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Concept: Prevalence


Timely assessment of the burden of HIV/AIDS is essential for policy setting and programme evaluation. In this report from the Global Burden of Disease Study 2015 (GBD 2015), we provide national estimates of levels and trends of HIV/AIDS incidence, prevalence, coverage of antiretroviral therapy (ART), and mortality for 195 countries and territories from 1980 to 2015.

Concepts: Antiretroviral drug, HIV, AIDS, Protease inhibitor, Epidemiology, Medical statistics, Evaluation, Prevalence


A thyroid ultrasound examination programme has been conducted in Fukushima Prefecture, Japan, after the nuclear disaster in 2011. Although remarkably high prevalence of thyroid cancer was observed, no relevant quantitative evaluation was conducted. We calculated the observed/expected (O/E) ratio of thyroid cancer prevalence for the residents aged ≤20 years. Observed prevalence was the number of thyroid cancer cases detected by the programme through the end of April 2015. Expected prevalence was calculated as cumulative incidence by a life-table method using the national estimates of thyroid cancer incidence rate in 2001-10 (prior to the disaster) and the population of Fukushima Prefecture. The underlying assumption was that there was neither nuclear accident nor screening intervention. The observed and estimated prevalence of thyroid cancer among residents aged ≤20 years was 160.1 and 5.2, respectively, giving an O/E ratio of 30.8 [95% confidence interval (CI): 26.2, 35.9]. When the recent increasing trend in thyroid cancer was considered, the overall O/E ratio was 22.2 (95% CI: 18.9, 25.9). The cumulative number of thyroid cancer deaths in Fukushima Prefecture, estimated with the same method (annual average in 2009-13), was 0.6 under age 40. Combined with the existing knowledge about radiation effect on thyroid cancer, our descriptive analysis suggests the possibility of overdiagnosis. Evaluation including individual-level analysis is required to further clarify the contribution of underlying factors.

Concepts: Epidemiology, Medical statistics, Chernobyl disaster, Incidence, Prevalence, Denominator data, Fukushima Prefecture, Tōhoku region


Behcet’s disease is a multisystem autoimmune disease with variable clinial manifestations. The diagnosis may pose a difficult challenge for the clinician, who has to be familiar with the wide spectrum and combination of the symptoms of Behcet’s disease. It is considered a rare disease in Hungary, and there are only few reports on Behcet’s disease in the Hungarian literature. However, the past history of Hungary, the worldwide growing incidence of the disease, and the authors' experience raise the possibility that the occurrence of the disease is higher than previously thought. In this review the authors present and discuss literature data on the pathogenesis and pathomechanism, as well as their own experience concerning the symptomatology of Behcet’s disease in order to promote diagnosis and offer adequate therapy for the patients. The authors presume that the importance of the disease is underestimated in Hungary due to a considerable number of unrecognized cases and they propose to establish a national registry for Behcets disease. Orv. Hetil., 2013, 154, 93-101.

Concepts: Epidemiology, Medical terms, Autoimmune diseases, Prevalence, Hungary, Behçet's disease, Hungarian language, Kingdom of Hungary


The prevalence of foodborne trematode (FBT) metacercariae was investigated in fish from 2 localities of northern Vietnam in 2004-2005. Freshwater fish (9 species) were collected from local markets in Hanoi City (n=76) and Nam Dinh Province (n=79), and were examined for FBT metacercariae using the artificial digestion technique. Adult flukes were obtained from hamsters experimentally infected with the metacercariae at day 8 post-infection. Three (Haplorchis pumilio, Centrocestus formosanus, and Procerovum varium) and 6 (Haplorchis taichui, H. pumilio, C. formosanus, P. varium, Stellantchasmus falcatus, and Heterophyopsis continua) species of FBT metacercariae were detected in the 2 regions, respectively. Overall, among the positive fish species, H. pumilio metacercariae were detected in 104 (80.0%) of 130 fish examined (metacercarial density per infected fish; 64.2). C. formosanus metacercariae were found in 37 (40.2%) of 92 fish (metacercarial density; 14.7). P. varium metacercariae were detected in 19 (63.3%) of 30 fish (Anabas testudineus and Mugil cephalus) (metacercarial density; 247.7). S. falcatus metacercariae were found in all 10 M. cephalus examined (metacercarial density; 84.4). H. continua metacercariae (2 in number) were detected in 1 fish of Coilia lindmani. Morphologic characteristics of the FBT metacercariae and their experimentally obtained adults were described. The results have demonstrated that various FBT species are prevalent in northen parts of Vietnam.

Concepts: Prevalence, Anabas testudineus, Freshwater fish, Vietnam, Hanoi, Nam Dinh Province, Red River Delta, Ngo Dinh Diem


A high incidence of orofacial clefts is reported in China, but no data has shown the relation between cleft types and the incidence of other defects so far. The aim of this study is to assess the incidence of congenital heart diseases and other organic defects associated with different types of orofacial clefts.

