The urinary microbiome of healthy individuals and the way it alters with ageing have not been characterized and may influence disease processes. Conventional microbiological methods have limited scope to capture the full spectrum of urinary bacterial species. We studied the urinary microbiota from a population of healthy individuals, ranging from 26 to 90 years of age, by amplification of the 16S rRNA gene, with resulting amplicons analyzed by 454 pyrosequencing. Mid-stream urine (MSU) was collected by the “clean-catch” method. Quantitative PCR of 16S rRNA genes in urine samples, allowed relative enumeration of the bacterial loads. Analysis of the samples indicates that females had a more heterogeneous mix of bacterial genera compared to the male samples and generally had representative members of the phyla Actinobacteria and Bacteroidetes. Analysis of the data leads us to conclude that a “core” urinary microbiome could potentially exist, when samples are grouped by age with fluctuation in abundance between age groups. The study also revealed age-specific genera Jonquetella, Parvimonas, Proteiniphilum, and Saccharofermentans. In conclusion, conventional microbiological methods are inadequate to fully identify around two-thirds of the bacteria identified in this study. Whilst this proof-of-principle study has limitations due to the sample size, the discoveries evident in this sample data are strongly suggestive that a larger study on the urinary microbiome should be encouraged and that the identification of specific genera at particular ages may be relevant to pathogenesis of clinical conditions.

The effects of the immunosuppressive drugs cyclosporin A and FK 506 were studied on cells chronically infected with human immunodeficiency virus type 1 (HIV-1) as well as on uninfected and newly infected cells. When cells chronically infected with HIV-1 or with HIV-2 were cocultivated with uninfected cells in the presence of cyclosporin A or FK 506 there was a delay in the formation of syncytia and of cytopathic effects. This inhibitory effect was not due to decreased membrane expression of CD4. In addition, there was an '100-fold reduction in the yield of infectious HIV-1 when the infected cells were grown in the presence of these drugs, a finding consistent with other evidence of decreased HIV expression. Both drugs were found to inhibit the growth of chronically infected cells at concentrations that did not inhibit the growth of the uninfected cells. These results, demonstrating that cyclosporin A and FK 506 interfere with HIV production and selectively inhibit the growth of infected cells, suggest that they may be useful in the treatment of this infection and indicate further cellular targets for antiviral agents.

Central nervous system tuberculosis (TB) was identifi ed in 20 cases of unexplained encephalitis referred to the California Encephalitis Project. Atypical features (encephalitic symptoms, rapid onset, age) and diagnostic challenges (insensitive cerebrospinal fl uid [CSF] TB PCR result, elevated CSF glucose levels in patients with diabetes, negative result for tuberculin skin test) complicated diagnosis.T uberculosis (TB) of the central nervous system (CNS) is classically described as meningitis. However, altered mental status, including encephalitis, is within the spectrum of clinical manifestations. Because early treatment can dramatically improve outcomes, consideration of TB as a potential pathogen in CNS infections, including encephalitis, is vital. The California Encephalitis Project (CEP), initiated in 1998 to study the causative agents, epidemiology, and clinical features of encephalitis, has identifi ed 20 cases of culture-confi rmed tuberculous encephalitis. In most instances, TB was not initially considered to be a likely cause. The StudyReferrals are received by the CEP statewide from clinicians seeking diagnostic testing for immunocompetent patients, including TB PCR testing when appropriate, who meet the CEP case defi nition of encephalitis (1). Mycobacterial testing was often also conducted by the referring hospital. Inclusion criteria for this report were a positive cerebrospinal fl uid (CSF) culture for Mycobacterium tuberculosis complex or a positive CSF TB PCR result. Clinical data were compiled from case history forms and other medical records when available. To evaluate differences among causes of encephalitis, TB patients were compared with CEP patients with cases of enterovirus and herpes simplex virus 1 (HSV-1) encephalitis. Demographic, clinical, and laboratory data were compared by using the Fisher exact test, χ 2 test, or Kruskal-Wallis test as appropriate (statistical signifi cance was set at α = 0.05).From June 1998 through October 2005, a total of 1,587 patients were enrolled in the CEP; 20 patients fulfi lled criteria as TB cases. Demographic and clinical information for the study population are detailed in the online Appendix Table (available from www.cdc.gov/EID/content/14/9/ 1473-appT.htm). Median age was 41 years (range 8 months to 77 years). The median time from symptom onset to fi rst lumbar puncture was 5 days (range 0-62 days). Seventeen patients (85%) had a second lumber puncture.In general, CSF values became more abnormal over time, with increasing leukocyte counts and protein levels and decreasing glucose levels (Appendix Table). Most patients had a CSF mononuclear cell predominance, although 4 patients (21%) had a neutrophil predominance. All patients had cranial neuroimaging, magnetic resonance imaging (18 of 20), and computed tomography (20 of 20) (Appendix Table; Table). Results of computed tomography scans were often normal (50%).Of patients in whom the results of a recent tuberculin skin test (TST) were known, 59% (10 of 17) had a negative result (Appendix Table). M...

The spectrum of disease caused by parvovirus B19 has been expanding in recent years because of improved and more sensitive methods of detection. There is evidence to suggest that chronic infection occurs in patients who are not detectably immunosuppressed. We report the case of a young woman with recurrent fever and a syndrome indistinguishable from chronic fatigue syndrome. After extensive investigation, we found persistent parvovirus B19 viremia, which was detectable by polymerase chain reaction (PCR) despite the presence of IgM and IgG antibodies to parvovirus B19. Testing of samples from this patient suggested that in some low viremic states parvovirus B19 DNA is detectable by nested PCR in plasma but not in serum. The patient's fever resolved with the administration of intravenous immunoglobulin.