Prevention and treatment of gastrointestinal infections in infants by using immunobiologic methods.
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Biomedical subjects
Publications and source records attributed to R Lodinová.
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The cellular immune response (MIF, E-rosette formation and changes in nucleolar morphology of lymphocytes) was followed as related to age and antigenic stimulation. MIF in healthy infants increased from the 2nd to the 12th week of life as compared with the first week, probably due to BCG vaccination. The total and active E-rosette formation did not change during the whole period of investigation. Ring-shaped nucleoli increased gradually from the second week of life. Active nucleoli increased up to the 4th week, i.e. after BCG vaccination and then slowly decreased. Micronucleoli being high in the first week, decreased during 24 weeks of life. After artificial colonization of the intestine the production of MIF was slightly lower in colonized infants than in controls from the 2nd to the 12th week. The other parameters followed were not influenced by colonization.
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Changes in nucleolar morphology of the lymphocytes were studied in peripheral blood smears of infants from birth up to one year of life. A marked proportional increase of lymphocytes with active nucleoli was found during the first month.
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Twenty five breast-fed and 25 formula-fed infants were colonised by oral administration of a living suspension of E. coli 083. Twenty breast-fed and 13 formula-fed infants were followed as controls. Specific antibody titres in serum, stool filtrates and milk, and secretory IgA levels in stool filtrates and milk were determined in samples taken fortnightly from birth until 20 weeks of age. The haemagglutinating antibody in serum and milk increased in the colonised groups, but in stool filtrates an inhibitory effect of breast-milk was demonstrated. Secretory IgA levels in stool filtrates were significantly higher in colonised infants and breast-fed controls than in bottle-fed infants during the period of breast feeding. Then levels in the colonised groups remained high, but in breast-fed controls they decreased to values found in bottle-fed controls. Artificial colonisation evoked local antibody and secretory IgA responses in the intestine, as well as an antibody response in the mother's mammary gland. The possible protective effect of those responses is discussed.
The influence of lysozyme feeding on the production of serum immunoglobulins and intestinal secretory IgA was studied in full-term and premature infants, from birth up to the age six months. Serum immunoglobulins were not influenced by lysozyme administration. An increase in secretory IgA was found in stool filtrates of full-term lysozyme-fed infants; no secretory IgA was detected in controls. In this way lysozyme feeding partly substituted for passive transfer of secretory IgA from maternal milk.
Methodical possibilities for detection of enterotoxic strains of E. coli and the frequency of appearence of these strains in infants and adults suffering from diarrheal diseases are reviewed. Our own study, using the ligated rabbit intestinal loop, revealed 6.8% incidence of enterotoxin producing strains among the classical enteropathogenic serotypes of E. coli, isolated from stools of infants with mild diarrhoea. The model of mice intestinal loop was not found to be suitable for detection of enterotoxin of E. coli strains. The most sensitive model seems to be the intestine of precolostral piglet; however this model is not suitable for routine tests.
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