Health conditions of migrants landed in north-eastern Sicily and perception of health risks of the resident population.

OBJECTIVES: In Italy, a recent irregular movement of people raised concerns among the host population on possible introduction of diseases that have long been controlled in the host countries. This study evaluates the health conditions of illegal immigrants landed on the north-eastern Sicilian territory, to provide information on the clinical and epidemiologic burden of infectious diseases among migrants and how the local population feel about these landings. STUDY DESIGN: The study design is a cross-sectional study. METHODS: The study considered all migrants landed illegally in the city of Messina, Sicily, between January 2014 and July 2018. Analysing the data of hospital admissions and disease notifications, we calculated the frequency of infectious diseases among migrant population. Furthermore, through a survey conducted by a well-known online newspaper, we analysed the perception that the local population has about the health risk represented by migrants. RESULTS: In the considered five-year period, 108 landings, for a total of 38,608 migrants occurred at the Messina port. The percentage of hospitalisation was rather low (3.5%), and it concerned mainly pregnant women. The notifications of infectious diseases were contained, with exception of scabies and tuberculosis. Finally, from the online survey, resulted that there is a large part of local population that considers migrants a potential danger to community health. CONCLUSIONS: Our data show that the presence of migrants should not have to date any impact on the health conditions of the resident population. However, monitoring over time the health of migrants and screening for infectious diseases as soon as possible after landing are advantageous for both migrants and host country.

GSTP1 gene methylation and AHR rs2066853 variant predict resistance to first generation somatostatin analogs in patients with acromegaly.

PURPOSE: Biomarkers of clinical and therapeutic outcome in acromegaly are needed. Polymorphisms or epigenetic changes of detoxification genes, such as those coding for the aryl hydrocarbon receptor (AHR) and the glutathione-S-transferase-P1 (GSTP1), could have a role in GH secreting pituitary tumors' pathophysiology and clinical expression. In this study, we assessed the contribution of GSTP1 gene promoter methylation status, per se or in combination with the occurrence of the AHR gene rs2066853 variant, on clinical features and response to somatostatin analogs (SSA) treatment in acromegaly patients. METHODS: This is an observational, retrospective study, carried out in the Endocrine Unit of an Italian University Hospital. We enrolled 77 wild-type AIP gene acromegaly patients, who have been screened for germline AHR rs2066853 variant and GSTP1 gene promoter methylation. Clinical and biochemical parameters were compared after patients' stratification according to GSTP1 methylation status and the presence of AHR rs2066853. We also evaluated the response to SSA treatment in 71 cases. RESULTS: 17 patients carried the AHR rs2066853 variant and 26 had methylated GSTP1 (GSTP1-methyl) gene promoter. GSTP1-methyl patients showed a higher prevalence of diabetes mellitus (p = 0.01), colonic polyps (p = 0.05), and were more resistant to SSA (p = 0.02) as compared to GSTP1 unmethylated patients (GSTP1-unmethyl). Patients GSTP1-unmethyl and AHR wild-type were the most sensitive to SSA treatment, while those with both GSTP1-methyl and AHR rs2066853 variant were all resistant to SSA (p = 0.01). CONCLUSIONS: In acromegaly, GSTP1 gene methylation associates with resistance to SSA treatment, especially in patients carrying also the AHR rs2066853 variant, and with increased prevalence of colonic polyps and diabetes mellitus.

Evaluation of Vaccination Coverages in the Health Care Workers of a University Hospital in Southern Italy.

INTRODUCTION: An adequate immunization of the health care workers is essential for infection prevention and control, to avoid consequences not only for them, but for all patients that the health care workers could infect causing serious damage and / or death. Unfortunately, to date, despite the presence of international and national guidelines (Law Decree 119/2017), the vaccination coverage was low, also because of the "vaccine hesitancy" spread among the same health care workers. In light of the above, the aim of our study was to investigate the vaccination coverage of healthcare workers of all the operational units present in our hospital and to evaluate differences between sex, age, professional profile and area of work. MATERIALS AND METHODS: A study was conducted from March to June 2018 to investigate the vaccination coverage of healthcare workers at the University hospital "G. Martino" of Messina; data were collected using a self-completion questionnaire based on Attachment 3 of Ministerial Circular 25233 of 18 August 2017. We verified any possible association between physicians and pediatricians and between age classes by the chi square method. Also, a logistic regression was used for each vaccination, considering the vaccination as the variable and the following covariates: type of operative unit, sex, age and area) in order to predict the probability of vaccination. RESULTS: We analyzed a sample of 822 health care workers (324 males and 498 females with an age of 49.5 ± 10.5 SD). The sample was made up of physicians (36%), nurses (21%) and other professional categories (43%). Analyzing the data we obtained vaccination coverages lower than the target required to guarantee "herd immunity"; higher vaccination coverages were found for females, physicians and the clinical area and - for influenza vaccination - in the older age groups and - for all the other vaccinations - in the younger groups. CONCLUSION: Data analysis revealed a lax attitude towards vaccinations by health care workers and the need for measures aimed at increasing vaccination their coverage to prevent them from becoming a source of dangerous outbreaks.

