Epidemiology and microbiology of prosthetic joint infections: a nine-year, single-center experience in Pavia, Northern Italy.

BACKGROUND: Prosthetic joint infections (PJIs) are a growing matter of concern due to their economic and social burden on health systems. In Italy, surgical data on PJIs are available in a national registry, but microbiological data are still scarce. MATERIALS AND METHODS: We performed a retrospective study at a single center with records of patients treated for primary PJIs of knee or hip from January 1, 2011, to May 30, 2018. Patients with infections of osteosynthesis means and external devices were excluded, as well as PJI recurrences and polytrauma patients. Infections were diagnosed according to IDSA and MSIS criteria. We collected data on demographics, risk factors and microbiology. All patients seen at our center undergo blood cultures and synovial fluid cultures, periarticular biopsy and prosthesis sonication by Bactosonic®. This was used only after 2014. Bacterial identification is achieved by MALDI-TOF, PHOENIX 100 and standard methods. Chi-square or Fisher tests were used to test statistical differences in proportions. RESULTS: Fifty-one patients matched our inclusion criteria. Of these, 16 (31.4%) were enrolled before 2014. The median age was 68.5 (range 22-88). The most common risk factors were obesity (34%), diabetes (21%) and chronic kidney disease (14%). Seventeen patients were diagnosed with a culture-negative PJIs (33.3%). Staphylococcus aureus was the most commonly isolated pathogen (14/51, 27.5%), followed by coagulase-negative staphylococci (7/51, 13.7%). Methicillin-resistant S. aureus rate was 28.6%. The rate of culture-negative PJIs dropped from 56 to 22% after 2014, with a significant difference between the two time periods (p = 0.016). CONCLUSIONS: The introduction of sonication dramatically increased our diagnostic accuracy. Our microbiological data are in line with those from other studies conducted in Italy.

Screening program for latent tuberculosis infection in asylum seekers - a single center experience in Pavia, Italy.

BACKGROUND: The management of Latent Tuberculosis Infection is crucial in fighting Tuberculosis worldwide, and particularly in low incidence European Countries. While guidelines for the management of Tuberculosis in newly arrived immigrants have been issued by the European Center for Disease Control and Prevention and by the National Health Authorities in Italy, these are not widely implemented yet at local level. STUDY DESIGN: We report our program for the screening of Latent Tuberculosis Infection and active Tuberculosis in asylum seekers, jointly implemented by Public Health Authorities and the Infectious Diseases Department of a tertiary care, teaching hospital in Northern Italy. METHODS: We reviewed records of the asylum seekers who were screened at our center via Tuberculin Skin Test and/or Interferon Gamma Release Assay plus chest X-ray and either treated with Isoniazid Preventive Treatment or for active Tuberculosis Disease in case of positive results. RESULTS: We screened 726 migrants, mostly males (97.3%) and from Sub-Saharan Africa (82.2%) and found a high adherence rate for both screening (98.2%) and Isoniazid Preventive Treatment (90.1%). In addition, we found seven cases of active Tuberculosis. CONCLUSIONS: Latent Tuberculosis Infection screening and treatment proved feasible in our program, which should be systematically implemented in asylum seekers reaching Europe.