Changes in movement patterns in relation to sun conditions and spatial scales in wild western gorillas.

For most primates living in tropical forests, food resources occur in patchworks of different habitats that vary seasonally in quality and quantity. Efficient navigation (i.e., spatial memory-based orientation) towards profitable food patches should enhance their foraging success. The mechanisms underpinning primate navigating ability remain nonetheless mostly unknown. Using GPS long-term tracking (596 days) of one group of wild western lowland gorillas (Gorilla gorilla gorilla), we investigated their ability to navigate at long distances, and tested for how the sun was used to navigate at any scale by improving landmark visibility and/or by acting as a compass. Long episodic movements ending at a distant swamp, a unique place in the home range where gorillas could find mineral-rich aquatic plants, were straighter and faster than their everyday foraging movements relying on spatial memory. This suggests intentional targeting of the swamp based on long-distance navigation skills, which can thus be efficient over a couple of kilometres. Interestingly, for both long-distance movements towards the swamp and everyday foraging movements, gorillas moved straighter under sunlight conditions even under a dense vegetation cover. By contrast, movement straightness was not markedly different when the sun elevation was low (the sun azimuth then being potentially usable as a compass) or high (so providing no directional information) and the sky was clear or overcast. This suggests that gorillas navigate their home range by relying on visual place recognition but do not use the sun azimuth as a compass. Like humans, who rely heavily on vision to navigate, gorillas should benefit from better lighting to help them identify landmarks as they move through shady forests. This study uncovers a neglected aspect of primate navigation. Spatial memory and vision might have played an important role in the evolutionary success of diurnal primate lineages.

Evaluation of sensor-based health monitoring in dairy cows: Exploiting rumination times for health alerts around parturition.

The use of sensor-based measures of rumination time as a parameter for early disease detection has received a lot of attention in scientific research. This study aimed to assess the accuracy of health alerts triggered by a sensor-based accelerometer system within 2 different management strategies on a commercial dairy farm. Multiparous Holstein cows were enrolled during the dry-off period and randomly allocated to conventional (CON) or sensor-based (SEN) management groups at calving. All cows were monitored for disorders for a minimum of 10 DIM following standardized operating procedures (SOP). The CON group (n = 199) followed an established monitoring protocol on the farm. The health alerts of this group were not available during the study but were later included in the analysis. The SEN group (n = 197) was only investigated when the sensor system triggered a health alert, and a more intensive monitoring approach was implemented according to the SOP. To analyze the efficiency of the health alerts in detecting disorders, the sensitivity (SE) and specificity (SP) of health alerts were determined for the CON group. In addition, all cows were divided into 3 subgroups based on their health status and the status of the health alerts in order to retrospectively compare the course of rumination time. Most health alerts (87%, n = 217) occurred on DIM 1. For the confirmation of diagnoses, health alerts showed SE and SP levels of 71% and 47% for CON cows. In SEN cows, SE of 71% and 75% and SP of 48% and 43% were found for the detection of ketosis and hypocalcemia, respectively. The rumination time of the subgroups was affected by DIM and the interaction between DIM and the status of health alert and health condition.

[Sense of Coherence Scale according to Antonovsky as a possible predictor for return to work for cardiac surgery intensive care patients]. / "Sense-of-coherence"-Skala nach Antonovsky als möglicher Prädiktor für den Wiedereinstieg in das Berufsleben für herzchirurgische Intensivpatienten.

BACKGROUND: For cardiac surgery patients who were employed prior to surgery, the return to their professional life is of special importance. In addition to medical reasons, such as pre-existing conditions, the success of the operation or postoperative course and patient-intrinsic reasons, which can be assessed with the Sense of Coherence (SOC) scale by Antonovsky, may also play a role in the question of a possible return into working life. METHODS: In this study 278 patients (invasive coronary artery bypass graft surgery and/or surgery on heart valves, age < 60 years, employed) were questioned postoperatively via post with the SOC questionnaire. The SOC questionnaire was used in addition to questions about return to work. The cohort was stratified according to the time of return to work. Subsequently, the point of maximum sensitivity and specificity was determined for the total SOC score and the prediction power was considered. RESULTS: Of the 278 patients, 61 questionnaires (22%) were considered as eligible and included in the analysis. Of these, 47 participants had returned to work after undergoing cardiac surgery and 14 participants had not. We observed significant differences in SOC values between both groups (146.07 ± 29.76 versus 124.29 ± 28.8, p = 0.020). Patients that returned to work within the first 6 months after surgery showed even higher SOC scores (148.56 ± 28.98, p = 0.034). CONCLUSION: Patients with an SOC score < 130 are at greater risk not to return to their professional life after cardiac surgery. The SOC is an easily obtainable score that reliably predicts the probability of return to work after cardiac surgery.

