Search PubMed⌕ Search

Biomedical subjects

R Cisterna

Publications and source records attributed to R Cisterna.

At least 127 records · Page 7Linked to original sources
PubMed1990

In vitro susceptibility of Aeromonas caviae, Aeromonas hydrophila and Aeromonas sobria to fifteen antibacterial agents.

In vitro testing of the activity of 15 antibacterial agents against 522 clinical isolates of Aeromonas species demonstrated some species-associated trends. Amoxicillin plus clavulanic acid was effective against approximately 45% of Aeromonas caviae and Aeromonas hydrophila, but all Aeromonas sobria isolates were resistant. Aztreonam, piperacillin and mezlocillin were highly active against all the strains of Aeromonas tested. Ticarcillin was equally effective against Aeromonas caviae and Aeromonas hydrophila, but more than 50% of Aeromonas sobria isolates were resistant. The latter species was more susceptible to cephalosporins than Aeromonas hydrophila and Aeromonas caviae. Chloramphenicol, tetracycline and trimethoprim-sulfamethoxazole were extremely active against all three Aeromonas species, likewise ofloxacin and ciprofloxacin. Aztreonam, third-generation cephalosporins, chloramphenicol and the quinolones can thus be considered for therapy of infections when Aeromonas is implicated.

Aeromonas↗
PubMed1990

Different antibody response against Candida albicans cell wall antigens in cervicovaginal secretions of patients with vulvovaginal candidiasis.

Vaginal washings from 118 women were investigated by means of immunofluorescence for the presence of antibodies against Candida albicans. A significantly (p less than 0.02) higher antibody titer was found in the samples from patients with clinically evident vulvovaginal candidiasis. Vaginal secretions from those patients with a positive culture for C. albicans were assayed by means of Western blotting. A distinct band pattern was found in the group of patients with a positive culture and the classical clinical picture of C. albicans vulvovaginitis.

Antibodies, Fungal↗
PubMed1990

[Detection of human immunodeficiency virus in seronegative adults].

The diagnosis of human immunodeficiency virus infection is sometimes difficult or nonspecific, both in early and late stages, as the patients may be seronegative at the time of testing. Although serologic testing usually suffices to identify infected individuals and to follow up the course of the infection, in some cases direct detection of the virus is required. The culture of the mononuclear cells of the patient permits, after stimulation with mitogens and interleukin-2, the expression of viral antigens even in asymptomatic patients with latent or apparently nonproductive infection. In this way we have recovered the virus in four patients without serological evidence of infection. The possibility that human immunodeficiency virus infection can be undetectable with the usual diagnostic techniques, at least in a small proportion of patients, supports the need to use other methods such as direct viral culture to permit the identification of a greater number of infected individuals and the adoption of the appropriate prophylactic or therapeutic measures.

AIDS Serodiagnosis↗
PubMed1990

[Microbiological study of 30 samples of heroin].

In the present study, 30 samples of heroin from material seized by the police in Vizcaya from 7-1-1987 to 6-30-1988 were investigated. Bacillus spp were isolated in 19 samples (63.3%), coagulase negative staphylococci in 14 (46.6%), Aspergillus in 3 (10%) and S. aureus in one (3.33%). In addition, chemical analysis of the purity of heroin was carried out with gas chromatography. The purity of the samples ranged from 1.1% to 94.3%. No relation was found between the weight of the sample, its purity and its degree of microbiological contamination. In the microbiological study of 4 lemons used to dissolve the drug, Candida krusei was isolated from three samples, Aspergillus in two and Geotrichum in one.

Aspergillus↗
PubMed1990

[Presence of HBsAg in lymphocyte cultured from patients infected with human immunodeficiency virus (HIV)].

