Identification of the Feline Humoral Immune Response to Bartonella henselae Infection by Protein Microarray

Background: Bartonella henselae is the zoonotic agent of cat scratch disease and causes potentially fatal infections in immunocompromised patients. Understanding the complex interactions between the host’s immune system and bacterial pathogens is central to the field of infectious diseases and to the development of effective diagnostics and vaccines. Methodology: We report the development of a microarray comprised of proteins expressed from 96 % (1433/1493) of the predicted ORFs encoded by the genome of the zoonotic pathogen Bartonella henselae. The array was probed with a collection of 62 uninfected, 62 infected, and 8 ‘‘specific-pathogen free’ ’ naïve cat sera, to profile the antibody repertoire elicited during natural Bartonella henselae infection. Conclusions: We found that 7.3 % of the B. henselae proteins on the microarray were seroreactive and that seroreactivity was not evenly distributed between predicted protein function or subcellular localization. Membrane proteins were significantly most likely to be seroreactive, although only 23 % of the membrane proteins were reactive. Conversely, we found that proteins involved in amino acid transport and metabolism were significantly underrepresented and did not contain any seroreactive antigens. Of all seroreactive antigens, 52 were differentially reactive with sera from infected cats, and 53 were equally reactive with sera from infected and uninfected cats. Thirteen of the seroreactive antigens were found to be differentially seroreactive between B. henselae type I and type II. Based on these results, we developed a classifier algorith

Factors Associated with Revision Surgery after Internal Fixation of Hip Fractures

Background: Femoral neck fractures are associated with high rates of revision surgery after management with internal fixation. Using data from the Fixation using Alternative Implants for the Treatment of Hip fractures (FAITH) trial evaluating methods of internal fixation in patients with femoral neck fractures, we investigated associations between baseline and surgical factors and the need for revision surgery to promote healing, relieve pain, treat infection or improve function over 24 months postsurgery. Additionally, we investigated factors associated with (1) hardware removal and (2) implant exchange from cancellous screws (CS) or sliding hip screw (SHS) to total hip arthroplasty, hemiarthroplasty, or another internal fixation device. Methods: We identified 15 potential factors a priori that may be associated with revision surgery, 7 with hardware removal, and 14 with implant exchange. We used multivariable Cox proportional hazards analyses in our investigation. Results: Factors associated with increased risk of revision surgery included: female sex, [hazard ratio (HR) 1.79, 95% confidence interval (CI) 1.25-2.50; P = 0.001], higher body mass index (fo

Clinical and Socioeconomic Factors Influence Treatment Decisions in Graves’ Disease

BACKGROUND: Definitive treatment of Graves' disease includes radioactive iodine (RAI) and thyroidectomy, but utilization varies. We hypothesize that, in addition to clinical reasons, there are socioeconomic factors that influence whether a patient undergoes thyroidectomy or RAI. METHODS: Patients treated for Graves' disease between 8/2007 and 9/2013 at our university hospital were included. A comparative analysis of clinical and socioeconomic factors was completed. RESULTS: Of 427 patients, 300 (70%) underwent RAI while 127 (30%) underwent surgery. Multiple factors were associated with surgery: younger age (mean 36 vs. 41 years old, p<0.01), female gender (33% vs. 19% males, p=0.01), black race (56% vs. 28% non-black, p<0.01), Medicaid or uninsured (43% vs. 27% private insurance or Medicare, p<0.01), ophthalmopathy (38% vs. 26%, p< 0.01), goiter (35% vs. 23%, p<0.01), lowest quartile of median household income (38% vs. 27% upper three quartiles, p=0.03). Thyroidectomy increased annually, with 52% undergoing surgery during the final year (p<0.01). Adjusting for confounding, younger age (OR 1.04; 95% CI 1.02, 1.05), female gender (OR 2.06; 95% CI 1.06, 4.01), ophthalmopathy (OR 2.35; 95% CI 1.40, 3.96), and later year of treatment (OR 1.66; 95% CI 1.41, 1.95) remained significantly associated with surgery. CONCLUSIONS: Surgery has now become the primary treatment modality of choice for Graves' disease at our institution. Clinical factors are the main drivers behind treatment choice, but patients with lower SES are more likely to have clinical features best treated with surgery, underlying the importance of improving access to quality surgical care for all patients