Browsing Faculté de médecine vétérinaire – Travaux et publications by Author "Letellier, Ann"
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Characterisation of InlA truncation in Listeria monocytogenes isolates from farm animals and human cases in the province of Quebec
Fravalo, Philippe; Tamazight, Cherifi; Neira Feliciano, Kersti Dina; Letellier, Ann; Fairbrother, Julie-Hélène; Bekal, Sadjia (2017-06)The introduction of Listeria monocytogenes into the food production chain is a concern, with numerous grouped cases of listeriosis associated with milk-derived or pork-derived products have been documented. Management of this zoonotic pathogen considers ... -
Chicken Caecal Microbiome Modifications Induced by Campylobacter jejuni Colonization and by a Non-Antibiotic Feed Additive
Thibodeau, Alexandre; Fravalo, Philippe; Yergeau, Étienne; Arsenault, Julie; Lahaye, Ludovic; Letellier, Ann (2015-07)Campylobacter jejuni is an important zoonotic foodborne pathogen causing acute gastroenteritis in humans. Chickens are often colonized at very high numbers by C. jejuni, up to 109 CFU per gram of caecal content, with no detrimental effects on their ... -
Dynamics of viral distribution in a defined swine production network using enteric viruses as molecular markers
Lachapelle, Virginie; Letellier, Ann; Fravalo, Philippe; Brassard, Julie; L’Homme, Yvan (2017-02)Modern swine production systems represent complex and dynamic networks involving numerous stakeholders. For instance, livestock transporters carry live animals between fattening sites, abattoirs, and other premises on a daily basis. This interconnected ... -
Extended-spectrum β-lactamase, carbapenemase, and the mcr-1 gene: Is there a historical link?
Rhouma, Mohamed; Letellier, Ann (2017-03-30)The plasmid mediated mcr-1 gene encoding for Enterobacteriaceae colistin resistance has been recently identified across five continents. The objective of the present study was to trace historical events concerning the discovery and emergence of the ... -
Extensive characterization of Campylobacter jejuni chicken isolates to uncover genes involved in the ability to compete for gut colonization
Thibodeau, Alexandre; Fravalo, Philippe; Taboada, Eduardo N.; Laurent-Lewandowski, Sylvette; Guévremont, Èvelyne; Quessy, Sylvain; Letellier, Ann (2015-05)Background: Campylobacter jejuni is responsible for human foodborne enteritis. This bacterium is a remarkable colonizer of the chicken gut, with some strains outcompeting others for colonization. To better understand this phenomenon, the objective ... -
The fecal presence of enterotoxin and F4 genes as an indicator of efficacy of treatment with colistin sulfate in pigs
Rhouma, Mohamed; Fairbrother, John Morris; Thériault, William; Beaudry, Francis; Bergeron, Nadia; Laurent-Lewandowski, Sylvette; Letellier, Ann (2017)Background : Enterotoxigenic Escherichia coli (ETEC) strains producing multiple enterotoxins are important causes of post-weaning diarrhea (PWD) in pigs. The aim of the present study was to investigate the fecal presence of ETEC enterotoxin as well ... -
Gastric stability and oral bioavailability of colistin sulfate in pigs challenged or not with Escherichia coli O149: F4 (K88)
Rhouma, Mohamed; Beaudry, Francis; Thériault, William; Bergeron, Nadia; Laurent-Lewandowski, Sylvette; Fairbrother, John Morris; Letellier, Ann (2015-10)The aim of the present study was to investigate the in vitro gastric stability of colistin sulfate (CS) and its antimicrobial activity against Escherichia coli and to study the impact of ETEC O149: F4 (K88) infection in pigs on CS intestinal absorption. ... -
Genetic diversity of group A rotavirus in swine in Canada
Lachapelle, Virginie; Sohal, Jagdip Singh; Lambert, Marie-Christine; Brassard, Julie; Fravalo, Philippe; Letellier, Ann; L'Homme, Yvan (2014-01-09)Group A rotaviruses (RVA) in pigs have been poorly investigated in Canada. In a continued effort to fill this gap, ten finisher swine farms in Quebec, Canada, were sampled over a nine-month period. The presence of RVA was detected in healthy pigs on ... -
Impact of mash feeding versus pellets on propionic/butyric acid levels and on total Escherichia coli load in the gastrointestinal tract of growing pigs
Longpré, Jessie; Fairbrother, J.M.; Fravalo, Philippe; Arsenault, Julie; LeBel, P.; Laplante, B.; Surprenant, C.; Massé, D.; Letellier, Ann (2016-03)Feed characteristics may influence the bacterial community composition and metabolic activities in the pig gastrointestinal tract, known to be associated with positive effects on the gut. Use of mash feed is associated with reduced Salmonella ... -
Post weaning diarrhea in pigs: risk factors and non‑colistin‑based control strategies
Rhouma, Mohamed; Fairbrother, John Morris; Beaudry, Francis; Letellier, Ann (2017)Post-weaning diarrhea (PWD) is one of the most serious threats for the swine industry worldwide. It is commonly associated with the proliferation of enterotoxigenic Escherichia coli in the pig intestine. Colistin, a cationic antibiotic, is widely used ... -
Resistance to colistin : what is the fate for this antibiotic in pig production?
Rhouma, Mohamed; Beaudry, Francis; Letellier, Ann (2016-08)Colistin, a cationic polypeptide antibiotic, has reappeared in human medicine as a last-line treatment option for multidrug-resistant Gram-negative bacteria (MDR-GNB). Colistin is widely used in veterinary medicine for the treatment of gastrointestinal ... -
Survival in water of Campylobacter jejuni strains isolated from the slaughterhouse
Trigui, Hana; Thibodeau, Alexandre; Fravalo, Philippe; Letellier, Ann; Faucher, Sebastien P. (2015-01)Campylobacter jejuni cause gastroenteritis in humans. The main transmission vector is the consumption or handling of contaminated chicken meat, since chicken can be colonized asymptomatically by C. jejuni. However, water has been implicated as the ...