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Biomedical subjects

I Suassuna

Publications and source records attributed to I Suassuna.

At least 37 records · Page 2Linked to original sources
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[In vitro susceptibility to a new antimicrobial agent (imipenem) of pathogens isolated from inpatients at various centers].

Imipenem is a beta lactam antibiotic, a highly potent new carbapenem with broad antibacterial spectrum. To test the "in vitro" efficacy of this antimicrobial agent in pathogens more frequent in several Medical Centers in Brazil, susceptibility testing with 10 mcg imipenem disks and, or corresponding MIC were carried out with 1231 recent isolates of 41 different bacterial species, obtained mainly from hospitalized patients in 5 different medical centers of the cities of S. Paulo, Rio de Janeiro and Salvador. Our preliminary results with this antibiotic, in final phases of clinical and laboratorial experimentation in this country, are very promissing with, 96.79% of susceptibility of test isolates to 10 mcg imipenem disks and corresponding MIC correlation of up to 4 micrograms/ml. (92.31%). Of the 9 bacterial species more frequently isolated totaling 1108 (82%) of the 1230 test isolates, disk susceptibility was 99% (E. coli), 93% (Pseudomonas aeruginosas), 87% (Staphylococcus aureus), 100% (Klebsiella pneumoniae), 98% (Klebsiella sp), 97% (Proteus mirabiles), 94% (Enterobacter sp), 100% (Streptococcus faecalis) with good MIC correlation (up to 8 mcg/ml) and 100% for the anaerobic species Bacteroides sp (MIC up to 4 micrograms/ml). "In vitro" efficacy to hospital pathogens with high frequency of resistance to most antibiotics as Pseudomonas aeruginosa and to anaerobes notably Bacteroides sp is emphasized.

Bacteria↗
PubMedDate not supplied

[Biotyping and resistotyping for epidemiological tracing of the fecal origin of Klebsiella pneumoniae in urinary infections].

Twenty-four (82.7%) out of 29 patients suffering from hospital acquired urinary infections by Klebsiella pneumoniae had the same species in their faeces. Biotyping of 24 urinary and 219 fecal strains of K. pneumoniae resulted in 50 different biotypes - an average of four biotypes per fecal sample. Ten patients (34.4%) had the same biotype in urine and faeces without any correlation with previous vesical catheterization (p greater than 0.05). Using resistotyping to four chemical compounds selected among 34 tested substances (brilliant green, malachite green, potassium tellurite and mercuric chloride) 16 different resistotypes were found. Fourteen patients (58.3%) presented the same resistotype in urine and faeces but only in five patients was there correlation with simultaneous biotyping identity. Simultaneous occurrence of identical biotypes or resistotypes in faeces and urine occurred in only 54.2% of cases. However, there was a significant association between resistance ot mercuric and tellurite ions in fecal and urinary strains isolated from the same patient (p less than 0.001).

Adolescent↗
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[Cytotoxic and hemolytic activities in uropathogenic Escherichia coli].

Fifty nine Escherichia coli strains obtained from patients with upper or lower urinary tract infections (UTI) and 30 E. coli strains isolated from stools of healthy individuals were tested for hemolytic and cytotoxic activities. Forty four percent of uropathogenic E. coli (UPEC) and 3.3% of fecal E. coli were hemolytic. Among the hemolytic UPEC, 92% produced alpha-hemolysin. A cytotoxic activity was detected in culture filtrates of 71% of UPEC strains and 30% of fecal E. coli. No relationship was found between cytotoxic and hemolytic activities or between cytotoxic titers and UPEC origin (upper or lower UTI). E. coli cytotoxin has a cytocidal activity against some epithelioid cultured cell lines (Vero, HeLa and Hep-2) but was almost inactive for avian-fibroblast cells. Cytotoxin-affected cells appeared rounded, refractile and detached from the surface of the vessel. Some characteristics exhibited by the cytotoxin as the morphological response induced on cells, the increasing of cytopathic effect with time, its irreversible cytocidal activity and its heat-lability resemble the properties described for E. coli Verotoxin (VT). Adherence to uroepithelial cells is recognized as a virulence factor for UPEC. It is suggested that cell damage by cytotoxic and adhering UPEC might contribute to E. coli virulence to urinary tract.

