Congenital toxoplasmosis—prenatal aspects of Toxoplasma gondii infection

Toxoplasma gondii (T. gondii) is the cause of toxoplasmosis. Primary infection in an immunocompetent person is usually asymptomatic. Serological surveys demonstrate that world-wide exposure to T. gondii is high (30% in US and 50–80% in Europe). Vertical transmission from a recently infected pregnant woman to her fetus may lead to congenital toxoplasmosis. The risk of such transmission increases as primary maternal infection occurs later in pregnancy. However, consequences for the fetus are more severe with transmission closer to conception. The timing of maternal primary infection is, therefore, critically linked to the clinical manifestations of the infection. Fetal infection may result in natural abortion. Often, no apparent symptoms are observed at birth and complications develop only later in life. The laboratory methods of assessing fetal risk of T. gondii infection are serology and direct tests.Screening programs for women at childbearing age or of the newborn, as well as education of the public regarding infection prevention, proved to be cost-effective and reduce the rate of infection.The impact of antiparasytic therapy on vertical transmission from mother to fetus is still controversial. However, specific therapy is recommended to be initiated as soon as infection is diagnosed.     

The clinical significance of sinus membrane perforation during augmentation of the maxillary sinus.

PURPOSE: Augmentation of the maxillary sinus floor is a well-documented technique and is generally accepted as a pure implantology procedure to facilitate placement of dental implants in the posterior atrophic maxilla. The objective of this report was to evaluate the significance of the sinus membrane perforations on the incidence, complications, and success rate of this procedure. PATIENTS AND METHODS: Patients who received sinus floor augmentation and simultaneous placement of dental implant were included in this study. Subgroup I consisted of patients who had their sinus membrane perforated and repaired during the procedure with resorbable membrane. Subgroup II consisted of patients whose Schneiderian membrane was not perforated during the procedure. The patients were followed between 1 to 4 years after augmentation. RESULTS: All perforations were classified as class II or III. The success rate of the implants in the perforation group was 94.4%, and that for the nonperforation group was 93.9%. The difference between the 2 study groups was statistically not significant. A significant statistical correlation was found between the residual ridge height and the membrane perforation (P < .01). CONCLUSIONS: Mainly due to technical difficulties, maxillary sinus membrane perforation occurs more frequently with a small height of residual alveolar bone. In this study, no statistical difference was observed in the success rate of the immediate implants placed with sinus bone grafting in patients whose membrane was perforated versus those patients in whom an intact membrane was maintained.     

Sexual dimorphism of pancreatic beta-cell degeneration in transgenic mice expressing an insulin-ras hybrid gene

The human H-ras oncogene induces cell degeneration and diabetes when expressed in pancreatic beta-cells in transgenic mice. The disease develops predominantly in male mice between 5-8 months of age. Most transgenic female mice do not manifest this phenotype, even at much greater ages. However, ovariectomy induces female beta-cell degeneration similar to that in the males. In contrast, castration or the presence of the testicular feminization mutation do not alter the course of the disease in males. Treatment of males and ovariectomized females with estrogen prevents the development of diabetes. These results suggest that testicular androgens and a functional testosterone receptor are not required for the increased susceptibility of male beta-cells to the effects of the Ras oncoprotein, and that the relative resistance of female beta-cells is mediated by estrogen. In addition, a genetic component of female beta-cell resistance to Ras is revealed by crossing the transgenic mice with C3HeB/FeJ mice, which results in a pronounced increase in the incidence of female diabetes.     

Human herpesvirus 8 infection among various population groups in southern Israel

OBJECTIVE: To compare the prevalence of antibodies to human herpesvirus 8 (HHV-8) or Kaposi sarcoma-associated herpesvirus among Israeli and Ethiopian subjects. METHODS: Serum samples were obtained from 98 Israeli Jewish students aged 18-30 years, 100 HIV-1-seronegative Ethiopian immigrants to Israel of the same age, and 100 HIV-1-seronegative Ethiopian children 1-12 years old upon their arrival in southern Israel. Plasma samples were obtained from 3 hospitalized patients with multicentric Castleman disease (MCD) as positive controls. All serum samples were tested for antibodies to both latent and lytic antigens. Antibodies to the lytic antigens and the latency-associated nuclear antigen (LANA) of HHV-8 were detected by enzyme linked immunosorbent assay and by immunofluorescence assay. HHV-8 DNA from serum or plasma samples was detected by polymerase chain reaction analysis. RESULTS: Antibodies to HHV-8 LANA were detected in 2.9% of the Israeli subjects aged 18-30 years and in 26% of the Ethiopian subjects from both age groups tested. Antibodies to the lytic antigens were detected in all 3 MCD patients, in 4% of the Ethiopian children, and in 2% of the 18- to 30-year-old Ethiopians. No antibodies to the lytic antigens were detected in the Israeli students. HHV-8 DNA was detected in all 3 MCD patients and in 2 of 4 of the Ethiopian children positive for the lytic antigens. CONCLUSIONS: HHV-8 is highly prevalent in Ethiopian immigrants to Israel as compared with Israeli students. Antibodies to HHV-8 in Ethiopia are acquired before puberty. The results of this study indicate the association of HHV-8 with MCD, as has been documented by many other researchers.     