[Severe atypical ketoacidosis due to SGLT2-inhibitor therapy : Two case reports]. / Schwere atypische Ketoazidose durch SGLT2-Inhibitor-Therapie : Zwei Fallberichte.

Two female patients were admitted due to ketoacidosis. Serum glucose was moderately elevated. The patients exhibited abdominal and neurologic symptoms. Treatment consisted of metformin, insulin glargin and empagliflozin, as well as glimepiride, insulin detemir and empagliflozin, respectively. Treatment with intravenous fluid replacement, insulin, glucose, potassium and buffer solution led to a normalisation of pH and serum glucose levels. Our report describes two cases of atypical ketoacidosis with moderately elevated serum glucose during sodium-glucose co-transporter-2 (SGLT2) inhibitor therapy.

[Recurrent hypoglycemia due to an occult insulinoma]. / Okkultes Insulinom als Ursache rezidivierender Hypoglykämien.

A 64-year-old woman presented with a history of recurrent hypoglycemia. A prolonged fasting test revealed an increased "amended" insulin-glucose ratio. Transabdominal ultrasound (US), computed tomography (CT) scan, and magnetic resonance imaging (MRI) did not show abnormal results. An insulinoma was suspected based on a contrast-enhanced endoscopic US examination as well as a (68)gallium-DOTA-exendin-4 positron-emission tomography (PET)/CT. The diagnosis of an insulinoma was confirmed histologically after surgical removal of the tumor. Hypoglycemia did not occur during the postoperative period. The prolonged fasting test is the gold standard for the diagnosis of an insulinoma. Novel imaging procedures, such as contrast-enhanced endoscopic US or (68)gallium-DOTA-exendin-4 PET/CT are valuable additions to the diagnostic workup.

Pancreatic diabetes manifests when beta cell area declines by approximately 65% in humans.

AIMS/HYPOTHESIS: Diabetes frequently develops in patients with pancreatic disorders. We aimed to determine the lower threshold of beta cell area for diabetes manifestation as well as the impact of insulin sensitivity on glucose homoeostasis in patients with pancreatic diabetes. METHODS: Eighty-two patients undergoing pancreatic surgery underwent pre-operative oral glucose challenge. Fractional pancreatic beta cell area was determined, and indices of insulin sensitivity and beta cell function were calculated. RESULTS: HbA1c and glucose levels were similar in patients with high and intermediate beta cell area, but were significantly higher in those with the lowest beta cell area (p < 0.0001). Insulin secretion was reduced only in patients with the lowest beta cell area (p < 0.001). The relative beta cell deficits at the onset of diabetes and impaired glucose tolerance were 64% and 21%, respectively, based on 2 h glucose levels. Deteriorating insulin sensitivity was associated with a small increase in the incidence of diabetes. CONCLUSIONS/INTERPRETATION: In conclusion, pancreatic diabetes probably develops after a reduction in beta cell area of ~65%. Post-challenge glucose excursions are much more closely related to pancreatic beta cell area than to fasting glycaemia, thereby underlining the usefulness of the OGTT in patients with pancreatic disorders.

Acute liver injury following acetaminophen administration does not activate atrophic pathways in the mouse diaphragm.

N-acetyl-para-amino phenol (APAP, usually named paracetamol), which is commonly used for its analgesic and antipyretic properties may lead to hepatotoxicity and acute liver damage in case of overdoses. Released cytokines and oxidative stress following acute liver damage may affect other organs' function notably the diaphragm, which is particularly sensitive to oxidative stress and circulating cytokines. We addressed this issue in a mouse model of acute liver injury induced by administration of APAP. C57BL/6J mice (each n = 8) were treated with N-acetyl-para-amino phenol (APAP) to induce acute drug caused liver injury and sacrificed 12 or 24 h afterwards. An untreated group served as controls. Key markers of inflammation, proteolysis, autophagy and oxidative stress were measured in diaphragm samples. In APAP treated animals, liver damage was proven by the enhanced serum levels of alanine aminotransferase and aspartate aminotransferase. In the diaphragm, besides a significant increase in IL 6 and lipid peroxidation, no changes were observed in key markers of the proteolytic, and autophagy signaling pathways, other inflammatory markers and fiber dimensions. The first 24 h of acute liver damage did not impair diaphragm atrophic pathways although it slightly enhanced IL-6 and lipid peroxidation. Whether longer exposure might affect the diaphragm needs to be addressed in future experiments.