The behavior of the hepatitis B virus was investigated in mononuclear cell cultures in nine patients infected by the human immunodeficiency virus. Although only one of them was a carrier of HBsAg and four had anti-HBs in their sera, HBsAg was detected in the supernatant of the cultures from all patients. These results suggest that mononuclear cells might act as a reservoir for hepatitis B virus, and that the concomitant infection by this virus and human immunodeficiency virus may alter the natural evolution of any of both conditions.

Adult↗
PubMed1990

[Detection and antigenic distribution of hepatitis B virus in liver tissue and its relation to other serological markers of viral replication].

The aim of this work has been the production of specific monoclonal antibodies against HBV-antigens and their utilisation in order to study their distribution on liver tissue. The monoclonal antibodies anti-HBc and anti-HBs were obtained by the modified hybridoma technique. This study was performed on 50 patients affected by several chronic hepatopathies. For the detection of the antigens, avidin-biotin-peroxidase complex immunostaining was used. Both cytoplasmic and membranous HBsAg were detected in 15 out of 16 HBsAg+ patients; 8 of 12 HBsAg-/anti-HBc+ patients and 1 HBsAg-/antiHBc- patient. Cytoplasmic and nuclear HBcAg was observed in 12 of 16 HBsAg+ patients and 4 of 20 HBsAg- patients. Although the presence of serum HBsAg is an index of liver infection, in some HBsAg-/antiHB+ patients (20%) with undetectable levels of HBsAg, hepatic injury may be disclosed by the detection of other markers of active viral replication.

Adolescent↗
PubMed1990

[Hepatitis B virus (HBV) replication in patients with various types of chronic hepatopathy].

We study retrospectively the viral replication state (HBV) of 50 patients with chronic hepatic alterations. The seric DNA-HBV and/or intrahepatic (molecular hybridization), the intrahepatic distribution of HBV antigens (specific monoclonal antibodies labelled with immunoperoxidase), conventional seric HBV markers (commercial enzymoimmunoessay) and the different histopathologic features. We found a correlation between DNA-HBV "in situ" and HBcAg intrahepatic and the seric DNA-HBV production. 81% of the patients with HBsAg (+) had intrahepatic HBcAg and 85% (11/13) of them showed the antigen in their cytoplasms. Patients with HBcAg also had seric and liver DNA-HBV (+). The lack of seric HBsAg did not mean that non-active replication of HBV did not exist because 20% of the patients with HBsAg (-) showed seric and "in situ" DNA-HBV and cytoplasmic HBcAg. The detection of DNA-HBV in endothelial cells and vascular elements in hepatic tissue show that the rate of the HBV host cells is greater.

Adolescent↗
PubMed1990

[Effect of treatment with clindamycin, erythromycin, rifamycin or gentamicin on the ingestion capacity of peritoneal macrophages in mice].

The effect of treatment with clindamycin, erythromycin, rifamycin and gentamicin on the ingestion capacity of the mouse peritoneal macrophage was studied. Female six-eight week old OF1 mice were treated with minimum and maximum doses clinically used for the different antibiotics (15 and 40 mg/kg/day of clindamycin, 15 and 57.5 mg/kg/day of erythromycin, 10 and 30 mg/kg/day of rifamycin, 3 and 6 mg/kg/day of gentamicin). Two treatment periods of 72 hours and one week were assayed for each antibiotic-dose combination. Antibiotic was administered twice daily, every twelve hours. Twelve hours after the last dose was given, macrophages were obtained through peritoneal lavage and a kinetic study of Candida albicans blastospore ingestion was made. One week treatment with 15 mg/kg/day and 72 hours treatment with 57.5 mg/kg/day of erythromycin produced a significant ingestion enhancement whereas one week treatment with 57.5 mg/kg/day of erythromycin and all treatments with gentamicin gave rise to an ingestion depression. 72 hours treatment with 15 and 40 mg/kg/day and one week treatment with 15 mg/kg/day of clindamycin, 15 mg/kg/day of erythromycin and 10 and 30 mg/kg/day of rifamycin did not modify macrophage ingestion capacity. One week treatment with 40 mg/kg/day of clindamycin and 10 and 30 mg/kg/day of rifamycin gave rise to an acceleration of the ingestion process.

