Taken the results of this retrospective analysis, serum PCT values below 0.1 ng/ml might be a marker to identify children with acute respiratory tract infection in whom antibiotic treatment could be withheld. However, only a prospective intervention trial will prove the general safety of this limit.

Background: In rheumatoid arthritis (RA), synovial fibroblast-like cells (SF) contribute significantly to articular inflammation. They express distinct patterns of genes associated with cell proliferation and differentiation and elevated levels of cytokines and chemoattractant factors, including IL-16. Here we investigated pathways regulating IL-16 expression in fibroblasts from RA patients in comparison to fibroblasts from osteoarthritis (OA) patients. Methods: Fibroblasts were isolated from dermal and articular biopsies, expanded and pathways of IL-16 induction were investigated by real time quantitative RT/PCR, immuno blot and ELISA. Results: Stimulation of cAMP dependent signal transduction by forskolin induced prominent IL-16 RT/PCR signals in OA-DF and OA-SF. In contrast, in RA-DF and RA-SF staurosporine significantly augmented IL-16 RT/PCR signals, but forskolin induced less IL-16 transcript amounts. Activation of protein kinase C by PMA induced a significant IL-16 response only in RA-SF. Addition of IL-1β or TNF-α did not upregulate IL-16 mRNA but secretion of the mature IL-16 cytokine was activated in serum starved cells in presence of IL-1β. Conclusion: Our results suggest that RA fibroblasts differ from OA fibroblasts with respect to their sensitivities to kinase/phospatase signal transduction pathways. The enhanced expression of IL-16 in the synovial membrane early in RA vs OA may be associated in part with these distinct signaling responses.

A rapid and reliable diagnosis of respiratory syncytial virus (RSV) infection in childhood is very important for clinical management. In this study we compared a rapid antigen test (enzyme immunoassay, EIA) for the detection of RSV with a reverse transcriptase polymerase chain reaction (RT-PCR) [19-valent multiplex RT-PCR enzyme-linked immunosorbent assay (ELISA)] to assess the diagnostic performance. Furthermore the diagnostic value of the EIA in terms of age and season relation was analyzed. A total of 400 nasopharyngeal or tracheal secretions from pediatric patients with clinical signs of lower respiratory tract infection were included. The specimen had to be taken in a standardized manner within 72 h after admission. Specimens were tested in parallel with the EIA and the multiplex RT-PCR ELISA. The RT-PCR technique was used as the target assay. The EIA reached a sensitivity of 58% and a specificity of 90% for all samples tested. For patients < [corrected] 1 year the post-test probability for a positive EIA was 91% during the RSV season; a negative test result decreased disease probability from 53 to 25%. For older patients a positive test raised disease probability from 23 to 45% during the RSV season. Negative test results did not markedly change disease probability.

Curiel DT. An adenovirus vector with genetically modified fibers demonstrates expanded tropism via utilization of a coxsackievirus and adenovirus receptor-independent cell entry mechanism.

No abstract