Control of carbapenemase-producing Klebsiella pneumoniae: a region-wide intervention.

Starting in 2010, there was a sharp increase in infections caused by Klebsiella pneumoniae resistant to carbapenems in the Emilia-Romagna region in Italy. A region-wide intervention to control the spread of carbapenemase-producing K. pneumoniae (CPKP) in Emilia-Romagna was carried out, based on a regional guideline issued in July 2011. The infection control measures recommended to the Health Trusts (HTs) were: phenotypic confirmation of carbapenemase production, active surveillance of asymptomatic carriers and contact isolation precautions for carriers. A specific surveillance system was activated and the implementation of control measures in HTs was followed up. A significant linear increase of incident CPKP cases over time (p<0.001) was observed at regional level in Emilia-Romagna in the pre-intervention period, while the number of cases remained stable after the launch of the intervention (p=0.48). Considering the patients hospitalised in five HTs that provided detailed data on incident cases, a downward trend was observed in incidence after the release of the regional guidelines (from 32 to 15 cases per 100,000 hospital patient days). The spread of CPKP in Emilia-Romagna was contained by a centrally-coordinated intervention. A further reduction in CPKP rates might be achieved by increased compliance with guidelines and specific activities of antibiotic stewardship.

Increasing hepatitis B vaccination coverage among healthcare workers in Italy 10 years apart.

BACKGROUND: In Italy, vaccination against hepatitis B virus infection was strongly recommended for healthcare workers since 1985. Update findings on vaccination coverage are lacking. AIM: To assess current vaccination coverage against hepatitis B in this job category. METHODS: In 2006, 1,632 healthcare workers randomly selected in 15 Italian public hospitals completed a self-administered precoded questionnaire. RESULTS: The overall vaccination coverage was 85.3%, a figure higher than the 64.5% observed in 1996. Vaccine coverage showed a significant downtrend (p<0.01) from the Northern (93.1%) to the Southern (77.7%) areas. Logistic regression analysis showed that residence in the North (Odds ratio 4.2; 95% confidence interval 2.6-6.7) and youngest age (Odds ratio 4.5; 95% confidence interval 2.6-7.8), both were independent predictors of vaccine acceptance. CONCLUSIONS: Ten years apart, vaccine coverage has markedly increased, closely paralleling the downtrend in the incidence of acute B hepatitis among healthcare workers in Italy.

Prevalence of infected patients and understaffing have a role in hepatitis C virus transmission in dialysis.

To assess hepatitis C virus (HCV) incidence rates and identify determinants of infection among hemodialysis patients, a multicenter study was conducted in 58 units in ITALY: An initial seroprevalence survey was conducted among 3,492 patients already on hemodialysis therapy as of January 1997 and among an additional 434 patients who began dialysis up to January 1998. HCV antibodies were assessed by third-generation enzyme immunoassays. Patients testing seronegative at baseline were enrolled into a 1-year incidence study with serological follow-up at 6 and 12 months. For patients who seroconverted, an HCV RNA assay was performed on stored baseline samples to confirm new infection. A nested case-control study was subsequently performed to investigate potential risk factors. For each incident case, three controls negative for both HCV antibodies and HCV RNA were randomly selected. At enrollment, HCV seroprevalence was 30.0%. During follow-up, 23 new HCV cases were documented, with a cumulative incidence of 9.5 cases/1,000 patient-years. By logistic regression analysis, an increased risk for HCV infection emerged for patients attending the dialysis units with a high prevalence of HCV-infected patients at baseline (odds ratio [OR], 4.6) and for those attending units with a low personnel-patient ratio (OR, 5.4). Among extradialysis factors, a history of surgical intervention in the previous 6 months (OR, 16.7) significantly increased HCV risk. These findings suggest that the combination of understaffing and a high level of infected patients in the dialysis setting increases the risk for HCV nosocomial transmission. This is likely related to an increased likelihood for breaks in infection control measures.

Microscopic evaluation of bone-implant contact between hydroxyapatite, bioactive glass and tricalcium phosphate implanted in sheep diaphyseal defects.

In order to compare morphological discrepancies in bone-implant contact in vertebrates, cylinders of hydroxyapatite, bioactive glass and tricalcium phosphate were implanted in segmental defects of the tibia in sheep. Three types of visible bone-implant contact were observed microscopically at 4 months after implantation. The trabecular web-like bone-implant contact noted in tricalcium phosphate seemed superior to the disseminated patchy bone-implant contact in bioactive glass and the buttressed bone-implant contact in hydroxyapatite with respect to both bone ingrowth and bioresorption of the implant. Differences of physicochemical properties on the surface among the three kinds of bioceramic implants probably give rise to different types of bone-implant contact.

Case fatality rate of acute viral hepatitis in Italy: 1995-2000. An update.

