Search PubMed⌕ Search

Biomedical subjects

Y Bar-David

Publications and source records attributed to Y Bar-David.

10 recordsLinked to original sources
PubMed2000

Do not disturb!

Explore the source record for details and available documents.

Humans↗
PubMed1999

Deletion of 8.5 Mb, including the FMR1 gene, in a male with the fragile X syndrome phenotype and overgrowth.

A four-year-old boy with severe psychomotor retardation, facial appearance consistent with the fragile X syndrome, hypotonia, and overgrowth was found to have a deletion including the fragile X gene (FMR1). The breakpoints of the deletion were established between CDR1 and sWXD2905 (approximately 200 kb apart) at Xq27.1 (centromeric) and between DXS8318 (612-1078L) and DXS7847 (576-291L) (approximately 250 kb apart) at Xq28, about 500 kb telomeric to the FMR1 gene. The total length of the deletion is approximately 8.5 Mb. The propositus's mother, who was found to be a carrier of the deletion, showed very mild mental impairment. Except for mental retardation, which is a common finding in all cases reported with similar deletions of chromosome Xq, this patient had generalized overgrowth, exceeding the 97th centile for height and weight. Obesity and increased growth parameters have been reported in other patients with deletions either overlapping or within a distance of 0.5 Mb from the deletion in the present patient. Thus, it is suggested that a deletion of the 8-Mb fragment centromeric to the FMR1 gene might have an effect on growth.

Child, Preschool↗
PubMed1992

Double-blind study comparing erythromycin and mupirocin for treatment of impetigo in children: implications of a high prevalence of erythromycin-resistant Staphylococcus aureus strains.

Staphylococcus aureus has been consistently isolated from a high proportion of impetiginous lesions, and in several recent studies, it was present in the majority of the cases. Since recently a large proportion of S. aureus strains in our community showed erythromycin resistance, we undertook a prospective double-blind controlled study comparing topical mupirocin with oral erythromycin to determine (i) the prevalence of erythromycin-resistant S. aureus strains in impetigo and (ii) whether an increased rate of failure of erythromycin treatment was associated with such resistance. A total of 102 patients 3 to 185 months old (median = 49 months) were enrolled. Culture was positive for 97 of 102 (95%) patients, and S. aureus was present in 93% of the patients for whom cultures were positive. S. aureus was the single pathogen in 64% of these patients. Erythromycin-resistant S. aureus strains were present in 27 of 91 (28%) patients for whom cultures were positive. In all cases but one, S. aureus was resistant to penicillin, and in all cases it was sensitive to mupirocin. A marked difference was observed in favor of mupirocin in the clinical courses of the disease. However, only patients with erythromycin-resistant S. aureus strains had unfavorable courses compared with those treated with mupirocin (failure rate, 47 versus 2%, respectively). Patients with erythromycin-susceptible S. aureus strains who received erythromycin had a failure rate of 8%. In four patients, S. aureus strains initially susceptible to erythromycin became resistant during treatment. We conclude that erythromycin-resistant S. aureus strains are commonly isolated from impetigo in our region.(ABSTRACT TRUNCATED AT 250 WORDS)

Bacteria↗
PubMed1991

Cryptosporidium in Bedouin and Jewish infants and children in southern Israel.

