbations., On the other hand, we think that the higher rates COPD exacerbations in patients vaccinated for influenza might be associated with the tendency of vaccination among more severe COPD patients.
Our study has some limitations. Despite high number of study population, our data are mostly dependent on self-reporting of vaccination and exacerbation rates. The validity of self-reported vaccination status has not been assessed in Turkish population; however, some studies reported that self-reported vaccination status is adequate in Australian and American patients., On the other hand, especially recall of pneumococcal vaccination may be difficult since it is performed >5 years intervals (until this study, only polysaccharide type [PPSV23] was available). Similar to vaccination status, number of exacerbations and hospitalizations especially in frequent exacerbators might be difficult to remember.
| Conclusions|| |
Our results demonstrated that influenza and pneumococcal vaccination rates remained suboptimal during 2013–2014 season among COPD patients and the number of annual outpatient visits and hospitalizations due to COPD exacerbations was high in Turkey. Advanced age, higher education levels, presence of comorbidities, higher COPD stages, and exacerbation rates were associated with both influenza and pneumococcal vaccination.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
*RIMPACT Study Investigators
Okutan O1, Yildiz BP2, Cetinkaya PD3, Arslan S4, Cakmak G5, Cirak AK6, Sarioglu N7, Kocak ND8, Akturk UA8, Demir M9, Kilic T10, Dalli A11, Hezer H12, Altintas N13, Acat M14, Dagli CE15, Kargi A16, Yakar F17, Kirkil G18, Baccioglu A19, Gedik C20, Intepe YS21, Karadeniz G6, Onyilmaz T22, Saylan B23, Baslilar S23, Sariman N24, Ozkurt S25, Arinc S8, Kanbay A20, Yazar EE2, Yildirim Z26, Kadioglu EE27, Gul S2, Sengul A28, Berk S4, Dikis OS29, Kurt OK16, Arslan Y30, Erol S6, Korkmaz C31, Balaban A32, Toru Erbay U33, Sogukpinar O8, Uzaslan EK34, Babaoglu E12, Bahadir A2, Baris SA35, Ugurlu AO36, Ilgazli AH35, Fidan F37, Kararmaz E38, Guzel A39, Alzafer S40, Cortuk M14, Hocanli I41, Ortakoylu MG2, Erginel MS42, Yaman N43, Erbaycu AE6, Demir A6, Duman D8, Tanriverdi H44, Yavuz MY6, Sertogullarindan B45, Ozyurt S46, Bulcun E19, Yuce GD47, Sariaydin M48, Ayten O1, Bayraktaroglu M2, Tekgul S6, Erel F7, Senyigit A9, Kaya SB10, Ayik S11, Yazici O14, Akgedik A15, Yasar ZA16, Hayat E17, Kalpaklioglu F19, Sever F6, Sarac P22, Ugurlu E25, Kasapoglu US8, Gunluoglu G2, Demirci NY26, Bora M29, Talay F16, Ozkara B30, Yilmaz MU6, Yavsan DM31, Cetinoglu ED34, Balcan MB36, Ciftci T35, Havan A37, Gok A39, Nizam M2
1Haydarpasa Hospital of Gulhane Military Medical Academy Department of Chest Diseases, Istanbul, Pulmonary Diseases and Thoracic Surgery Education and Research Hospitals of 2Yedikule, Istanbul, 6Dr. Suat Seren, Izmir and 8Sureyyapasa, Istanbul, Education and Research Hospitals of 3Numune, Adana, 5Haseki, Istanbul, 12Ataturk, Ankara, 23Umraniye, Istanbul, 27Regional, Erzurum, 28Derince, Kocaeli, 29Sevket Yilmaz, Bursa, 32Evliya Celebi, Kutahya, 47Diskapi Yildirim Beyazid, Ankara. Departments of Chest Diseases School of Medicine 4Cumhuriyet University, Sivas, 7Balikesir University, Balikesir, 9Dicle University, Diyarbakir, 10Inonu University, Malatya, 11Katip Celebi University, Izmir, 13Namik Kemal University, Tekirdag, 14Karabuk University, Karabuk, 15Ordu University, Ordu, 16Abant Izzet Baysal University, Bolu, 17Bezmialem Vakıf University, Istanbul, 18Firat University, Elazig, 19Kirikkale University, Kirikkale, 20Medeniyet University, Istanbul, 21Bozok University, Yozgat, 24Maltepe University, Istanbul, 25Pamukkale University, Denizli, 26Gazi University, Ankara, 31Necmettin Erbakan University, Konya, 33Dumlupinar University, Kutahya, 34Uludag University, Bursa, 35Kocaeli University, Kocaeli, 37Fatih University, Istanbul, 39Ondokuz Mayıs University, Samsun, 40Acibadem University Bakirköy Hospital, Istanbul. 42Osmangazi University, Eskisehir, 44Bulent Ecevit University, Zonguldak, 45Yuzuncü Yil University, Van, 46Recep Tayyip Erdogan University, Rize, 48Kocatepe University, Afyon, State Hospitals of 22Mardin, Mardin, 38Toros, Adana, 41Sirnak, Sirnak. 30Etimesgut Military Hospital, Ankara, 36Baskent University Istanbul Hospital, Istanbul, 43Pulmonary Diseases Hospital, Balikesir, Turkey
| References|| |
Mannino DM, Homa DM, Akinbami LJ, Ford ES, Redd SC. Chronic obstructive pulmonary disease surveillance – United states, 1971-2000. MMWR Surveill Summ 2002;51:1-6.