Measles outbreak from February to August 2017 in Messina, Italy.

INTRODUCTION: Measles continues to be a major public health issue worldwide, with high morbidity and mortality rates. The disease remains endemic in 14 European countries, including Italy where, from 2013 to 2016, over 5,000 cases have been reported. In 2017, many Italian regions, including Sicily, have reported many cases of measles. In this study, we described the latest measles outbreak in the city of Messina, from 1st February to 31st August 2017. METHODS: We considered all reported measles cases that came to the "Public Health, Epidemiology and Preventive Medicine" Operative Unit of the Messina Provincial Health Agency Prevention Department, which receives all reported cases of measles in the Messina province. RESULTS: From 1st February to 31st August 2017, a total of 59 measles cases were reported, of which 44 were confirmed, nine were classified as possible, four were probable and two cases were discarded. Of the 57 possible, probable and confirmed cases, 31 (54%) were males and 26 (46%) were females. Moreover, 54 (95%) had not been previously vaccinated while the remaining cases had documented evidence of one (two cases) or two doses (one case). Genotype B3 was identified in 39/44 cases (88,6%) by the regional reference laboratory in Palermo. CONCLUSIONS: Despite the development of an effective vaccination, unfortunately measles continues to threaten the lives of millions of children worldwide each year. The suboptimal immunization level in Italy has led to an increase in the transmission of measles with detrimental effects on both public health and ongoing measles elimination efforts.

Epidemiological HIV infection surveillance among subjects with risk behaviours in the city of Messina (Sicily) from 1992 to 2015.

INTRODUCTION: Epidemiological studies are a key element in determining the evolution and spread of HIV infection among the world population. Knowledge of the epidemiological dynamics improves strategies for prevention and monitoring. METHODS: We examined 2,272 subjects who voluntarily underwent HIV testing from January 1992 to December 2015. For each subject, an anonymous form was completed to obtain information on personal data, sexual habits and exposure to risk factors. RESULTS: The number of subjects undergoing the screening test has increased over the years and the average age of the tested subjects has decreased over time. The main motivation for undergoing HIV testing is unprotected sex. Although heterosexual subjects taking the test were more numerous than homosexuals in this study, an increase in the latter over time should be highlighted. CONCLUSIONS: Although the number of tests performed has increased over the years, the persistence of unprotected sex shows an inadequate perception of risk. Therefore, it is necessary to implement programmes to increase the general awareness of HIV infection. It is also essential to undertake constant monitoring of behaviour, risk perception and the application of the screening test via surveillance systems in order to implement effective and efficient prevention.

Knowledge of sexually transmitted infections among younger subjects of the city of Messina (Sicily).

INTRODUCTION: Sexually transmitted infections (STIs) are considered a serious public health problem worldwide, affecting especially young people. The international monitoring data indicate that 70% of patients with STIs are aged between 15 and 24 years and the World Health Organization estimates that one out of 20 teenagers contracts an STI each year. We wanted to evaluate, through this work, what high school students of Messina know about the STIs. MATERIAL AND METHODS: From February to May 2013 questionnaires were distributed to students of the last three classes of seven high schools, three of which belonging to humanistic area and four to technical area. The completed questionnaires collected were 1588. RESULTS AND DISCUSSION: The investigation carried out showed a better knowledge of the STIs by students of humanistic schools than students of technical-scientific schools, the percentage of correct answers was 74% and 60% respectively; this probably also depends on the family context, in fact, there is a statistically significant correlation between the percentage of correct answers and parents education level. Young people have a limited knowledge on the subject. We concluded our work by stressing the importance and the need to deepen and improve the training and information of the medical staff teachers and families, as it is from their knowledge and their ability to provide complete and accurate information about the risks posed by STIs that can derive knowledge and choices of appropriate lifestyle between the youth population.