Concepts: Epidemiology, Genetic disorder, Diseases and disorders, Heart, Heart disease, Congenital heart disease, Prevalence


Aim. To estimate and compare asthma prevalence in Africa in 1990, 2000, and 2010 in order to provide information that will help inform the planning of the public health response to the disease. Methods. We conducted a systematic search of Medline, EMBASE, and Global Health for studies on asthma published between 1990 and 2012. We included cross-sectional population based studies providing numerical estimates on the prevalence of asthma. We calculated weighted mean prevalence and applied an epidemiological model linking age with the prevalence of asthma. The UN population figures for Africa for 1990, 2000, and 2010 were used to estimate the cases of asthma, each for the respective year. Results. Our search returned 790 studies. We retained 45 studies that met our selection criteria. In Africa in 1990, we estimated 34.1 million asthma cases (12.1%; 95% confidence interval [CI] 7.2-16.9) among children <15 years, 64.9 million (11.8%; 95% CI 7.9-15.8) among people aged <45 years, and 74.4 million (11.7%; 95% CI 8.2-15.3) in the total population. In 2000, we estimated 41.3 million cases (12.9%; 95% CI 8.7-17.0) among children <15 years, 82.4 million (12.5%; 95% CI 5.9-19.1) among people aged <45 years, and 94.8 million (12.0%; 95% CI 5.0-18.8) in the total population. This increased to 49.7 million (13.9%; 95% CI 9.6-18.3) among children <15 years, 102.9 million (13.8%; 95% CI 6.2-21.4) among people aged <45 years, and 119.3 million (12.8%; 95% CI 8.2-17.1) in the total population in 2010. There were no significant differences between asthma prevalence in studies which ascertained cases by written and video questionnaires. Crude prevalences of asthma were, however, consistently higher among urban than rural dwellers. Conclusion. Our findings suggest an increasing prevalence of asthma in Africa over the past two decades. Due to the paucity of data, we believe that the true prevalence of asthma may still be under-estimated. There is a need for national governments in Africa to consider the implications of this increasing disease burden and to investigate the relative importance of underlying risk factors such as rising urbanization and population aging in their policy and health planning responses to this challenge.

Concepts: Public health, Epidemiology, Statistics, Asthma, Demography, Population, Aging, Prevalence


INTRODUCTION Dyscalcemia is associated with adverse cardiovascular effects. Therapy of heart failure (HF) may change serum calcium by reduction of urinary wasting or increased calcium apposition to bones.  OBJECTIVES Our objectives were to assess the prevalence of dyscalcemia in patients with newly up-titrated HF therapy, to explore clinical and laboratory determinants of abnormal serum calcium levels and to analyze the relation of dyscalcemia to prognosis. PATIENTS AND METHODS In 722 HF patients (age 53 ± 10 years, 13% female, NYHA class III-IV) naïve to HF drugs, we have assessed crude prevalence of serum dyscalcemia and adjusted risk of calcium abnormalities on top of recommended therapy and analysed the association of calcium abnormalities with mortality at 2 years of follow-up. RESULTS During therapy up-titration NYHA class improved in 66.7% patients, in 31.0% did not change and worsened in 2.4%. Hypocalcemia occurred in 166 (23.0%) patients and was more prevalent in patients who became less symptomatic on target HF therapy. ypercalcemia was diagnosed in 63 (8.7%) patients and predominated in those who did not respond to treatment. These findings were independent of kidney function, BMI, HF ethiology, thiazides use, age and sex. Hypercalcemia was associated with more catabolic profile, hemodynamic compromise, inflammation and lower bone mineral density. Lower albumin, higher serum phosphorus, were independently of kidney function significant predictors of hypercalcemia.  Hypocalcemia was associated with less catabolism, higher albumin, lower phosphorus, treatment of thiazides, smoking history. Neither hypocalcemia nor hypercalcemia affected prognosis.  CONCLUSIONS We concluded that serum dyscalcemia is related to response to HF therapy and HF severity on top of treatment. Mild hypocalcemia is associated with clinical improvement and does not worsen HF outcome. Hypercalcemia occurs more frequently in non-responders to therapy, its clinical significance requires further studies.  

Concepts: Kidney, Bone, Vitamin D, Medical statistics, Calcium, Urinary system, Prevalence, Calcium metabolism


With a lifetime prevalence of 16.2%, major depressive disorder is the fifth biggest contributor to the disease burden in the United States.

Concepts: Disease, United States, Major depressive disorder, Prevalence, Dysthymia, Disease burden


This study examined the association of breakfast consumption, and the type of breakfast consumed, with body mass index (BMI; kg/m(2)) and prevalence rates and odds ratios (OR) of overweight/obesity among Canadian adults. These associations were examined by age group and sex.

Concepts: AIDS, Mass, Body mass index, Odds ratio, The Association, Prevalence


Up-to-date evidence about levels and trends in disease and injury incidence, prevalence, and years lived with disability (YLDs) is an essential input into global, regional, and national health policies. In the Global Burden of Disease Study 2013 (GBD 2013), we estimated these quantities for acute and chronic diseases and injuries for 188 countries between 1990 and 2013.

Concepts: Medicine, Epidemiology, Medical terms, Prevalence