Animals↗
PubMed1989

Relationship between the production of interferon-alpha/beta and interferon-gamma during acute toxoplasmosis.

Acute toxoplasmosis was induced in mice, and interferon (IFN) production in serum and by spleen cells was evaluated during the infection period. Interferon was characterized by acid-treatment and anti-IFN-alpha/beta neutralization. In order to verify the correlation between the unusual aspects of the IFN production and the induction of immunosuppression, splenocyte mitogen responsiveness was investigated concomitantly to IFN synthesis. The activity of Toxoplasma-induced serum IFN-alpha/beta increased gradually throughout all post-infection days, but IFN-gamma was not detected in the systemic circulation at any time during the infection. It was also observed that IFN-alpha/beta production and the capacity to produce IFN-gamma by spleen cells were closely and inversely correlated. As the infection progressed, more IFN-alpha/beta was produced, and the ability of spleen cells to produce IFN-gamma decreased. The observation that Toxoplasma-infected mice were concomitantly immunosuppressed (as documented by mitogen unresponsiveness and defective IFN-gamma production) in direct correlation to IFN-alpha/beta production, suggests that such IFN-alpha/beta production is an important factor associated with acute toxoplasmosis-induced immunosuppression.

Acute Disease↗
PubMed1989

Antibodies against Trichosporon beigelii in vaginal washings from asymptomatic women.

Trichosporon beigelii was isolated from vaginal washings from three asymptomatic women. All three women had IgG or IgA anti-T. beigelii antibody titres greater than or equal to 20 when tested by an indirect immunofluorescence assay against the three strains isolated. Titres greater than or equal to 160 were found when each patient was tested against her own isolate. Patients with Candida albicans vulvovaginitis, or from whom C. albicans or Toruloposis glabrata was isolated from vaginal washings, or who had negative cultures for yeasts, had titres less than or equal to 20.

Antibodies, Fungal↗
PubMed1989

[Characteristics of intrafamilial transmission of the hepatitis B virus: a case load contribution and review of the literature].

A total of 143 subjects have been investigated (83 adults and 60 children). All of them are relatives of 50 HBsAg carriers (26 females adults and 24 children). Relatives of these 26 females adults presents a intrafamilial prevalence of infection of 28.8% (40% in males partners). In the 24 paediatric cases, intrafamilial diffusion of HBV is more elevated 67% seropositives (72.4% of adults and 57.5% of children). Greater intrafamilial transmission of HBV are seen in chronic forms of disease. We do insist that is very necessary to investigate the immunity of HBV in relatives of HBsAg (+) subjects. Specific vaccination for those who will be seronegative should be indicated.

Adolescent↗
PubMed1989

[Transfer of plasmid beta-lactamases in enterobacteria].

The aim of the present study was to determine which types of beta-lactamases codified by plasmids are transferred by conjugation from several species of enterobacteria. To this end, 352 strains of ampicillin-resistant enterobacteria from clinical samples from the Hospital Civil of Bilbao were evaluated. Their beta-lactamase activity and their capacity to transfer this capacity by conjugation were evaluated. The several types of plasmidic beta-lactamases in the strains that conjugated and in their respective transconjugants were characterized by analytic isoelectric approach, and also the sensitivity of these stains to 20 beta-lactamic antibiotics and the size of their plasmids. Twenty different types were detected, with a clear predominance of TEM 1. Type TEM 2 was found in 19% of the strains which conjugated, and much less commonly the types SHV 1, HMS 1 and a beta-lactamase of an approximate pl of 4.9 were found. The transfer of these beta-lactamases is mediated by a great variety of plasmids and is associated with variable levels of resistance to penicillins and unstable cephalosporins. The presence of betalactamases with activity on the more stable cephalosporins has not been detected.

Conjugation, Genetic↗