Primary resistance to clarithromycin, metronidazole and amoxicillin of Helicobacter pylori isolated from Tunisian patients with peptic ulcers and gastritis: a prospective multicentre study

<p>Abstract</p> <p>Background</p> <p>The frequency of primary resistance to antibiotics in H. pylori isolates is increasing worldwide. In Tunisia, there are limited data regarding the pattern of H. pylori antibiotic primary resistance.</p> <p>Aim</p> <p>To evaluate the primary resistance of H. pylori to clarithromycin, metronidazole and amoxicillin and to detect the mutations involved in clarithromycin resistance.</p> <p>Materials and methods</p> <p>273 strains isolated from adults and children were enrolled. The primary resistance to clarithromycin, metronidazole and amoxicillin was evaluated by means of E-test minimal inhibitory concentration (MIC). The real-time PCR using Scorpion primers was performed in all cases to assess clarithromycin primary resistance and point mutations involved.</p> <p>Results</p> <p>No resistance to amoxicillin was detected. For adults, resistance to clarithromycin and metronidazole was found respectively in 14.6% and 56.8%, and respectively in 18.8% and 25% in children. Overall, the rates of global primary resistance to clarithromycin and metronidazole in Tunisia were respectively determined in 15.4% and 51.3%.</p> <p>By the use of Scorpion PCR, the A2143G was the most frequent point mutation observed (88.1%), followed by the A2142G (11.9%); the A2142C was not found and 18 of 42 patients (42.8%) were infected by both the resistant and the susceptible genotype.</p> <p>The association of clarithromycin resistance with gender was not statistically significant, but metronidazole resistant strains were isolated more frequently in females (67.8%) than in males (32.2%) and the difference was significant. As for gastroduodenal diseases, the difference between strains isolated from patients with peptic ulceration and those with non peptic ulceration was not statistically significant. When about the distribution of resistant strains to clarithromycin and metronidazole between the three Tunisian cities (Tunis, Menzel Bourguiba and Mahdia), the difference was not statistically significant.</p> <p>Conclusion</p> <p>Local data regarding the primary resistance of H. pylori to clarithromycin, metronidazole and amoxicillin and the main genetic mutation involved in clarithromycin resistance in vivo (A2143G) are necessary to prove a clear need for a periodic evaluation of antibiotic consumption and new therapeutic strategies in Tunisia in order to avoid the emergence of resistant strains.</p

Health and Environmental Impact of Hospital Wastes: Systematic Review

Introduction: Healthcare activities are generally associated with the production of healthcare waste, a large part of which is assimilated to household waste (packaging, kitchen waste, green waste, etc.) and another category of waste which may have a risk to health and the environment given its nature and typology. This category of waste at risk includes waste at risk of infection such as stinging, sharp waste (needles, blade, scalpel, etc.), and waste at chemical risk. Poor management of hospital waste is a problem in most countries and especially in developing countries. We aimed to determine the health and environmental impacts of the poor management of healthcare waste. Methods: We carried out a systematic review of the French and English literature on the scientific research sites Medline/PubMed and Embase. This research was carried out over 3 months (April–June 2020). The search strategy was used by combining keywords and Boolean operators: Health, Health impact assessment, Hospitals, Medical waste, Waste disposal facilities, Environment, Environment/Epidemiology, Hospital waste, impact, workplace, Environment hazards, Healthcare works, Waste management. Results: It has been clear that the current management of healthcare waste is not capable of adequately preserving human health and environmental contamination from infection. The surveys analyzed showed that if incineration is properly treated, it would be an appropriate treatment method to deal with healthcare waste. However, exposure to pollutants produced by the incineration is still a public health problem. If incineration is seen as a practical solution for dealing with healthcare waste, low-temperature incinerators should be banned and replaced by modern incinerators equipped with air pollution control units. These problems are typical for any developing country which does not have the means to purchase incinerators which are more protective for the environment and equipped with the latest technologies. Conclusions: Thus, autoclaving and microwaves are considered better alternatives for treating healthcare waste. However, these methods are generally not adequate for the disposal of pathological, radioactive, laboratory, and chemotherapy wastes. Therefore, the specific management of healthcare waste is a major concern due to the potentially high risks for human health and the environment

Prevalence of hepatitis C virus (HCV) variants resistant to NS5A inhibitors in naïve patients infected with HCV genotype 1 in Tunisia

