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排序方式: 共有194条查询结果,搜索用时 458 毫秒
1.
2.
Circannual variation in lymphocyte subsets, revisited 总被引:2,自引:0,他引:2
BACKGROUND: Circadian and circannual variations in lymphocyte subsets, especially CD8+ T-lymphocytes, have been reported. This study focuses on CD4+ T-lymphocyte seasonal variation over a 6-year 8-month period. STUDY DESIGN AND METHODS: Lymphocyte subsets were quantitated monthly for four healthy individuals from 1986 through 1992 as part of a flow cytometry quality-control program. RESULTS: In general, there were no significant seasonal changes in the total number of white cells or in total lymphocyte counts. The absolute numbers of CD4+ T-lymphocytes were lowest in summer when the CD8+ T-lymphocytes were highest. Mean CD4+ T-lymphocyte counts were 846, 967, 618, and 695 per microL for Subjects 1 through 4, respectively, in winter and 432, 670, 355, and 766 per microL, respectively, in summer. Two healthy subjects had CD4+ T-lymphocyte counts lower than 300 per microL on one or more occasions during the study period. In three of the four subjects, the percentage of B-lymphocytes in winter was almost double that in summer. In one of the four subjects, no circannual rhythm was observed in these lymphocyte subpopulations. CONCLUSION: The seasonal variation in CD4+ T- lymphocyte counts demonstrated in three healthy individuals over almost 7 years is again of interest in light of renewed consideration of using surrogate tests, such as CD4+ T-lymphocyte counts, to screen for AIDS- like diseases that may be in the blood supply. 相似文献
3.
The family history in family practice: a questionnaire study 总被引:9,自引:7,他引:2
OBJECTIVES: Our aims were to investigate family medical history taking in
general practice, and to evaluate the value attached to the family medical
history as an aid to decision making in general practice. METHOD: A postal
questionnaire survey was conducted among all 291 GPs working within the
Calderdale and Kirklees Health Authority area. Each questionnaire was
followed by a reminder. The main outcome measures were answers to questions
on routine and opportunistic family history taking and a question about
transmitting knowledge about genetic risk to other members of the family.
Questions were also posed about the value attached to the family medical
history as an aid to decision making. RESULTS: A total of 193 GPs returned
the questionnaire (response rate 66.3%). On registration, 94.3% of GPs
indicated that enquiries were made about a family history of coronary heart
disease. Breast and colorectal cancer were specifically asked about by
48.4% and 30.7% of GPs, respectively. One-fifth of respondents indicated
that they asked a general question about family medical history. A little
over one-quarter of respondents indicated that they made opportunistic
enquiries about the family history or suggested that the patient should
inform other members of the family about possible risks. In the scenarios
highlighted in this study, the majority of respondents felt that the family
medical history had value as an aid to decision making. This was
particularly the case for checking a patient's cholesterol (92.1%) and for
initiating referrals in younger patients with possible cancer-related
symptoms (three-quarters of respondents). CONCLUSION: GPs value the family
medical history as an aid to decision making. Unfortunately, apart from
enquiries about coronary heart disease, routine or opportunistic family
history taking is not occurring in practice. Mechanisms need to be sought
to extract information from the family medical history so that it can be
more effectively used by GPs.
相似文献
4.
Performance of CHROMagar MRSA medium for detection of methicillin-resistant Staphylococcus aureus 总被引:2,自引:0,他引:2 下载免费PDF全文
Diederen B van Duijn I van Belkum A Willemse P van Keulen P Kluytmans J 《Journal of clinical microbiology》2005,43(4):1925-1927
CHROMagar MRSA was evaluated for its ability to identify methicillin-resistant Staphylococcus aureus (MRSA). A well-defined collection consisting of 216 MRSA strains and 241 methicillin-susceptible Staphylococcus aureus isolates was used. The sensitivity of CHROMagar MRSA after 24 h of incubation was 95.4%, increasing to 100% after 48 h. The specificity was already 100% after 24 h. 相似文献
5.