BACKGROUND: Fulminant hepatic failure is the most serious complication of viral hepatitis. Although this event occurs rarely, it may be fatal. AIMS: To evaluate the case fatality rate (several deaths divided by number of cases x 100) for each viral hepatitis type in Italy from 1995 to 2000. PATIENTS: Acute hepatitis cases identified by the surveillance system for acute viral hepatitis, which covers approximately 58% of the Italian population. RESULTS: Twenty-five deaths (0.1%) occurred among the 18 460 acute viral hepatitis cases observed from 1995 to 2000, a rate threefold lower than the 0.3% reported during the period 1985-1994. The highest case fatality rate (0.4%) was seen for acute hepatitis B (18 deaths among 4257 cases). Only one death (0.01%) occurred among the 11 063 acute hepatitis A cases and two deaths (0.1%) among the 1536 acute hepatitis C cases. No deaths were observed among the 309 acute hepatitis A cases superimposed on chronic HBsAg carriers and the 166 superimposed on chronic HCV carriers. Intravenous drug use (22.2% of cases) and other parenteral exposures (22.2% of cases) were the most frequent non-mutually exclusive sources of infection reported by subjects who died of acute hepatitis B. CONCLUSIONS: Analysis of surveillance system data from 1995 to 2000 indicates that, in Italy, deaths due to acute viral hepatitis are rare, but most commonly observed with acute hepatitis B. There is no evidence that acute hepatitis A may be fatal in chronic HBsAg or HCV carriers. The overall better survival rate may probably reflect improvements in the treatment of fulminant hepatitis in the last few years in Italy.

Changing epidemiology of parenterally transmitted viral hepatitis: results from the hepatitis surveillance system in Italy.

BACKGROUND: In 1991, compulsory hepatitis B virus vaccination and screening for anti-hepatitis C virus of blood banks were introduced in Italy. AIM: To evaluate the impact of preventive measures on the incidence and risk factors for parenterally transmitted viral hepatitis. METHODS: Data from the surveillance system for acute viral hepatitis for the period 1985-99 were used. Temporal trends in distribution of reported risk factors were analysed by comparing three-year periods: 1987-89 and 1997-99. RESULTS: The incidence (no. cases per 100,000 population) of hepatitis B was 12 in 1985 and 3 in 1999; the incidence of hepatitis non-A, non-B decreased from 5 to 1 in the same period. These decreases were more evident among young adults and before rather than after 1991. Multiple sexual partners, other parenteral exposures and dental treatment remain the most common risk factors for parenterally transmitted viral hepatitis. An increase in frequency over time was observed for other parenteral exposures, whereas a marked decrease was evident for blood transfusion and household contact with an HB-sAg carrier. Invasive medical procedures continue to represent an important source of infection. Intravenous drug use was reported particularly by young adults with non-A, non-B hepatitis, with increased frequency over time. CONCLUSIONS: Non-immunologic measures for preventing hepatitis B and non-A, non B due to iatrogenic and other parenteral exposures, combined with hepatitis B virus vaccination, could further reduce parenteral transmission.

Risk management of HBsAg or anti-HCV positive healthcare workers in hospital.

Recommendations are made for controlling the transmission of the hepatitis B and hepatitis C viruses from healthcare workers to patients. These recommendations were based both on the literature and on experts' opinions, obtained during a Consensus Conference. The quality of the published information and of the experts' opinions was classified into 6 levels, based on the source of the information. The recommendations can be summarised as follows: all healthcare workers must undergo hepatitis B virus vaccination and adopt the standard measures for infection control in hospitals; healthcare workers who directly perform invasive procedures must undergo serological testing and the evaluation of markers of viral infection. Those found to be positive for: 1) HBsAg and HBeAg, 2) HBsAg and hepatitis B virus DNA, or 3) anti-hepatitis C virus and hepatitis C virus RNA must abstain from directly performing invasive procedures; no other limitations in their activities are necessary. Infected healthcare workers are urged to inform their patients of their infectious status, although this is left to the discretion of the healthcare worker; whose privacy is guaranteed by law. If exposure to hepatitis B virus occurs, the healthcare worker must undergo prophylaxis with specific immunoglobulins, in addition to vaccination.

A novel method for isolation of Brachyspira (Serpulina) hyodysenteriae from pigs with swine dysentery in Italy.

Brachyspira (Serpulina) hyodysenteriae was isolated from 10 of 11 pigs with clinically suspected swine dysentery in six herds in northern Italy. All strains were successfully isolated in the selective blood agar modified medium with spectinomycin and rifampin (BAM-SR) currently used in our laboratory to isolate B. (S.) pilosicoli of human origin, after pre-treatment of intestinal material with spectinomycin and rifampin in foetal calf serum. Isolates had phenotypic characteristics typical of B. (S.) hyodysenteriae.