Exposure to Risk Factors and the Subjective Wellbeing of Adolescents: the Mediating Role of Time Perspective

This study examined the subjective wellbeing (SWB) and time perspectives (the psychological concepts of past, present, and future) of 460 Israeli adolescents aged 14 to 16, with high versus low exposure to socioeconomic, demographic, and familial risk factors. Participants completed questionnaire measures on time perspectives, life satisfaction, and positive and negative emotions. The results indicated that although adolescents at high risk reported less life satisfaction, no differences were found for positive emotions and negative emotion between the two groups. High risk adolescents scored significantly higher on past negative, present fatalistic, and present hedonistic time perspectives and their overall time perspective profiles were more imbalanced than their low risk peers. Structural equation modeling with bootstrap analysis confirmed that the hypothesized indirect link between risk status and poor SWB was mediated by an imbalanced time perspective profile. The findings suggest that the time perspective profile may shed light on why and how exposure to risk factors is associated with having a lower SWB in adolescence. Future studies and interventions should thus examine the ways in which a change in adolescents’ time perspective can improve their SWB.     

The Politics of Combating the Organ Trade: Lessons From the Israeli and Pakistani Experience

Israel and Pakistan—two major participants in the global organ trade—enacted legislative prohibitions on the trade at roughly the same time. The article highlights three influences that brought about this change of policy in both countries: advocacy by local physicians coupled with media coverage and reinforced by the international medical community. The analysis also explains why the two countries have differed with respect to the enforcement of the organ‐trade prohibition. The insights from the Israeli and Pakistani cases will be of use for the transplant community's efforts against organ trafficking.     

Older adults: Are they ready to adopt health-related ICT?

BackgroundThe proportion of older adults in the population is steadily increasing, causing healthcare costs to rise dramatically. This situation calls for the implementation of health-related information and communication technologies (ICT) to assist in providing more cost-effective healthcare to the elderly. In order for such a measure to succeed, older adults must be prepared to adopt these technologies. Prior research shows, however, that this population lags behind in ICT adoption, although some believe that this is a temporary phenomenon that will soon change.ObjectivesTo assess use by older adults of technology in general and ICT in particular, in order to evaluate their readiness to adopt health-related ICT.MethodWe employed the questionnaire used by Selwyn et al. in 2000 in the UK, as well as a survey instrument used by Morris and Venkatesh, to examine the validity of the theory of planned behavior (TPB) in the context of computer use by older employees. 123 respondents answered the questions via face-to-face interviews, 63 from the US and 60 from Israel. SPSS 17.0 was used for the data analysis.ResultsThe results show that although there has been some increase in adoption of modern technologies, including ICT, most of the barriers found by Selwyn et al. are still valid. ICT use was determined by accessibility of computers and support and by age, marital status, education, and health. Health, however, was found to moderate the effect of age, healthier older people being far more likely to use computers than their unhealthy coevals. The TPB was only partially supported, since only perceived behavioral control (PBC) emerged as significantly affecting intention to use a computer, while age, contrary to the findings of Morris and Venkatesh, interacted differently for Americans and Israelis. The main reason for non-use was ‘no interest’ or ‘no need’, similar to findings from data collected in 2000.ConclusionsAdoption of technology by older adults is still limited, though it has increased as compared with results of the previous study. Modern technologies have been adopted (albeit selectively) by older users, who were presumably strongly motivated by perceived usefulness. Particularly worrying are the effects of health, PBC, and the fact that many older adults do not share the perception that ICT can significantly improve their quality of life. We therefore maintain that older adults are not yet ready to adopt health-related ICT. Health-related ICT for the elderly should be kept simple and demonstrate substantial benefits, and special attention should be paid to training and support and to specific personal and cultural characteristics. These are mandatory conditions for adoption by potential unhealthy and older consumers.