Cytotoxins↗
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Isolation of Pseudomonas cepacia in cystic fibrosis patient.

Pulmonary infection on cystic fibrosis (CF) patients are associated with a limited qualitative number of microorganisms. During the colonization process, Staphylococcus aureus usually precedes Pseudomonas aeruginosa. This latter is at first non-mucoid, being replaced or associated to a mucoid morphotype which is rare in other diseases. In 1980, Pseudomonas cepacia appeared as an important agent in CF pulmonary infections with a mean frequency of about 6.1% isolations in different parts of the world. The primus colonization mainly occurs in the presence of pre-existent tissue lesions and the clinical progress of the disease is variable. In some patients it can be fulminant; in others it can cause a gradual and slow decrease in their pulmonary functions. The concern with this germ isolation is justified by its antibiotic multiple resistance and the possibility of direct transmission from a colonized patient to a non-colonized one. We reported the first case of P. cepacia infection in a CF patient in our area. The microbiological attendance to this patient had been made from 1986 to 1991 and the first positive culture appeared in 1988. The sensitivity profile showed that the primus colonization strain was sensitive to 9 of 17 tested antibiotics, however in the last culture the strain was resistant to all antibiotics. These data corroborate the need for monitoring the bacterial flora on CF patients respiratory system.

Burkholderia cepacia↗
PubMedDate not supplied

Use of a selective medium with potassium tellurite to follow intestinal colonization of hospitalized patients by drug-resistant Enterobacteriaceae.

Nosocomial infections are a relevant factor in complicating the recovery of patients interned for even minor causes. In a attempt to determine their origin it is crucial to consider that their origin is of an endogenous nature. Looking for an accessible expression of intestinal colonization we analyzed fecal samples from 3 separate groups of hospital patients collected after different lengths of time. For practical reasons one group was studied prospectively and two other groups (patients hospitalized for up to 7 days and patients hospitalized for more than 7 days) were compared to one another. We looked for the emergence of tellurite resistance among Enterobacteriaceae using a selective medium, MacConkey potassium tellurite (MCPT). The frequency of prospectively studied patients with tellurite resistant strains was significantly greater after 7 days of hospitalization. For the two other groups, patients with more than 7 days of hospitalization showed a significant increase of bacterial species and of strains with new antimicrobial resistance markers. High molecular weight plasmids were detected in some of these strains. These data show that the MCPT medium is a useful tool for the investigation of bowel colonization in hospitalized patients by drug-resistant Enterobacteriaceae.

Adult↗
PubMedDate not supplied

[Newborn intestinal colonization by multidrug resistant enterobacteria in a neonatal unit]

OBJECTIVE: To evaluate the occurrence of intestinal colonization in newborns by multidrug-resistant enterobacteria strains (MDRES) during hospital stay after birth. We used selective media in an attempt to determine the relationship between isolation of these strains and some of the presumed colonization risk factors. METHOD: A sequencial inclusion study of 30 newborns was carried out in the neonatal unit of the HUPE, State University Hospital, a general 600-bed tertiary care hospital. We obtained clinical and epidemiological information from medical records and collected a fecal sample from each newborn, which was plated in gentamicin (8mg/ml) medium and potassium tellurite (25mg/ml) medium. The isolated strains were biochemically identified and also submitted to tests of antimicrobial susceptibility. Nine MDRES were submitted to an assay for plasmid conjugational transfer. RESULTS: We isolated 56 distinct MDRES from 14 among 30 newborns (46.7%). Klebsiella pneumoniae was the most common bacterial species (38/56 (68%). We found statistical association between individual MDRES isolation and presence of 3 or 4 of the following colonization risk factors considered: antimicrobial use, low weight (<2.500g), more than 6 days of hospitalization and artificial milk feeding (p< 0.02). We could detect plasmid resistance transfer by bacterial conjugation for 8 among 9 MDRES. CONCLUSION: The seletive cultura media were useful to detect the high frequence of newborns colonized by MDRES in association with well established infection risk factors. We emphasize the importance of reinforcing control rules aiming at preventing intestinal colonization viewed as a risk of nosocomial infection.

Journal Article↗