Strong relationship between NT-proXNP levels and cardiac output following cardiac surgery in neonates and infants.

BACKGROUND: NT-proXNP, a new natriuretic peptide analyte, incorporates information about the concentrations of both N-terminal pro-atrial and pro-brain natriuretic peptides (NT-proANP, NT-proBNP). We aimed to investigate whether NT-proXNP is a reliable indicator of the cardiac index (CI) and the hemodynamic state in neonates and infants undergoing an open heart surgery. METHODS: We enrolled 26 children under the age of 1 year into this prospective study. All patients underwent an elective cardiac operation with cardiopulmonary bypass (CPB) to achieve complete biventricular repair. Peri-operative hemodynamic parameters were assessed by transpulmonary thermodilution and natriuretic peptide levels were recorded. RESULTS: The NT-proXNP level correlated significantly with the simultaneously measured NT-proANP level (r=0.60, P<0.001), but more strongly with the NT-proBNP level (r=0.89, P<0.001) and the arithmetic sum of both (r=0.88, P<0.001). NT-proXNP had a strong correlation with CI (r=-0.85, P<0.001), the stroke volume index (r=-0.80, P<0.001) and the global ejection fraction (r=-0.67, P<0.009) throughout the post-operative period. Conventionally measured parameters such as heart rate, mean arterial pressure and pulse-pressure product exhibited weaker correlations with CI than NT-proXNP. Among laboratory values, creatinine levels correlated significantly with CI (r=-0.77, P<0.001) and NT-proXNP (r=0.76, P<0.001) during the post-operative period. A post-operative NT-proXNP level of 3079 pmol/l was diagnostic for CI <3 l/min/m(2) with 89% sensitivity and 90% specificity (area under the curve: 0.91 +/- 0.05). CONCLUSION: NT-proXNP is a good marker of cardiac output following pediatric cardiac surgery and might be a useful tool in the recognition of a low output state.

Metabolic consequences of a 50% partial pancreatectomy in humans.

AIMS/HYPOTHESIS: Partial pancreatectomy is frequently performed in patients with pancreatic tumours or chronic pancreatitis, but little is known about the metabolic impact of this intervention. We examined the effects of approximately 50% partial pancreatectomy on glucose homeostasis and insulin secretion. METHODS: Fourteen patients with chronic pancreatitis, ten patients with pancreatic carcinoma and 13 patients with benign pancreatic tumours or extra-pancreatic masses (control group) underwent 240 min oral glucose tolerance tests before and after pancreatic tail-resection (n = 12), duodenopancreatectomy (n = 19) or duodenum-preserving pancreatic-head resection (n = 6). RESULTS: Partial pancreatectomy led to a reduction in post-challenge insulin excursions by 49% in chronic pancreatitis patients, 52% in carcinoma patients and 55% in controls (p < 0.05). Nevertheless, post-challenge glucose concentrations were transiently ameliorated after surgery (p < 0.001). In the control participants, pancreatic-head resection caused a transient reduction of post-challenge glycaemia, whereas pancreatic-tail resection increased both fasting and post-challenge glycaemia (p < 0.05). Insulin sensitivity was highest in chronic pancreatitis patients before surgery (p < 0.01), but remained unchanged by the partial pancreatectomy. High pre-operative body weight and elevated fasting glucose levels were associated with poor glycaemic control after surgery. CONCLUSIONS/INTERPRETATION: Insulin secretion is diminished after pancreatic-head and -tail resection, but post-challenge glucose concentrations can be ameliorated after pancreatic-head resection. These data highlight the unequal impact of different surgical procedures on glucose control and suggest that obesity and high pre-operative glucose levels should be considered as risk factors for the development of hyperglycaemia after pancreatic surgery.

Diels-Alder adduct formation at solid interfaces between fullerenes and acenes.