Menezes AM, Perez-Padilla R, Jardim JR, Muiño A, Lopez MV, Valdivia G, et al.
Chronic obstructive pulmonary disease in five Latin American cities (the PLATINO study): A prevalence study. Lancet 2005;366:1875-81.
de Marco R, Accordini S, Cerveri I, Corsico A, Sunyer J, Neukirch F, et al.
An international survey of chronic obstructive pulmonary disease in young adults according to GOLD stages. Thorax 2004;59:120-5.
Tzanakis N, Anagnostopoulou U, Filaditaki V, Christaki P, Siafakas N; COPD group of the Hellenic Thoracic Society, et al.
Prevalence of COPD in greece. Chest 2004;125:892-900.
Peña VS, Miravitlles M, Gabriel R, Jiménez-Ruiz CA, Villasante C, Masa JF, et al.
Geographic variations in prevalence and underdiagnosis of COPD: Results of the IBERPOC multicentre epidemiological study. Chest 2000;118:981-9.
Buist AS, Vollmer WM, McBurnie MA. Worldwide burden of COPD in high- and low-income countries. Part I. The burden of obstructive lung disease (BOLD) initiative. Int J Tuberc Lung Dis 2008;12:703-8.
Baykal Y. An epidemiological investigation on chronic obstructive pulmonary disease. Tuberk Toraks 1976;24:3-18.
Acıcan T, Gulbay BE. Acute exacerbation of chronic obstructive pulmonary disease (COPD). Turk Klin J Surg Med Sci 2006;2:40-4.
MacNee W. Acute exacerbations of COPD. Swiss Med Wkly 2003;133:247-57.
Sethi S. Infectious etiology of acute exacerbations of chronic bronchitis. Chest 2000;117:380S-5S.
Nichol KL, Baken L, Nelson A. Relation between influenza vaccination and outpatient visits, hospitalization, and mortality in elderly persons with chronic lung disease. Ann Intern Med 1999;130:397-403.
Poole PJ, Chacko E, Wood-Baker RW, Cates CJ. Influenza vaccine for patients with chronic obstructive pulmonary disease. Cochrane Database Syst Rev 2006;1:CD002733.
Alfageme I, Vazquez R, Reyes N, Muñoz J, Fernández A, Hernandez M, et al.
Clinical efficacy of anti-pneumococcal vaccination in patients with COPD. Thorax 2006;61:189-95.
Walters JA, Tang JN, Poole P, Wood-Baker R. Pneumococcal vaccines for preventing pneumonia in chronic obstructive pulmonary disease. Cochrane Database Syst Rev 2017;1:CD001390.
Global Strategy for the Diagnosis, Management, and Prevention of Chronic Obstructive Pulmonary Disease. Global Initiative for Chronic Obstructive Lung Disease (GOLD); 2017.
Aka Aktürk Ü, Görek Dilektaşlı A, Şengül A, Musaffa Salepçi B, Oktay N, Düger M, et al.
Influenza and pneumonia vaccination rates and factors affecting vaccination among patients with chronic obstructive pulmonary disease. Balkan Med J 2017;34:206-11.
Bülbül Y, Öztuna F, Gülsoy A, Özlü T. Chronic obstructive pulmonary disease in Eastern black sea region: Characteristics of the disease and the frequency of influenza-pneumococcal vaccination. Turk Klin J Med Sci 2010;30:24-9.
López Varela MV, Muiño A, Pérez Padilla R, Jardim JR, Tálamo C, Montes de Oca M, et al.
Treatment of chronic obstructive pulmonary disease in 5 Latin American cities: The PLATINO study. Arch Bronconeumol 2008;44:58-64.
Chiatti C, Barbadoro P, Marigliano A, Ricciardi A, Di Stanislao F, Prospero E, et al.
Determinants of influenza vaccination among the adult and older Italian population with chronic obstructive pulmonary disease: A secondary analysis of the multipurpose ISTAT survey on health and health care use. Hum Vaccin 2011;7:1021-5.
Schoefer Y, Schaberg T, Raspe H, Schaefer T. Determinants of influenza and pneumococcal vaccination in patients with chronic lung diseases. J Infect 2007;55:347-52.
Eagan TM, Hardie JA, Jul-Larsen Å, Grydeland TB, Bakke PS, Cox RJ, et al.