Adherence of Aeromonas hydrophila strains to human enterocyte-like cells pre-infected with rotavirus.

INTRODUCTION: The interest grown in these years about emerging pathogens in the onset of intestinal disease showed that the pathogenic mechanism is a multifactorial event. Our objective was to evaluate the role of co-infection with rotavirus in the expression of Aeromonas spp adhesiveness. METHODS: The rate of co-infection involves contact of Caco-2 cells with the virus, followed by adsorption for 1 and 2 hours. Aliquots of bacterial suspensions were added to tissue-culture plates. After infection, cell monolayers were lysed; serially diluted lysates were plated to determine the number of bound bacteria by performing colony forming units (CFU) counts. RESULTS: Non-adhesive strains were not subject to variations resulting from co-infection, while those who had medium or high adhesiveness gave rise to an increase of the same. DISCUSSION: Infection with rotavirus promotes the Aeromonas ability to adhere to Caco-2 cells and this effect depends on the duration of infection and on the starting adhesiveness of bacteria strain.

Detection of human papillomavirus E6/E7 mRNA in women with high-risk HPV types 16, 18, 31, 33 and 45 which are associated with the development of human cervical cancer.

PURPOSE OF INVESTIGATION: The aim of our study was to increase the clinical meaningfulness of the virological data through mRNA E6/E7 oncoprotein identification, and to find a correlation between codon 72 polymorphism of the p53 gene and integration of HPV in host cell genomes. METHODS: We analyzed 80 cervical samples from women with HPV DNA types 16, 18, 31, 33 and 45. Transcripts of HPV were detected by the NucliSense EasyQ HPV assay and genotyping of the TP53 polymorphism was conducted using a TaqMan assay. RESULTS: Twenty percent of 80 tested samples were positive for mRNA Papillomavirus. The frequency of Arg/Pro heterozygotes in controls was over-represented compared with mRNA positive samples while there were no significant differences in the distribution of Pro/Pro and Arg/Arg alleles. CONCLUSION: The introduction of HPV mRNA testing in clinical analysis improved diagnostic accuracy of HPV infections. Our data suggest that a structural difference at codon 72 of the p53 gene may not be a sufficient risk factor for cervical carcinogenesis.

Knowledge of sexually transmitted infections and risky behaviours: a survey among high school and university students.

INTRODUCTION: STIs are a serious public health problem. Worldwide, 500 million people a year acquire a STI, and young are the most affected. METHODS: This study was conducted administering an anonymous questionnaire to 1228 Sicilian students of high school and university. RESULTS: The students had variable understanding of STIs and their complications. The results demonstrate an extreme variability in the knowledge of STIs. Multiple linear regression showed that sexual health knowledge was associated with age and sexual orientation. CONCLUSIONS: Our results show that knowledge of STIs is poor and inadequate. This finding can put students at risk of STIs.

Vaccination coverage in healthcare workers: a multicenter cross-sectional study in Italy.

INTRODUCTION: In recent years, a phenomenon known as "vaccine hesitancy" has spread throughout the world, even among health workers, determining a reduction in vaccination coverage (VC).A study aimed at evaluating VC among healthcare workers (HCWs) in 10 Italian cities (L'Aquila, Genoa, Milan, Palermo, Sassari, Catanzaro, Ferrara, Catania, Naples, Messina) was performed. MATERIALS AND METHODS: Annex 3 of the Presidential Decree n. 445 of 28 December 2000 was used to collect information on the vaccination status of HCWs. The mean and standard deviation (SD) were calculated with regard to the quantitative variable (age), while absolute and relative frequencies were obtained for categorical data (sex, professional profile, working sector, vaccination status). The connection between VC and the categorical variables was evaluated by chi-square method (statistical significance at p < 0.05). The statistical analyses were performed by SPSS and Stata software. RESULTS: A total of 3,454 HCWs participated in the project: 1,236 males and 2,218 females.The sample comprised: physicians (26.9%), trainee physicians (16.1%), nurses (17.2%) and other professional categories (9.8%). Low VC was generally recorded. Higher VC was found with regard to polio, hepatitis B, tetanus and diphtheria, while coverage was very low for measles, mumps, rubella, pertussis, chickenpox and influenza (20-30%). CONCLUSIONS: This study revealed low VC rates among HCWs for all the vaccinations. Measures to increase VC are therefore necessary in order to prevent HCWs from becoming a source of transmission of infections with high morbidity and/or mortality both within hospitals and outside.