Understanding organic-organic interfaces is rather challenging due to their large complexity regarding morphology, molecular orientation at the interface, interdiffusion, and energetics. One additional important but often neglected aspect are chemical reactions occuring at such interfaces. For solid interfaces between pentacene and Buckminster-Fullerene (C60) recently very efficient Diels-Alder (D-A) adduct formation has been reported. Considering the importance of pentacene/C60 as prototypical donor-acceptor combination to study fundamental processes in organic photovoltaics, understanding this effect is essential. In this work, we provide detailed NEXAFS-based investigations with respect to the temperature-dependence and reaction zone depth of this effect. Moreover, we widely vary the interface morphology and observe that the D-A adduct formation is most efficient for bulk heterojunctions of pentacene and C60. By also investigating further material combinations such as PEN/C60-PCBM and interfaces between C60 and functionalized acenes, we observe trends for the occurrence of the D-A adduct formation correlated with the different chemical properties of the involved compounds.

Early Multidisciplinary Intensive-care Therapy can Improve Outcome of Severe Anti-NMDA-receptor Encephalitis Presenting with Extreme Delta Brush.

Anti-N-methyl-D-aspartate receptor encephalitis (Anti-NMDARE) is a synaptic autoimmune encephalitis syndrome mainly affecting young females. An underlying tumor, most commonly ovarian teratomas in young females, may indicate a paraneoplastic syndrome. Prognostic factors of the clinical course of disease and outcome play a central role in view of early administration of second-line immunotherapy and intensive-care therapy. We report a case of severe Anti-NMDARE associated with unfavorable predictors including an extreme delta brush (EDB) electroencephalographic-pattern and high anti-NMDAR-antibody titers in the cerebral spinal fluid (CSF), which necessitated the admission to an intensive care unit. In spite of the poor prognosis, the patient completely recovered; we attribute this to an early escalation to second-line immunotherapy with rituximab and multidisciplinary intensive-care therapy. The present case underlines the relevance of multidisciplinary management for individuals with Anti-NMDARE.

Longitudinal study of meningococcal carrier rates in teenagers.

To gain actual information concerning the oropharyngeal carriage of Neisseria meningitidis among teenagers aged 15-18 years in Germany especially in a region with increased incidence of meningococal-related diseases prompted the study. Each teenager was swabbed three times with an interval of 2 months between the examinations. The 901 recovered N. meningitidis strains were characterized using serological (serogrouping, serotyping/serosubtyping) and molecular methods (PCR, PFGE) each. The results of the study demonstrate an overall average carrier rate of 18.8% for the three collection periods. There were, however, significant differences between the carrier rates within a given school and of different towns and counties. Of all isolates, 60.6% were not serogroupable. Serogroup B dominated (12.3%), followed by serogroup Y (9.0%) and serogroup C (3.6%). After PCR-based serogrouping of not serogroupable strains the percentages for serogroups enhanced to 18.8% for B, 10.8% for Y and 4.1% for C. Serotyping led to 305 different phenotypes with the most common being 29E:NT:P1.2,5 followed by Y:14:NST. In the 6 study towns the number of different N. meningitidis clones (PFGE types) isolated, varied between 30 and 87. In Wenden, where a prolonged outbreak had taken place, serogroup C (14.8%) was predominant. Only in this town C:2a isolates were found, all belonging to the ST-11/ET-37 complex and 12/13 matched identically to the ET-15 clone. Of the colonized teenagers, 26.7% were carriers over at least 23 weeks, 22.6% with the same strain, 36.0% were carrier for at least 15 weeks. Over all three collection periods 36.7% of the adolescents acquired a new strain. The highest acquisition rate was related to PFGE type 12.

[Blindness following reduction of a malar fracture]. / Erblindung nach Reposition einer Jochbeinfraktur.

Blindness is the most serious injury to the eye following a midfacial fracture. The onset of blindness complicating the midfacial fracture may be immediate (with the trauma), delayed (hours to days), or postoperative. The incidence of postoperative blindness lies between 0.3 and 8.3%. There are multiple mechanisms responsible for blindness but the most common reason with about 66% is probably increased intraorbital pressure attributable to intraorbital hemorrhage. The management of surgical decompression of the orbit for acute blindness is essential when treatment of a midfacial fracture is intended. Acute orbital compartment syndrome can effectively be relieved by lateral canthotomy and cantholysis and administration of high doses of corticosteroids. Further possibilities of surgical decompression of the orbit are discussed in this case report with postoperative irreversible blindness after reduction of a malar fracture and rapidly performed surgical decompression.

SurvNet@RKI - a multistate electronic reporting system for communicable diseases.