B. M. W. Diederen M. J. Vermeulen H. Verbakel A. van der Zee A. Bergmans M. F. Peeters 《European journal of clinical microbiology & infectious diseases》2007,26(9):629-633
Bartonella (B.) henselae is the causative agent of cat-scratch disease (CSD), which usually presents as a self-limiting lymphadenopathy. This study
reports the development and evaluation of an internally controlled real-time polymerase chain reaction targeting the groEL gene for detection of Bartonella spp. DNA was extracted using the MagNA Pure system. The lower detection limit was 10–100 fg DNA and the in vitro sensitivity
of the assay was not affected by duplexing with an internal control PCR. The real-time PCR assay detected DNA from all five
B. henselae strains tested, and from B. birtlesii, B. vinsonii subsp. vinsonii, B. vinsonii subsp. arupensis and B. doshiae. The assay generated negative results with a selection of other bacteria, including several Mycobacterium spp., Streptococcus pyogenes and Staphylococcus aureus. Results of real-time PCR in clinical samples were compared with those of a conventional 16S rDNA-based PCR assay. During
the period described in the Material and methods section, real-time PCR and conventional 16S PCR were performed on 73 clinical
samples. Of these samples, 29 (40%) were found to give positive results and 44 (60%) gave negative results, both by real-time
PCR and by conventional PCR, with a 100% agreement between the two tests. The PCR developed in this study is a rapid, sensitive,
and simple method for the detection of Bartonella spp. in CSD and is suitable for implementation in the diagnostic laboratory. 相似文献
6.
J. P. Bruin B. M. W. Diederen 《European journal of clinical microbiology & infectious diseases》2013,32(3):333-334
We evaluated the ability of a new antigen test (TRU Legionella® assay, Meridian Bioscience, Cincinnati, OH, USA) to detect Legionella pneumophila serogroup 1 antigen in urine. The results were compared with those obtained with the Binax NOW® urinary antigen test (Binax, Portland, ME, USA). The sensitivities and specificities were 73 % [95 % confidence interval (CI), 65 to 81 %] and 100 %, respectively, for the Meridian TRU Legionella test and 77 % (95 % CI, 68 to 84 %) and 100 %, respectively, for the Binax NOW urinary antigen test. The sensitivity of the Meridian TRU Legionella test increased to 81 % if tests were re-examined after 60 min of incubation. Prolonged incubation did not affect the specificity. We conclude that both assays evaluated have similar performance characteristics and are suitable for the rapid diagnosis of Legionnaires’ disease. 相似文献
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Oliver D. Howes Paul Shotbolt Michael Bloomfield Kirstin Daalman Arsime Demjaha Kelly M. J. Diederen Kemal Ibrahim Euitae Kim Philip McGuire René S. Kahn Iris E. Sommer 《Schizophrenia bulletin》2013,39(4):807-814
Background: The psychosis phenotype appears to exist in the population as a continuum, but it is not clear if subclinical psychotic symptoms and psychotic disorders share the same neurobiology. We investigated whether the dopaminergic dysfunction seen in psychotic disorders is also present in healthy, well-functioning people with hallucinations.
Methods: We compared dopamine synthesis capacity (using 6-[18F]fluoro-L-DOPA [[18F]-DOPA] positron emission tomography imaging) in 16 healthy individuals with frequent persistent auditory verbal hallucinations (hallucinating group) with that in 16 matched controls. Results: There was no significant difference in dopamine synthesis capacity in the striatum, or its functional subdivisions, between groups and no relationship between subclinical psychotic symptom severity or schizotypal traits and dopamine synthesis capacity in the hallucinating group. Conclusions: Altered dopamine synthesis capacity is unlikely to underlie subclinical hallucinations, suggesting that although there may be a phenomenological psychosis continuum, there are distinctions at the neurobiological level. 相似文献