Seroprevalence study on the diffusion of the West Nile virus among blood donors, healthcare workers, jockeys, grooms and fowlers, veterinary surgeons and hunters in Messina (Italy).

INTRODUCTION: West Nile virus (WNV) is a mosquito-transmitted flavivirus widely distributed in Africa, Middle East, Asia, Southern Europe and in 1999 was first identified in the United States as a cause of disease in New York City. It mainly circulates among birds, but can infect many species of mammals. Epidemics can occur in rural as well as urban areas. METHODS: 1,280 sera were collected during 2006 from 80 stable workers, as jockey and grooms, 100 fowlers, 500 blood donors, 600 healthcare workers, 100 veterinary surgeons and 100 hunters in the Messina province to evaluate the prevalence of the WNV infection, by ELISA test, in relation to risk exposure or not. RESULTS: None of the 1280 subjects examined has shown positive for antibodies anti WN virus. CONCLUSION: Among the strategies of control and surveillance, finally, in our opinion, are and will be indispensable the programs of continuous antibody survey in all the risk categories and in the general population in order to succeed to preview which effects could have the presence of infections from WNV, also imported from other zones where the virus is constantly present, in future and which it could be the impact of geographic factors on the epidemic spread of the disease.

Serum interleukin-6 levels are increased in HIV-infected patients that develop autoimmune disease during long-term follow-up.

BACKGROUND: Elevated IL-6 levels have been associated with both autoimmune diseases and treated HIV-seropositive (HIV+) subjects. However, few data on classic and trans-signaling IL-6 in autoimmune thyroid diseases and HIV+ subjects developing autoimmune disorders are currently available. MATERIALS AND METHODS: A total of 102 patients were included in the study. They were subdivided into two groups. Group A consisted in 51 HIV+ patients, who were followed-up for a period of five years in search of possible occurrence of autoimmune diseases. Ten of them, treated with antiretroviral therapy (ART), developed an autoimmune disorder, namely Hashimoto's thyroiditis, and psoriasis. Group B consisted in 51 patients affected by Hashimoto's thyroiditis (HT). Serum levels of the free form of IL-6 were analyzed by ELISA in all patients and for HIV+ patients at the beginning of the follow-up, before initiation of ART. RESULTS: Mean serum levels of IL-6 were similar in Group A and in Group B. In Group B, IL-6 levels showed a 5.8% increase compared with assay minimum detectable dose corresponding to 1% of full serum IL-6 level. However, serum levels of free IL-6 were increased in those HIV+ patients who developed autoimmune disorders (5.8±2.8pg/ml) and in these patients, the highest levels of free IL-6 correlated with age and CD4 cellular counts. CONCLUSIONS: The present study indicates a correlation between serum free IL-6 levels and the occurrence of autoimmune disease in HIV+ population, treated with ART during a long-term follow-up. The increased levels of serum free IL-6 were observed before ART treatment was initiated, indicating that IL-6 measurement in such patients may represent an early predictor of development of autoimmune disease.

Hepatitis C-related hepatocellular carcinoma: diagnostic and therapeutic management in HIV-patients.

The efficacy of the current HIV therapy has led to increased survival and prolongation of the average life expectancy of people living with HIV (PLWH), as well as the emergence of comorbidities and non-AIDS related cancer. Hepatocellular carcinoma (HCC) is the most common primary liver malignancy. Current evidence suggests that HCC is an important cause of morbidity and mortality in HIV infected patients. In fact, HCC prevalence rate is indeed higher with respect to the general population average. In this paper, we review the diagnostic and therapeutic management of Hepatitis C-related hepatocellular carcinoma in HCV-HIV co-infected patients. Several therapeutic options are available depending on several factors as HCC stage, liver functions, comorbidities and they have been divided into three groups: potentially curative, proven effective but not curative, and unproven or ineffective therapy. In HIV-infected patients, surgical options are preferred compared to non-surgical therapies. Further studies, especially multicenter ones, are needed in order to define the most appropriate, evidence-based therapeutic approach to PLWH suffering from HCC. It also appears necessary to develop appropriate care guidelines for PLWH.

Kaposi's sarcoma in HIV-infected patients in the era of new antiretrovirals.