In 2001 Germany implemented a new electronic reporting system for surveillance of notifiable infectious diseases (SurvNet@RKI). The system is currently being used in all 431 local health departments (LHD), the 16 state health departments (SHD) and the Robert Koch-Institut (RKI), the national agency for infectious disease epidemiology. The SurvNet@RKI software is written in MS Access 97 and Visual Basic and it supports MS Access as well as MS SQL Server database management systems as a back-end. The database is designed as a distributed, dynamic database for 73 reporting categories with more than 600 fields and about 7000 predefined entry values. An integrated version management system documents deletion, undeletion, completion and correction of cases at any time and entry level and allows reproduction of previously conducted queries. Integrated algorithms and help functions support data quality and the application of case definitions. RKI makes the system available to all LHDs and SHDs free of charge. RKI receives an average of 300 000 case reports and 6240 outbreak reports per year through this system. A public web-based query interface, SurvStat@RKI, assures extensive and timely publication of the data. During the 5 years that SurvNet@RKI has been running in all LHDs and SHDs in Germany it has coped well with a complex federal structure which makes this system particularly attractive to multinational surveillance networks. The system is currently being migrated to Microsoft C#/.NET and transport formats in XML. Based on our experiences, we provide recommendations for the design and implementation of national or international electronic surveillance systems.

SurvNet@RKI--a multistate electronic reporting system for communicable diseases.

In 2001 Germany implemented a new electronic reporting system for surveillance of notifiable infectious diseases (SurvNet@RKI). The system is currently being used in all 431 local health departments (LHD), the 16 state health departments (SHD) and the Robert Koch-Institut (RKI), the national agency for infectious disease epidemiology. The SurvNet@RKI software is written in MS Access 97 and Visual Basic and it supports MS Access as well as MS SQL Server database management systems as a back-end. The database is designed as a distributed, dynamic database for 73 reporting categories with more than 600 fields and about 7000 predefined entry values. An integrated version management system documents deletion, undeletion, completion and correction of cases at any time and entry level and allows reproduction of previously conducted queries. Integrated algorithms and help functions support data quality and the application of case definitions. RKI makes the system available to all LHDs and SHDs free of charge. RKI receives an average of 300,000 case reports and 6240 outbreak reports per year through this system. A public web-based query interface, SurvStat@RKI, assures extensive and timely publication of the data. During the 5 years that SurvNet@RKI has been running in all LHDs and SHDs in Germany it has coped well with a complex federal structure which makes this system particularly attractive to multinational surveillance networks. The system is currently being migrated to Microsoft C#/.NET and transport formats in XML. Based on our experiences, we provide recommendations for the design and implementation of national or international electronic surveillance systems.

Consumption, knowledge, and handling of raw meat: a representative cross-sectional survey in Germany, March 2001.

Outbreaks of gastroenteritis have been repeatedly associated with the consumption of raw meat and raw meat products. To assess the potential of this problem in Germany, frequency of consumption and knowledge about and handling of raw meat during food preparation in the German population was estimated. We conducted a population-based nationwide cross-sectional survey in private households in March 2001 by random telephone numbers. Consenting German-speaking persons were randomly chosen among household members for standardized interviews. Proportions were standardized by age, sex, and region (eastern and western Germany). A total of 510 people were interviewed (response 45.1%), including 62.3% women and 31.8% considered at high risk (children younger than 10 years old, elderly more than 65 years old, and chronically ill persons). The mean age was 45.7 years. Of those who ate raw ground meat at least once a week, 17.8% lived in eastern Germany and 5.1% in western Germany, (chi-square test, P < 0.001). Teewurst was eaten by 50.8% of all respondents and 53.8% of respondents in the high-risk group. That salami or Teewurst were raw meat products was known to 58.1 and 36.3% of the respondents, respectively. Respondents reported not washing their hands (46.6%) or cleaning their cutting boards with soap (48.1%) after preparing raw meat. A total of 10.3% of the respondents had diarrhea during the last 3 months. Although knowledge is poor, consumption of raw meat products is widespread in Germany, even among high-risk persons. More information is necessary on which products contain raw meat, the potential risk of diarrhea after raw meat products are consumed, and appropriate handling of raw meat products.

Clarithromycin, amoxycillin and H2-receptor antagonist therapy for Helicobacter pylori peptic ulcer disease in Korea.

