Hospital-acquired infections and leading pathogens detected in a regional university adult acute-care hospital in Genoa, Liguria, Italy: results from a prevalence study.

BACKGROUND: A prevalence study aimed to update the epidemiological scenario of Hospital-Acquired Infections (HAI) was performed at the San Martino University Hospital of Genoa, the Regional Reference Adult-care Center in Liguria, Italy, with more than 1300 beds. MATERIALS AND METHODS: The investigation was performed in all the wards, except the Psychiatric Units, between 19th March and 6Ih April, 2007, using a one-day monitoring system for each ward. International standardized criteria and definitions for the surveillance of HAI were used for the collection of data, which were recorded in specific software for subsequent consolidation, analysis and quality control. RESULTS: The hospital infection control staff actively monitored 912 inpatients: a total of 84 HAI among 72 patients were diagnosed, with an overall prevalence of infections and affected cases of 9.2% (95% CI: 7.3-11.1) and 7.9% (95% CI: 6.1-9.7), respectively. Urinary Tract Infections (UTI) (30.9%), Respiratory Tract Infections (RTI) (28.6%) and Blood Stream Infections (BSI) (21.4%) were found to be the most frequent infections. As expected, both specific prevalence and localization of HAI varied considerably between wards, with the highest values recorded in Intensive Care Units (ICU) and in Functional Rehabilitation wards. RTI (26.3%) and BSI (13.2%) were found primarily represented in ICU, while the highest values of UTI (13.3%) were registered in Functional Rehabilitation Units. Enterococcus spp. (16.8%), Candida spp. (14%), Pseudomonas spp. (12.2), Staphylococcus aureus (10.7%), Escherichia coli (10.3%) and Coagulase-negative staphylococci (CNS) (9.3%) were the most frequent pathogens isolated. The overall rate of administration of antibiotics was 55.3% and penicillin (26.7%), cephalosporins (22.8%) and fluoroquinolones (17.9%) were found to be the leading antibacterial administered. CONCLUSION: Results of the present study have been, and are currently, used for orientating surveillance and control hospital policies, planning activities according to a rational and evidence-based approach.

Molecular epidemiology and case-control approaches for management of an outbreak of hepatitis A in Liguria, Italy.

INTRODUCTION AND METHODS: Hepatitis A remains an important public health problem in low endemicity areas, because of the social and economic high burden of cyclical outbreaks. In this study we described an outbreak of HAV infection occurred in the city of Genoa and in its proximity and the viral circulation in the post-epidemic period. In order to identify risk factors associated to the illness and to determine the source of infection and the dynamics of virus evolution, we conducted an epidemiological and molecular investigation by a case-control study and by sequence analysis of high variable regions of the genome. RESULTS: From May to October 2005, 58 HAV hepatitis cases were notified. The case-control study showed that beach establishment attending is strongly associated with HAV hepatitis (OR = 24.5, p-value < 0.01), at multivariate analysis. The profile of epidemic curve, the clinical onset of primary cases who occurred in few weeks and the geographic distribution of cases clearly indicated a common exposure to a point source: the outbreak can be probably associated with a contaminated food product dispensed in the affected area. The outbreak has been mainly caused by a single variant, confirming the common exposure to a point source; this variant previously circulated within homosexual man (MSM) network in Northern Europe. During the outbreak and in the following months, different variants originating from Southeast Asia, Southern America and Northern Africa, have co-circulated: all these cases were related to international travel and none of these had determined secondary cases. DISCUSSION: The epidemiological picture of hepatitis A in Liguria is characterized by a wide heterogeneity of circulating HAV strains. This pattern could be associated with the increase of imported cases and transmission within network of persons with similar risk factors. Molecular approach coupled to descriptive and analytical epidemiological studies appeared un-replaceable tools for management and control of HAV outbreaks, because of their capacity to recognize infection origin, transmission patterns and dynamics of virus evolution.

Cost-benefit evaluation of influenza vaccination in the elderly in the Italian region of Liguria.

Influenza causes considerable morbidity and mortality and the damage to public health can be considerable. The most effective measures available for the prevention of influenza is vaccination. In most industrialised countries the objective of vaccination is to limit the disease among individuals at risk, especially the elderly. During the winter of 2000/2001, General Practitioners (GPs) monitored 14,818 elderly individuals. The objective was to evaluate the weekly incidence of the disease. Furthermore, we carried out a prospective study on 512 elderly individuals, arranged according to vaccination (304 vaccinated and 208 non-vaccinated), with the main objective of assessing the costs of the disease and the efficacy of vaccination. Finally, in order to assess the percentage of vaccinated elderly individuals, we carried out a telephone survey on 500 subjects. Our clinical surveillance study enabled us to establish that morbidity was particularly low in elderly individuals.The results of the prospective study allowed us to estimate the cost-benefit ratio at 8.22, with a net saving of 110.20 Euros for each vaccinated subject. We were also able to establish that the vaccine coverage among elderly individuals was 63%. Our study, though carried out during a low epidemic year, confirms the economic advantage of vaccination in the elderly.