Kaposi's Sarcoma (KS) is a multicentric angioproliferative cancer of endothelial cells (ECs) caused by Human Herpesvirus 8 (HHV8) characterized by clinical heterogeneity depending on the host immune conditions. Despite its incidence has dramatically decreased in developed countries after the introduction of Highly Active Antiretroviral Therapy (HAART), KS remains the most frequent tumor in HIV-infected patients worldwide. Clinical presentation varies from an indolent slowly progressive behavior, generally limited to the skin, to an aggressive and rapidly progressing disease. In more than 50% of cases, the skin lesions are often associated with a more or less important visceral involvement, particularly to the oral cavity and the gastrointestinal tract that are involved in 35% and 40% of cases respectively. A large number of treatments can be used both as local and as systemic therapy. Particularly, HAART represents the first treatment in patients with moderate lesions limited to skin, and it can be sufficient to reduce significantly the size of lesions and, often, the complete disappear in 35% of cases after 3-9 months of treatment. In case of a rapidly progressive disease with extensive cutaneous and/or visceral involvement systemic drugs are used such as the liposomal anthracyclines pegylated liposomal doxorubicin (PLD) and daunorubicin citrate liposome (DNX), the combined treatment adriamycin-bleomycin-vincristine (ABV) and bleomycin-vincristine (BV), Paclitaxel and Interferon-alfa. In patients with limited skin localization, the local treatment can play an important role. Local medical therapy is based on the use of alitretinoin, antineoplastic drugs vincristine, vinblastine and bleomycin and Sodium Tetradecyl Sulfate (STS). In addition to medical therapy, physical treatment, such as cryotherapy and radiotherapy, are also commonly used.

Unscheduled cyclin B expression and p34 cdc2 activation in T lymphocytes from HIV-infected patients.

OBJECTIVE: To study the role of cell cycle regulation during HIV infection by investigating in vivo and in vitro cyclin B and p34 cdc kinase expression. METHODS: Cyclin B expression was analysed by Western blot in CD4 and CD8 cells from 25 HIV-infected patients and 24 uninfected individuals. In eight patients, a sequential analysis was performed after initiation of antiretroviral therapy (ART), and correlations with CD4 cell count and HIV viremia were studied. Sequential changes in cyclin B expression and p34 cdc kinase expression and activity were also studied in lymphocytes activated in vitro with phytohaemagglutinin (PHA). RESULTS: Lymphocytes from untreated HIV-infected patients demonstrate persistent in vivo overexpression of cyclin B in both CD4 and CD8 cell subpopulations. When cells are stimulated to proliferate in vitro, biochemical events that characterize the entrance into the cell cycle [ornithine decarboxylase (ODC) activity, interleukin 2 production, interleukin 2 alpha-chain receptor (IL-2R, CD25) expression, total protein synthesis, total DNA synthesis] show similar timing and sequence in lymphocytes from HIV-infected and uninfected individuals. However, in peripheral blood lymphocytes (PBL) from HIV-infected patients, cyclin B and p34 cdc kinase show premature expression during the cell cycle. Both in vivo cyclin B overexpression and in vitro unscheduled cyclin B expression were almost completely reversed 2-4 weeks after initiation of effective ART. CONCLUSION: Increased and unscheduled expression of cyclin B and p34 cdc kinase is consistently observed in CD4 and CD8 cells from HIV-infected patients, both in vivo and after in vitro mitogenic stimulation. These alterations correlate with the level of viremia and may provide a link between the perturbation of lymphocyte proliferative homeostasis and the exaggerated propensity towards apoptosis.

Effect of beta-endorphin on cell growth and cell death in human peripheral blood lymphocytes.

Beta-endorphin (beta-end) was investigated for its ability to influence sequential metabolic events that accompany the movements of T-lymphocytes into the cell cycle. When cultured lymphocytes are exposed to this endogenous opioid peptide an increase in polyamine transport across cell membrane is observed. This membrane modification is an early cell cycle event, whose enhancement leads to the intracellular polyamine accumulation. It is shown that beta-end is able to enhance spermidine transport and that the exposition of cells to this peptide is perceived as an apoptotic signal. The possible relationship between induction of apoptotic death and enhancement of polyamine uptake is discussed.

Virulence factors in Vibrios and Aeromonads isolated from seafood.

