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Biomedical subjects

M Santosham

Publications and source records attributed to M Santosham.

At least 109 records · Page 6Linked to original sources

Oral rehydration therapy of infantile diarrhea: a controlled study of well-nourished children hospitalized in the United States and Panama.

Although oral glucose-electrolyte solutions containing 90 mmol of sodium per liter have been widely used in the treatment of acute diarrhea among under-nourished children in the developing world, they have rarely been studied in well-nourished children. We therefore conducted a controlled randomized study among well-nourished children three months to two years who were hospitalized with acute diarrhea (52 in the United States, and 94 in Panama), to compare the efficacy of this solution with that of one containing 50 mmol of sodium per liter and with standard intravenous therapy. Oral rehydration with both solutions according to protocol was successful in 97 of 98 children (one required unscheduled intravenous therapy), and in 87 (89 per cent) no intravenous therapy was required. All of six children admitted with hypernatremia were successfully treated with oral therapy alone. We conclude that glucose-electrolyte oral solutions containing either 50 or 90 mmol of sodium per liter are effective and safe in the treatment of well-nourished children hospitalized with acute diarrhea, and that they may completely replace the intravenous fluids in the majority of such children.

Child, Preschool↗

Biweekly prophylactic doxycycline for travelers' diarrhea.

A double-blind study to determine the efficacy of biweekly oral doxycycline in the prevention of travelers' diarrhea was conducted among 46 Peace Corps volunteers during their first six weeks in Honduras. The volunteers took either 100 mg of doxycycline per dose or a placebo for three weeks and were observed for an additional three weeks. There was no significant difference in the number of persons with travelers' diarrhea in the two groups (eight of 24 in the doxycycline group and 10 of 22 in the placebo group) in the three weeks when the drug was taken. However, significantly fewer episodes (P less than 0.05) of travelers' diarrhea occurred in the doxycycline group than in the placebo group at the end of the second, third, and fourth weeks. Enterotoxigenic Escherichia coli (ETEC) was the most common pathogen identified. ETEC from 13 (62%) of 21 stool samples were resistant to doxycycline. Biweekly doxycycline was only marginally effective in preventing travelers' diarrhea and did not prevent diarrhea secondary to doxycycline-resistant ETEC.

Adult↗

Traveler's diarrhea associated with rotavirus infection: analysis of virus-specific immunoglobulin classes.

An enzyme-linked immunosorbent assay for the detection of rotavirus-specific immunoglobulin G (IgG), IgM, and IgA antibodies was used in a serological study of Traveler's diarrhea. The antigenically related simian rotavirus (SA-11) was used as antigen in this study. Serum was obtained from two groups of volunteers before travel (pre-travel) and at various times after arrival at their destination (post-travel). One group consisted of 47 American Peace Corps volunteers who traveled to Honduras, and the second group consisted of 66 Panamanian travelers who visited Mexico. An association between rotavirus and Traveler's diarrhea was found in each group with 36% of American Peace Corps volunteers and 30% of Panamanians with diarrhea demonstrating a greater than or equal to 4-fold increase in rotavirus antibody titers in the post- as compared to the pre-travel specimens. While no rotavirus-specific IgM antibody was detected in any serum tested, increases in specific antibody were found in both the IgG and IgA immunoglobulin classes.

Adult↗

Absence of increasing incidence of meningitis caused by Haemophilus influenza type b.

An epidemiologic survey of meningitis caused by Haemophilus influenzae type b in children aged zero to four years during an 11-year period (January 1965-December 1975) was conducted in the Baltimore, Maryland, metropolitan area to examine recent trends in the incidence of this disease. Cases of H. influenzae meningitis were identified at all 19 hospitals in the city and county of Baltimore and all 41 hospitals in the surrounding area. The population at risk (age, zero to four years) was estimated using yearly birth rates provided by the state of Maryland and U.S. Census information for 1960 and 1970. Yearly age-adjusted incidence was calculated; in contrast to previous studies, there was no significant increase in the annual incidence (range, 12-27; mean, 19.3/100,000 population at risk). Previous reports of recent increases in the incidence of meningitis caused by H. influenzae type b may be due to differences in study techniques.

Black People↗

Detection and quantitation of bacteremia in childhood.

Quantitative blood cultures were sought in 383 children, from whom routine blood cultures were obtained because of fever, by direct plating of 10 and 100 microliter blood onto solidified media. There were 14 positive cultures from 12 patients. These were 7 Hemophilus influenzae type b, 5 Streptococcus penumoniae, and 2 Staphylococcus aureus. The direct-plating technique permitted more rapid identification of positive cultures, and detected three episodes not identified by routine broth culture. Bacterial counts ranged from 20 to greater than 10(4) bacteria/ml blood. In the three cases of H. influenzae type b meningitis, bacteremia exceeded 10(3)/ml. Among nine patients in whom bacteremia was unassociated with meningitis, (bacteremia without evident localized disease 5, pneumonia 2, epiglottitis 1, peritonitis 1), bacteremia was less than 10(3)/ml. This technique may aid detection of bacteremia and help identify those children at highest risk for developing septic complications, such as meningitis.

Bacteriological Techniques↗

Reconstitution of B and T lymphocyte function in severe combined immunodeficiency disease after transplantation with thymic epithelium.

A patient with severe combined immunodeficiency has been given a transplant of thymic epithelium obtained from short-term culture of normal human thymus. 4 wk after transplantation immunoglobulin was detected and the patient now has normal levels of the three main classes. Functional antibodies of four specificities have been detected. An increase in reactivity to allogeneic cells and phytohaemagglutinin has been observed, with an increase in E rosettes; a positive delayed skin test to candida antigen is now present. The patient has shown reversal of wasting and has been free of infection for 7 months since receiving the transplant. It appears that under certain circumstances thymic epithelium reconstitutes both T and B cell functions.

B-Lymphocytes↗

Haemophilus influenzae disease in the White Mountain Apaches: molecular epidemiology of a high risk population.

Based on a 10-year retrospective and a 15-month prospective analysis, White Mountain Apache Indian children younger than 5 years were found to have an annual incidence of Haemophilus influenzae meningitis of 254 cases/100,000--an 8-fold higher incidence than that seen in the general United States population. In our prospective surveillance, H. influenzae isolates from cases of systemic disease were further characterized by capsular type, biotype and by outer membrane protein (OMP) and lipopolysaccharide (LPS) patterns on sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). Unexpectedly, H. influenzae type a strains were isolated in 3/18 cases of systemic disease. All other disease-producing strains were type b. H. influenzae b strains possessing common OMP, LPS, capsular and biotype characteristics were isolated from individuals in geographically distinct communities within the reservation. These apparently identical strains were isolated from different individuals who had systemic infections that occurred months apart (longest interval, 14 months). Both OMP and LPS subtyping were necessary to discriminate among invasive H. influenzae isolates.

Age Factors↗