Lumbar isthmic spondylolisthesis in children and adolescents. Radiologic evaluation and results of operative treatment.

A clinical and radiologic follow-up study of a group of 75 children and adolescents, comprised of both boys and girls, who underwent spondylodesis for spondylolisthesis between the years 1979 and 1984 is reported. Sagittal rotation, lumbosacral joint angle, lumbar lordosis, wedging of olisthetic vertebrae, and the rounding of the upper sacrum showed considerable statistical correlation to the amount of slipping and accordingly should be noted when estimating the risk of progression of the spondylolisthesis. When the spondylolisthesis was accompanied by scoliosis, it was noted that seriousness of the former was closely correlated to that of the latter. Most patients profited by the operation, and solid fusion was achieved in almost all cases. The posterolateral spondylolysis performed using graft from the iliac crest, the interbody fusion technique, or their combination turned out to be the most reliable surgical methods. The combined technique was especially required in cases with a high degree of slipping.

Peripheral neuropathy associated with hypereosinophilia.

Three patients with hypereosinophilia showed different forms of peripheral neuropathy: severe polyneuropathy of prevalently sensory type (case 1), mild sensory neuropathy (case 2), acute mononeuropathy of the median nerve with subclinical polyneuropathy (case 3). Hypereosinophilia was probably idiopathic, however the presence of atypical findings suggested transition to vasculitides or collagen disease. Sural nerve biopsy in cases 1 and 2 showed features of axonopathy in both, although of different severity, reflecting the variability of clinical involvement and, probably, heterogeneous pathogenic mechanisms. Peripheral nerve involvement associated with hypereosinophilia may be related to neurotoxicity of eosinophils, or to vascular damage.

Detection of same sized 4.3 Kb extrachromosomal DNA elements in weakly beta-haemolytic human intestinal spirochaetes and Serpulina pilosicoli of swine origin.

Agarose gel electrophoresis of total DNA from Italian strains of weakly beta-haemolytic human intestinal spirochaetes (w beta HIS) and porcine Serpulina pilosicoli reference strain P43/6/78 showed an extrachromosomal band having the same size and migrating at 4.3 Kb. The same results were observed after agarose gel electrophoresis of DNA obtained from the supernatant fluids of the spirochaetal cultures analysed. Swine Serpulina hyodysenteriae reference strain P18A was comparatively analysed and a 6.5 Kb extrachromosomal DNA element was found, as expected. Furthermore, S. hyodysenteriae reference strain P18A differed from all the other spirochaetes tested and had a higher number of flagella (8-12) at each cell end and was strongly beta-haemolytic. To the best of our knowledge, this is the first report on the detection of a band of extrachromosomal DNA having the same size in w beta HIS and S. pilosicoli from swine origin.

Weakly beta-haemolytic human intestinal spirochaetes antagonize the haemolytic activity of Clostridium perfringens alpha-toxin producer.

The production of haemolytic antagonism between weakly beta-haemolytic human intestinal spirochaetes (wbetaHIS) related to human intestinal spirochaetosis and Clostridium perfringens alpha-toxin producer was investigated. A reduction of the clostridial haemolytic activity and a distortion of the haemolytic halo of clostridial alpha-toxin surrounded by a small zone of poorly cooperative haemolysis was clearly observed on the level of the spirochaetal growth area when 40 out of 41 wbetaHIS were cultivated in sheep blood agar plates together with Clostridium perfringens alpha-toxin producer. This phenomenon of haemolytic antagonism was observed only when wbetaHIS grew 72-96 hours sooner than C. perfringens and after the inoculum of the latter at a distance of 0 to 10 mm from wbetaHIS the plates were anaerobically incubated for an additional 48 hours and the bacteria were used at concentrations ranging from 10(7) to 10(4) CFU/ml. These results were also observed between C. perfringens and weakly beta-haemolytic intestinal spirochaetes related to animal intestinal spirochaetosis including avian strains and Brachyspira (Serpulina) pilosicoli of porcine origin.

Brachyspira (Serpulina) pilosicoli of human origin interfere with the growth of Clostridium perfringens alpha-toxin producer.

Brachyspira (Serpulina) pilosicoli of human origin interfere with the growth of Clostridium perfringens alpha-toxin producer reducing the clostridial growth area and colonies number when bacteria were cultivated together in sheep blood agar plates. The growth inhibition of C. perfringens was only observed when B. (S.) pilosicoli grew 72-96 hours sooner than C. perfringens and after the inoculum of this latter the plates were anaerobically incubated for additional 48 hours. The phenomenon was observed at concentrations of B. (S.) pilosicoli ranging from 10(7) to 10(4) CFU/ml and at concentrations of C. perfringens ranging from 10(7) to 10(1) CFU/ml when the bacteria were 0-10 mm away from each other. When B. (S.) pilosicoli and C. perfringens were inoculated at the same time and when B. (S.) pilosicoli grew 24-48 hours sooner than C. perfringens, the clostridial growth inhibition was not appreciated and only a cooperative haemolysis was observed between the bacteria.