Thirty-one isolates from seafood, identified as Aeromonas hydrophila (7), Aeromonas caviae (11), Vibrio parahaemolyticus (3), Vibrio fluvialis (5), Vibrio alginolytictus (3), Vibrio metschnikovii (1) and Vibrio damsela (1), were tested for possible virulence factors including extracellular hydrolytic enzymes, haemolysins, cytotoxins (VERO and HEp-2 cells) and adherence ability (HEp-2 cells). All the A. hydrophila strains were beta-haemolytic and produced cytotoxins as well as one strain of V. fluvialis. A. hydrophila and A. caviae strains, frequently adhesive, showed both aggregative and diffusive patterns, while five Vibrio strains only (three V. fluvialis, one V. parahaemolyticus and one V. alginolyticus) were adhesive with an aggregative pattern.

Evaluation of antiherpesvirus-1 and genotoxic activities of Helichrysum italicum extract.

The antiherpes virus-1 and genotoxic activities of diethyl ether extract from flowering tops of Helichrysum italicum (Compositae) were investigated. The extract showed significant antiviral activity at concentrations ranging from 400 to 100 microg/ml. This activity was not due to cytotoxic effect of the extract since Vero cells exhibited altered morphology or growth characteristics indicative of cytotoxic effects at higher concentration (800 microg/ml). Moreover H. italicum extract showed no DNA-damaging activity at concentrations up to 2000 microg/disk.

[Chlamydia pneumoniae and Helicobacter pylori infections in acute myocardial infarction]. / Infezione da Chlamydia pneumoniae e da Helicobacter pylori nell'infarto miocardico acuto.

BACKGROUND: Increasing evidence suggests an acute or chronic linkage between infection and acute coronary syndromes. The aim of this study was to assess the frequency of Chlamydia pneumoniae (CP) and Helicobacter pylori (HP) antibodies in patients with angiographically defined acute myocardial infarction and in population controls. Case patients and controls were drawn from the same geographic area (city of Messina and its province). METHODS: Blood samples were collected in 206 incident cases of acute myocardial infarction presenting to the Coronary Care Unit (196 men, 10 women, mean age 58+/-7 years) in the period from March 1997 to June 1999. Case patients were selected if they were non-smokers, non-diabetic and if they had no history of hypertension. The control group consisted of 142 healthy subjects, without a known history of smoking, diabetes, and hypertension. Controls were matched to acute myocardial infarction patients for age, sex and socio-economic status. Commercial ELISA assay was used to measure IgG antibody to HP (positive titer > 8 IU/ml) and indirect immunofluorescence method was used to assess IgG antibody anti-CP (IgG titer > 1:64 was considered a marker of chronic infection). RESULTS: No significant difference was observed in the frequency of HP antibodies in acute myocardial infarction patients and in the control group (43.3 vs 41.5%, p = NS, odds ratio-OR 1, 95% confidence interval-CI 0.7-1.6). On the contrary, CP titers were increased in 83% of acute myocardial infarction patients, and in 57% of control subjects (p < 0.001, OR 3.6, 95% CI 2.2-5.7). In acute myocardial infarction patients seropositivity for CP was associated with increased basal fibrinogen levels (539 vs 445 mg/dl). No correlation was found between seropositivity to CP and C-reactive protein, and with total or fractionated cholesterol and triglyceride concentrations. CONCLUSIONS: The present data indicate that, in our sample, acute myocardial infarction was associated with an increased frequency of CP seropositivity. The presence of CP antibodies was not associated with elevated levels of C-reactive protein. Our data support the need for controlled studies to investigate the role of these infective agents as a trigger of acute coronary syndromes.

Effect of growth conditions on extracellular products (ECPs) of Aeromonas hydrophila.

Owing to the significant role in gastrointestinal illness of A. hydrophila, frequently detected in various raw and ready-to eat foods, its pathogenetic mechanisms are particularly studied. In this paper we report the results obtained studying in vitro the effect of O2 tension and inoculum age on the extra cellular products (ECPs) of seven strains food-borne isolated and cultured at 37 degrees. The considered factors influenced markedly bacterial growth as well as ECPs production and the more notable differences were detected among 15 hours old strains let grown slowly shaking (15SH), that showed the highest bacterial yield, and 24 h old strains cultured statically (24ST), whose haemolysin and cytotoxin production was favoured. Wilcoxon test shows as, in these latter conditions, the strains needed short time to adapt the haemolysin and cytotoxin production. The oxygen tension reduction, extending the replication time, induces the bacterial metabolism toward secondary products, as verified by Spearman test applied to ECPs indexes. The increased production per cell of virulence-associated factors could be responsible of gastrointestinal disorders caused by food-borne A. hydrophila strains, even without a massive gut colonization, especially when immunocompromised individuals ingest contaminated foods.