Self-reported influenza vaccination and protective serum antibody titers in a cohort of COPD patients. Respir Med 2016;115:53-9.
Vandenbos F, Gal J, Radicchi B. Vaccination coverage against influenza and pneumococcus for patients admitted to a pulmonary care service. Rev Mal Respir 2013;30:746-51.
Jiménez-García R, Ariñez-Fernandez MC, Hernández-Barrera V, Garcia-Carballo MM, de Miguel AG, Carrasco-Garrido P, et al.
Compliance with influenza and pneumococcal vaccination among patients with chronic obstructive pulmonary disease consulting their medical practitioners in Catalonia, Spain. J Infect 2007;54:65-74.
Garrastazu R, García-Rivero JL, Ruiz M, Helguera JM, Arenal S, Bonnardeux C, et al.
Prevalence of influenza vaccination in chronic obstructive pulmonary disease patients and impact on the risk of severe exacerbations. Arch Bronconeumol 2016;52:88-95.
Lu PJ, Singleton JA, Rangel MC, Wortley PM, Bridges CB. Influenza vaccination trends among adults 65 years or older in the United States, 1989-2002. Arch Intern Med 2005;165:1849-56.
Jiménez-García R, Hernández-Barrera V, Carrasco-Garrido P, de Andrés AL, de Miguel Diez J, de Miguel AG, et al.
Coverage and predictors of adherence to influenza vaccination among Spanish children and adults with asthma. Infection 2010;38:52-7.
Santaularia J, Hou W, Perveen G, Welsh E, Faseru B. Prevalence of influenza vaccination and its association with health conditions and risk factors among Kansas adults in 2013: A cross-sectional study. BMC Public Health 2016;16:185.
Ariñez-Fernandez MC, Carrasco-Garrido P, Garcia-Carballo M, Hernández-Barrera V, de Miguel AG, Jiménez-García R, et al.
Determinants of pneumococcal vaccination among patients with chronic obstructive pulmonary disease in Spain. Hum Vaccin 2006;2:99-104.
Ciblak MA; Grip Platformu. Influenza vaccination in Turkey: Prevalence of risk groups, current vaccination status, factors influencing vaccine uptake and steps taken to increase vaccination rate. Vaccine 2013;31:518-23.
Calverley PM, Anderson JA, Celli B, Ferguson GT, Jenkins C, Jones PW, et al.
Salmeterol and fluticasone propionate and survival in chronic obstructive pulmonary disease. N Engl J Med 2007;356:775-89.
Tashkin DP, Celli B, Senn S, Burkhart D, Kesten S, Menjoge S, et al.
A 4-year trial of tiotropium in chronic obstructive pulmonary disease. N Engl J Med 2008;359:1543-54.
Hurst JR, Donaldson GC, Quint JK, Goldring JJ, Baghai-Ravary R, Wedzicha JA, et al.
Temporal clustering of exacerbations in chronic obstructive pulmonary disease. Am J Respir Crit Care Med 2009;179:369-74.
Suzuki M, Makita H, Ito YM, Nagai K, Konno S, Nishimura M, et al.
Clinical features and determinants of COPD exacerbation in the Hokkaido COPD cohort study. Eur Respir J 2014;43:1289-97.
Hurst JR, Vestbo J, Anzueto A, Locantore N, Müllerova H, Tal-Singer R, et al.
Susceptibility to exacerbation in chronic obstructive pulmonary disease. N Engl J Med 2010;363:1128-38.
Montes de Oca M, Tálamo C, Halbert RJ, Perez-Padilla R, Lopez MV, Muiño A, et al.
Frequency of self-reported COPD exacerbation and airflow obstruction in five Latin American cities: The Proyecto Latinoamericano de Investigacion en Obstruccion Pulmonar (PLATINO) study. Chest 2009;136:71-8.
Husebø GR, Bakke PS, Aanerud M, Hardie JA, Ueland T, Grønseth R, et al.
Predictors of exacerbations in chronic obstructive pulmonary disease – Results from the Bergen COPD cohort study. PLoS One 2014;9:e109721.
Kerkhof M, Freeman D, Jones R, Chisholm A, Price DB; Respiratory Effectiveness Group, et al.
Predicting frequent COPD exacerbations using primary care data. Int J Chron Obstruct Pulmon Dis 2015;10:2439-50.
Skull SA, Andrews RM, Byrnes GB, Kelly HA, Nolan TM, Brown GV, et al.
Validity of self-reported influenza and pneumococcal vaccination status among a cohort of hospitalized elderly inpatients. Vaccine 2007;25:4775-83.
Irving SA, Donahue JG, Shay DK, Ellis-Coyle TL, Belongia EA. Evaluation of self-reported and registry-based influenza vaccination status in a Wisconsin cohort. Vaccine 2009;27:6546-9.
[Table 1], [Table 2], [Table 3]