BACKGROUND: Effective anti-Helicobacter pylori therapies with few side-effects are needed. We previously showed that the regimen of amoxycillin, clarithromycin and an H2-receptor antagonist was effective in the United States. The current study tested whether this therapy would also be successful in Korea. METHODS: Patients with gastric or duodenal ulcers received amoxycillin (750 mg t.d.s.) plus clarithromycin (500 mg t.d.s.) for 2 weeks and nizatidine 300 mg at bedtime for 6 weeks. Endoscopic examinations were performed before treatment and 4 or more weeks after ending antimicrobial therapy. H. pylori status was confirmed by rapid urease testing and histological examination of gastric antrum and corpus biopsies using the Genta stain. Antibiotic resistance was tested using the E-test method. Cure was defined as no evidence of H. pylori infection 4 or more weeks after ending therapy. RESULTS: Seventy-two patients (59 males and 13 females; mean age 46 years), including 35 with duodenal ulcers, 30 with gastric ulcers and seven with both, were studied. H. pylori infection was cured in 95.8% (69/72 patients; 95% CI = 88.3-99.1%). Two of the treatment failures had culture data and one had pre-treatment resistance to clarithromycin. Smoking did not have an adverse effect on therapy. Ten patients (15%) developed side-effects during treatment, but all were mild and did not require treatment interruption. No case of reinfection was noted during follow-up. CONCLUSION: The combination of amoxycillin, clarithromycin and an H2-receptor antagonist is effective in Korean patients with H. pylori infection.

Successful low-dose amoxycillin, metronidazole and omeprazole combination therapy in a population with a high frequency of metronidazole-resistant Helicobacter pylori.

AIM: Effective anti-Helicobacter pylori therapies with few side-effects are needed. We studied the effectiveness of a low-dose combination of metronidazole, amoxycillin and omeprazole for treatment of ulcer patients in Seoul, Korea. METHODS: Patients with gastric or duodenal ulcer received metronidazole (125 mg b.d.), amoxycillin (500 mg b.d.) and omeprazole (20 mg at bedtime) for 2 weeks. Endoscopic examinations were performed before treatment and at least 6 weeks after completion of antimicrobial therapy. H. pylori status was confirmed by histological examination of two gastric biopsies using the Genta stain. RESULTS: Seventy-nine patients (64 men, 15 women, mean age 46 years) with peptic ulcer were enrolled. H. pylori infection was cured in 56 (71%) 95% CI: 60-81%). The cure rate in non-smokers was significantly higher than in smokers (88% vs. 65%, P = 0.035). Twelve pre-treatment isolates were available and metronidazole resistance was noted in all; H. pylori infection was cured in 10. Thirty-six patients cured of H. pylori have been followed for 1 year (mean of 361 days) and 2 cases became reinfected (5.5%, 95% CI: 1-18%). CONCLUSIONS: The low-dose combination of metronidazole, amoxycillin and omeprazole was effective even the in face of metronidazole resistance. Recurrence of H. pylori infection is infrequent even in countries with a high prevalence of H. pylori infection.

Baló concentric sclerosis: MR diagnosis.

An antemortem MR diagnosis of concentric sclerosis was made. After corticosteroid therapy the patient's symptoms diminished, and repeat MR revealed a decrease in the size of the lesion.

Prevalence of and risk factors for Helicobacter pylori infection in the western part of Germany.

OBJECTIVE: To ascertain the prevalence of Helicobacter pylori infection in Germany and to identify risk factors associated with H. pylori seroconversion. METHODS: Two hundred and sixty blood donors (169 men, 91 women; median age 29 years, range 18-61 years, 92% with German parents, all white) were studied. None had previously been treated for H. pylori infection. Their serum samples were analysed for H. pylori immunoglobulin (lg) G antibodies with a validated enzyme-linked immunosorbent assay (ELISA). All subjects completed a complex questionnaire under supervision. Special attention was paid to their present and childhood (at the age of 8 years) living conditions. To identify independent risk factors for seropositivity, a multivariate, stepwise forward, unconditional, logistic regression analysis was performed. RESULTS: In total, 102 participants (39.2%) were seropositive for H. pylori. Seroprevalence increased significantly with age (21.1% aged 21 or younger compared with 60.0% over 51 years of age). According to the multivariate analysis of the unclassified data [odds ratio (95% confidence interval)], variables such as age [1.04 (1.01-1.07) per year], persons per room in household in childhood [2.14 (1.07-4.26)] and number of children (< 8 years) in household at present [1.79 (1.01-3.16) per child] were significantly and independently associated with H. pylori seroprevalence. CONCLUSION: Crowded living conditions in childhood affect current H. pylori status. In addition, the number of children in the present household increases the risk of infection for the adult family members. This suggests that children are an additional source of infection, probably due to close and frequent physical contact outside the immediate family.