International audienceBackground: Hepatitis C virus (HCV) non-structural protein 5A (NS5A) inhibitors have been recently developed to inhibit NS5A activities and have been approved for the treatment of HCV infection. However the drawback of these direct acting antivirals (DAAs) is the emergence of resistance mutations. The prevalence of such mutations conferring resistance to HCV-NS5A inhibitors before treatment has not been investigated so far in the Tunisian population. The aim of this study was to detect HCV variants resistant to HCV-NS5A inhibitors in hepatitis C patients infected with HCV genotype 1 before any treatment with NS5A inhibitors. Methods: Amplification and direct sequencing of the HCV NS5A region was carried out on 112 samples from 149 untreated patients. Results: In genotype 1a strains, amino acid substitutions conferring resistance to NS5A inhibitors (M28V) were detected in 1/7 (14.2 %) HCV NS5A sequences analyzed. In genotype 1b, resistance mutations in the NS5A region (R30Q; L31M; P58S and Y93H) were observed in 17/105 (16.2 %) HCV NS5A sequences analyzed. R30Q and Y93H (n = 6; 5.7 %) predominated over P58S (n = 4; 3.8 %) and L31M (n = 3; 2.8 %). Conclusions: Mutations conferring resistance to HCV NS5A inhibitors are frequent in treatment-naive Tunisian patients infected with HCV genotype 1b. Their influence in the context of DAA therapies has not been fully investigated and should be taken into consideration

Phylogenetic Analysis and Epidemic History of Hepatitis C Virus Genotype 2 in Tunisia, North Africa.

HCV genotype 2 (HCV-2) has a worldwide distribution with prevalence rates that vary from country to country. High genetic diversity and long-term endemicity were suggested in West African countries. A global dispersal of HCV-2 would have occurred during the 20th century, especially in European countries. In Tunisia, genotype 2 was the second prevalent genotype after genotype 1 and most isolates belong to subtypes 2c and 2k. In this study, phylogenetic analyses based on the NS5B genomic sequences of 113 Tunisian HCV isolates from subtypes 2c and 2k were carried out. A Bayesian coalescent-based framework was used to estimate the origin and the spread of these subtypes circulating in Tunisia. Phylogenetic analyses of HCV-2c sequences suggest the absence of country-specific or time-specific variants. In contrast, the phylogenetic grouping of HCV-2k sequences shows the existence of two major genetic clusters that may represent two distinct circulating variants. Coalescent analysis indicated a most recent common ancestor (tMRCA) of Tunisian HCV-2c around 1886 (1869-1902) before the introduction of HCV-2k in 1901 (1867-1931). Our findings suggest that the introduction of HCV-2c in Tunisia is possibly a result of population movements between Tunisia and European population following the French colonization

Molecular epidemiology of hepatitis B and Delta virus strains that spread in the Mediterranean North East Coast of Tunisia

International audienceBackground: Tunisia is classified as an area of middle endemic for hepatitis B virus (HBV) infection, however little is known about hepatitis Delta virus (HDV) infection. Objectives: This study aimed to address the prevalence of HDV infection, to identify possible risks factors, and to analyze the genetic diversity of HDV strains that are spreading in Tunisia. Study design: A retrospective large-scale study including 1615 HBsAg positive patients, native of the North East coast of Tunisia, recruited from Gastroenterology departments, was conducted. Demographic, epidemiological, ethnical, clinical and biological data were recorded. HBV and HDV serological analyses and DNA and RNA viral load quantification were performed. Genotyping of HBV and HDV strains was performed using nucleotide sequencing followed by phylogenetic analyses. Results: The study population included 819(50.7%) men and 796(49.3%) women; aged 12-90 years (mean age 41 + 13 years). A very low prevalence of HDV infection, 2% was observed. No risk factor, except a history of hospitalization for surgery was found. All HDV strains belonged to genotype 1, with a wide distribution within the HDV-1 group. They all share the African amino acid marker, a serine at position 202 of the large Delta protein. HBV genotypes were distributed as follows: HBV/D1 (56.8%), HBV/D7 (40.9%), and HBV/A2 (2.3%). Conclusion: Tunisia is a low endemic region for HDV infection, due to an efficient policy of HBV infection control. HDV-1 is the sole genotype found, with a high diversity within this group. Further studies are ongoing in order to better characterize and manage the HBV/HDV-infected patients according to the genetic variability of the viral strains. (C) 2015 Elsevier B.V. All rights reserved

Bayesian Skyline Plots for Demographic Reconstruction using NS5B sequences.

<p>A) subtype 2c, B) subtype 2k; X-axis: Date in Years; Y-axis: Estimated effective number of infections; Bold Line: Mean Effective Number of viral population. Upper and lower Lines: Upper and Lower HPD95% (High Population Density) of Effective Number of viral population.</p

_tMRCA estimations using the NS5B region for the HCV- 2c and HCV-2k in Tunisia.

<p>_tMRCA estimations using the NS5B region for the HCV- 2c and HCV-2k in Tunisia.</p