Brachyspira (Serpulina) pilosicoli of human origin interfere with the haemolytic activity and the growth of Staphylococcus aureus beta-toxin producer.

Brachyspira (Serpulina) pilosicoli related to intestinal spirochaetosis were found to interfere in vitro with the haemolytic activity and the growth of Staphylococcus aureus beta-toxin producer. This interference was clearly appreciated because a reduction of the zone of the staphylococcal beta-toxin activity, the reduction and/or absence of cooperative haemolysis between bacteria, and the growth reduction of S. aureus were observed when B. (S.) pilosicoli were grown 72-96 hours sooner than S. aureus and after the inoculum of the latter the plates were anaerobically incubated for additional 48-72 hours. The phenomenon was more clearly observed when B. (S.) pilosicoli had a concentration of 8x10(6)-8x10(7) CFU/ml and S. aureus at a concentration ranging from 10(7) to 10(1) CFU/ml was inoculated at a distance from the streaks of B. (S.) pilosicoli ranging from 0-10 mm. When B. (S.) pilosicoli and S. aureus were inoculated at the same time and when B. (S.) pilosicoli grew 24-48 hours sooner than S. aureus only a cooperative haemolysis was observed.

A device to study the effect of space radiation on photosynthetic organisms.

This research concerns the study of the effects of ionising space radiation on the oxygen-evolving activity of algae and cyanobacteria, focusing our attention on Photosystem II (PS-II), the oxygen-evolving complex. These microorganisms as higher plants, can use light energy to split water molecules and evolve oxygen in a process that produce storable energy-rich products from atmospheric carbon dioxide. Algae and cyanobacteria which can grow in the presence of nutrients and carbonate are expected to be utilised to maintain an oxygen-atmosphere and to constitute biomass in space shuttles. Irradiation was performed in gamma 60Co-sources of different activities; fluorescence techniques in vivo and SDS-PAGE analysis in vitro were used to determine PS-II efficiency during radiation stress. We determined the radiation target on PS-II by immunoblot. We built a miniaturised growth box that preserves constant pressure and temperature to measure automatically photosynthetic activity by a fluorescence sensor, directly in space during a mission in an ASI balloon.

The Marchetti-Vincenzi universal bundle nail for the treatment of tibial nonunion.

The authors report the results obtained in the treatment of 9 cases of uninfected hypertrophic or atrophic nonunion of the tibial diaphysis, using the Marchetti-Vicenzi Universal Bundle Nai. Lesions consisted in the sequelae of different types of diaphyseal fractures treated by means of several surgical procedures. Former fixation material was removed in all of the cases, the tibial medullary canal was reamed, and the Marchetti-Vicenzi Universal Bundle Nail was used for internal fixation. In some cases, additional procedures were used such as Osteomuscular Decortication (DOM) according to Judet, autologous bone grafting. All of the cases healed after a mean time of 22 weeks. The authors suggest that intramedullary nailing using the universal bundle nail is a reliable and safe procedure for the treatment of uninfected tibial nonunion.

[The quantification of tuberculous disease in an Italian area and the estimation of underreporting by means of record linkage]. / Quantificazione della malattia tubercolare in un'area italiana e stima della sottonotifica tramite record linkage.

The description and interpretation of tuberculosis spatial and temporal variations in Italy is rather difficult because of well-grounded suspicions of disease underestimation, related with the bad working of the compulsory notification system. In this study, the record-linkage technique was used to estimate the proportion of TB undernotification in an Italian area, in order to give a first quantitative estimate of tuberculosis at a geographical level. The area considered was the Local Health Agency of Florence (population in 1994: 803,588) in 1995. Information for record-linkage was taken from: the Regional TB Archive, Hospital Discharge files, Laboratories, Pathology Departments, the Regional AIDS Registry, the Regional Mortality Registry. The linkage among the different sources was based on first and last name, date and place of birth, or only on first and last name for the laboratories. Prevalent cases and relapses were excluded through comparison with various historical archives. Most cases signalled only in hospital discharges were re-evaluated through original medical records. In such a way, the original sample was reduced from 690 to 182 cases incident in 1995, diagnosed in the area considered, and mostly resident in the same area. Among these cases, 98 (53.8%) were unknown to the compulsory notification system. The most of them come from hospital departments (27 cases) and from laboratories (47 cases). Fourty-nine of the unknown cases concerned pulmonary TB. The notification rate in the area moves then from 10.5/1000 to 22.7/1000.