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At least 199 records · Page 11Linked to original sources
PubMed2002

Difference in DNA sequences in SSU rDNA variable regions among pathogens isolated from different epidemic foci of visceral leishmaniasis in China.

OBJECTIVE: To confirm the existence of point mutations in the SSU rDNA variable regions of 5 Leishmania donovani (L.d.) isolates from different epidemic foci in China. METHODS: Specific SSU rDNA fragments from nuclear DNA of 7 Leishmania species/isolates were amplified by PCR and then cloned into pGEM(R)-T Easy Vectors. After that, the specific fragments were sequenced by an automated DNA sequencer. RESULTS: Sequence analysis showed that the amplified DNA fragments of 7 Leishmania species/isolates were all 392 bp in length. All 5 point mutations were located in two unique sequence blocks (UQ-I and UQ-II), and no insertions or deletions were found. The identities of comparison of Leishmania in GeneBank were more than 98%. CONCLUSION: Five point mutations exist in the SSU rDNA variable region of 5 L.d. isolates from different epidemic foci of visceral leishmaniasis (VL) in China. Sequence differences of the SSU rDNA variable region exist among L.d. isolates from different foci.

Animals↗
PubMed1989

Functional and metabolic activity of bovine pulmonary lavage cells phagocytically stimulated with pathogenic isolates of Pasteurella haemolytica.

Live Pasteurella haemolytica biotype A, serotype 1 isolates (n = 3) and Escherichia coli K-12, strain W3110, were reacted with bovine pulmonary lavage cell (PLC) suspensions. The comparative effects of the different bacteria on the functional and metabolic activity of alveolar macrophages (AMO) in the PLC suspensions were assessed simultaneously by use of 51Cr release, luminol-dependent chemiluminescence (LDCL), and AMO bactericidal assays. The bovine PLC responded differently to E coli, than to the 3 P haemolytica isolates in each of the 3 experimental test systems; however, responses to each of the P haemolytica isolates were not found to be significantly different. Unopsonized live P haemolytica cells adversely affected the functional and metabolic response of PLC, whereas there was no evidence of a cytotoxic (cytocidal) influence of E coli. A difference in 51Cr release for reaction mixtures containing E coli and P haemolytica was not detected at zero time; however, at each subsequent time, reaction mixtures phagocytically stimulated with P haemolytica had significantly increased amount of 51Cr release (P less than 0.05), compared with those mixtures containing E coli. Bovine AMO in the PLC suspensions were able to effectively kill E coli in vitro, but were unable to prevent survival and subsequent growth of P haemolytica. The luminol-dependent chemiluminescence profiles for reaction mixtures phagocytically stimulated with E coli provided evidence of sustained production of oxygen radicals with antimicrobial capabilities by bovine AMO in the PLC. Production of these highly reactive antimicrobial oxidants appeared initially in cultures containing P haemolytica but, subsequently, their production declined precipitously and ceased altogether.

Animals↗
PubMed1989

[Clinically relevant pathogens isolated from blood cultures of inpatient treated children (1972 to 1985)].

Blood cultures are extremely useful in diagnosing various bacteremic diseases in childhood. The results obtained in this study are presented in relation to two periods of equal length (1972-1978, 1979-1985). At the present time there are about 22 relevant isolates from blood cultures per 1000 admitted children and year in the Department of Pediatrics, and about 3 isolates per 1000 admitted children and year in the Department of Pediatric Surgery, respectively. From newborns we isolated most frequently E. coli, Staph. aureus, B-Streptococci, Pseudomonas aeruginosa, Klebsiella pneumoniae, and yeasts. From children beyond the first month of life Haemophilus influenzae, Streptococcus pneumoniae, other streptococci, Neisseria meningitidis, and Staph. aureus were the most frequent identified etiologic agents. The main factors influencing the spectrum of agents causing bacteremia are: age of patients, status of hospitals, and applicated diagnostic and therapeutic procedures.

Bacteria↗
PubMed1988

[Current resistance status of pathogens isolated from bile and its development since 1976 in the Suhl district].

Bile was collected intraoperatively and through duodenal tubes from patients and was microbiologically investigated. E. coli and coliform bacteria were found to be the most common germs in bile, accounting for 51.6 per cent of all positive findings. Streptococcus faecalis and Proteus spec. increased remarkably to 17 per cent each. Calculated antibiotic therapy was found to depend for good success on knowledge of the latest resistance rates of the most common germs. These were 67 per cent E. coli to ampicillin and 40 per cent for E. coli to tetracycline and 53 or 91 per cent for Str. faecalis or Proteus spec. to tetracycline. Hence, these preparations will have to be abandoned for calculated therapy, say, for cholangitis.

Anti-Bacterial Agents↗