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At least 163 records · Page 9Linked to original sources
PubMed2005

Very low prevalence of hepatitis C virus infection in rural communities of northeastern Brazil with a high prevalence of schistosomiasis mansoni.

The association of hepatitis C virus infection and the hepatosplenic form of schistosomiasis mansoni has been claimed to result in the concomitant evolution of the two pathologies, with a poor prognosis due to aggravated liver disease. Recently, however, some authors have begun to reject the hypothesis of a higher susceptibility of hepatosplenic schistosomal patients to HCV. The aim of the present transverse study carried out between July and August 1990 was to determine the possible association between SM and HCV markers in residents of Catolândia, Bahia State. Anti-HCV markers were assayed by ELISA-II and RIBA-II in serum samples obtained from 1,228 residents (85.8%). The anti-HCV antibody (ELISA-II) was positive in six (0.5%) individuals, eight (0.6%) cases were inconclusive and 1,214 (98.9%) were negative. However, only in one ELISA-positive serum sample (0.08%) were antibodies confirmed by RIBA-II, while two other samples assayed by RIBA-II were indeterminate. These three patients presented the hepatointestinal form of SM during the follow-up period (1976 to 1996). In conclusion, no association was observed between HCV and SM in the endemic area studied, especially among patients with the hepatosplenic form of the disease.

Adolescent↗
PubMed1992

High prevalence and persistence of cytotoxin-positive Helicobacter pylori strains in a population with high prevalence of atrophic gastritis.

Helicobacter pylori is strongly associated with both chronic gastritis and duodenal ulcer. Certain strains of H. pylori produce a vacuolating cytotoxin in vitro. At New Orleans Charity Hospital, concentrated culture supernatants from 119 of 144 (83%) H. pylori strains isolated from 86 patients at high risk of developing gastric cancer, caused vacuolization in HeLa S3 cells. Cytotoxin activity was neutralized by acid (pH 4) and basic (pH 10) solutions and proteases, and was precipitable by (NH4)2SO4, which suggests that the cytotoxin is a protein. In 66 of 86 (76.7%) patients, the H. pylori strains isolated from single or multiple sequential gastric biopsies had a vacuolating cytotoxin. These cytotoxin-positive H. pylori strains were isolated from 69% of patients with diffuse antral gastritis and 89% of patients with chronic atrophic gastritis. The latter lesion is considered a precursor of gastric cancer. The cytotoxicity persisted in sequential biopsies over an interval of several months, indicating persistence of these strains in the gastric mucosa. Fifty-eight percent (7/12) of the sera from cytotoxin-positive H. pylori-infected patients neutralized cytotoxin activity, whereas 20% (1/5) of sera from patients with H. pylori cytotoxin-negative strains and none of five H. pylori-negative patients' sera neutralized cytotoxin activity. The relevance of this cytotoxin in the pathogenesis of H. pylori-induced gastritis requires further study.

Adult↗
PubMed1992

Bio-clinical prevalence or non-prevalence of drug addiction over psychiatric symptomatology.

It has been found that opiate abusers once detoxified are afflicted with personality disorders. An attempt was made to test the origin of drug abuse by comparing a group of drug abusers with personality disorders diagnosed as borderline or schizotypal with a group of people suffering from similar personality disorders but who did not use drugs. The results of the test are discussed.

Adult↗
PubMed1989

Global changes in caries prevalence and dental manpower requirements: 2. The reasons underlying the changes in prevalence.

A Joint Working Group of the WHO and FDI was formed in 1981 to investigate the dramatic decrease in caries in children and young people that had been observed in a number of industrialized countries in the 1970s. The results of this investigation are reported in this series of three articles. Part 1 described the assembly and analysis of all available data from 20 selected countries. Nine developed countries showed substantial++ reductions in caries. The most probable reasons for these reductions will be examined here. These included: widespread exposure to fluoride in the form of fluoridated water, fluoride supplements and fluoridated toothpaste; the provision of preventive dental health services; increased dental awareness through organized education programmes; and ready access to dental services. Comparison with Japan, which has not experienced a similar reduction in caries, indicates that the single most important factor was the availability of fluoride toothpaste. The possible effects on dental manpower needs of a declining caries incidence will be discussed in Part 3.

Dental Caries↗
PubMed2000

The prevalence of alcohol, cannabinoids, benzodiazepines and stimulants amongst injured drivers and their role in driver culpability: part i: the prevalence of drug use in drive the drug-positive group.

Blood samples from 2,500 injured drivers were analysed for alcohol, cannabinnoids, benzodiazepines and stimulants. Overall, three-quarters of drivers tested negative for drugs. Alcohol was the most frequently detected drug. Cannabinoids were also detected at high rates, but the majority of drivers tested positive for THC-acid, the inactive metabolite of THC. Benzodiazepines and stimulants were detected at low rates, and detection rates for combinations of drugs were also low. Males were more likely to test positive for drugs, especially alcohol and THC, whereas females were more likely to test positive for benzodiazepines. A similar proportion of car drivers and motorcycle riders tested positive for drugs, although riders were more likely to test positive for THC. Single-vehicle crashes were particularly associated with alcohol for both car driver and riders, and for riders, multiple-vehicle crashes were particularly associated with THC.

Accidents, Traffic↗
PubMed2000

Prevalence of CagA and VacA antibodies in children with Helicobacter pylori-associated peptic ulcer compared to prevalence in pediatric patients with active or nonactive chronic gastritis.

VacA and CagA serological responses were detected in pediatric patients: 44 and 56%, respectively, in peptic ulcer (PU) patients, 33.3 and 44.4% in active chronic gastritis (ACG) patients, and 23.2 and 39.2% in non-ACG patients. Higher seroprevalence to CagA+VacA and to CagA+VacA+35-kDa antigen was found among PU patients. However, a low level of sensitivity and specificity was found for indirect detection of PU patients.

Adolescent↗