We conducted a 1-year prospective study in two clinics and a hospital in the Negev region of southern Israel to determine the epidemiological and clinical patterns of Cryptosporidium diarrhea among Jewish and Bedouin infants and children living in the same geographical area. A total of 612 episodes were studied: 398 in Bedouins and 214 in Jews, of which 449 occurred in patients with diarrhea and 164 in controls. Cryptosporidium was detected in 13 of 382 patients (3.4%) with diarrhea and in 1 of 138 controls (0.7%) (P = 0.078). In 5 of 13 Cryptosporidium-positive patients (38%) another pathogen was detected. No significant difference in Cryptosporidium detection rates was observed between Jews and Bedouins or between hospitalized or nonhospitalized patients. The frequency of Cryptosporidium detection did not differ significantly when three age-groups were compared (less than 6 months old, 7-12 and 13-36 months old). The rate of Cryptosporidium detection was similar among malnourished and well-nourished patients, as determined by weight-for-height percentiles. Cryptosporidium was detected more frequently during the summer months (8.3%) than during the rest of the year (1.2%) (P less than 0.001). Patients with Cryptosporidium diarrhea did not differ clinically from patients with other causes of diarrhea. However, they were characterized by the absence of fecal leukocytes. Cryptosporidium is not a rare cause of diarrhea in southern Israel. It is more prevalent during the hot and dry season and can be detected in a relatively high prevalence among very young infants. Its clinical features are indistinguishable from those of patients with non-cryptosporidial diarrhea.

Child, Preschool↗
PubMed1990

Rotavirus diarrhea in Jewish and Bedouin children in the Negev region of Israel: epidemiology, clinical aspects and possible role of malnutrition in severity of illness.

We conducted a 1-year prospective study in the Negev region of southern Israel to determine the epidemiologic and clinical patterns of rotavirus diarrhea. A total of 605 patients were studied, 392 Bedouins and 213 Jews, 441 of whom had diarrhea (449 episodes) and 164 did not. Rotavirus was the most common organism detected in children with diarrhea (63 of 444; 14%) but was rarely found in controls (3 of 163; 2%) (P less than 0.001). In 22% (12 of 54) of the rotavirus-positive patients, at least one other organism was also detected. The rate of rotavirus detection decreased as age increased, from 18% in the first year to 8% in the third year of life. Hospitalization with rotavirus diarrhea occurred more frequently in the summer. However, during winter, when diarrhea was less prevalent in the community, the proportion of cases associated with rotavirus was higher. Compared with controls, malnourished children were more likely to be hospitalized. However, rotavirus was detected in similar proportions among well-nourished and malnourished cases with diarrhea. The most prevalent rotavirus serotype was type 1 (in 69%), followed by types 4 and 2 (18 and 13%, respectively). We estimated that during the study period, approximately 2% of all Bedouin infants vs. only 0.2% of Jewish infants were hospitalized with rotavirus disease in their first year of life. Clinical signs and symptoms and stool appearance were not useful in predicting rotavirus detection. Malnutrition seems to be an important indicator of disease severity, which may explain why the toll of rotavirus-associated morbidity and mortality is particularly high among children in developing countries.

Acute Disease↗
PubMed1989

Comparison of amoxicillin and clavulanic acid (augmentin) for the treatment of nonbullous impetigo.

We undertook a prospective double-blind controlled study to compare the efficacy of a drug that usually has no antistaphylococcal activity (amoxicillin trihydrate) with the efficacy of the same drug with an addition of a beta-lactamase inhibitor (amoxicillin plus clavulanic acid [Augmentin]) in the treatment of nonbullous impetigo. Fifty-one culture-positive patients, aged 6 months to 9 years, were included, 26 in the amoxicillin group and 25 in the Augmentin group. The study groups were clinically and bacteriologically comparable at the start of the study. Staphylococcus aureus was isolated from all patients and beta-hemolytic streptococcus from 14 (29%). All staphylococci were sensitive to Augmentin but resistant to amoxicillin. Forty-nine patients completed the study. The clinical response was significantly better among the Augmentin recipients (marked improvement in 71% and 95% of patients after 2 and 5 days, respectively; no new lesions during the treatment course) than among the amoxicillin recipients (marked improvement in 44% and 68% of patients after 2 and 5 days, respectively; new lesions appeared in 20% of patients). Recurrence within 3 weeks occurred in 12 (26%) of 49 patients, and no difference was observed between the two groups. We conclude that S aureus is common in nonbullous impetigo, and that at least in some cases it plays an important role in the course of the disease that can be altered by specific therapy.

Amoxicillin↗