Shahram Nazarian

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BACKGROUND Enterotoxigenic Escherichia coli (ETEC) strains are the major causes of diarrheal disease in humans and animals. Colonization factors and enterotoxins are the major virulence factors in ETEC pathogenesis. For the broad-spectrum protection against ETEC, one could focus on colonization factors and non-toxic heat labile as a vaccine candidate. (More)
Enterohemorrhagic Escherichia coli (EHEC) serotype O157:H7 is a food-borne pathogen that younger children are most prone to this microorganism. Hemolytic Uremic Syndrome (HUS) caused by EHEC, leads to the destruction of red blood cells and kidney failure. The virulence of E.coli O157:H7 is attributed to fimbriae, that facilitate colonization of bacteria(More)
Enteric infections resulting in diarrheal diseases remain as major global health problems. Among bacteria, enterotoxigenic Escherichia coli (ETEC) causes the largest number of diarrheal cases. There is a great interest in developing an effective ETEC vaccine. An ETEC vaccine could focus on virulence factors present in ETEC pathogens and nontoxic Heat-labile(More)
BACKGROUND/AIM The uptake of the ferric-acinetobactin complex into the periplasmic space relies on the baumannii acinetobactin utilization (BauA) protein. BauA is composed of cork and the β-barrel domains. We constructed a recombinant protein from conserved antigenic domains of cork and the β-barrel of BauA to evaluate their immunogenic role in an animal(More)
Enterotoxigenic Escherichia coli (ETEC) are the most common cause of diarrhea among children. Colonization factors and enterotoxins are the major ETEC candidate vaccines. Since protection against ETEC mostly occurs by induction of IgA antibodies, much effort is focused on the development of oral vaccines. In this study oral immunogenicity of a(More)
Enterotoxigenic Escherichia coli (ETEC) is the most common cause of diarrhea among children. ETEC strains express colonization factors (CFs), which mediate adherence to the small intestinal epithelium and produce entrotoxins that induce diarrhea. Here, we characterized the phenotypes and genotypes of ETEC strains from 261 diarrheal stool samples from(More)
BACKGROUND Recombinant vaccine technology is one of the most developed means in controlling infectious diseases. However, an effective vaccine against Shigella is still missing. OBJECTIVE To evaluate recombinant IpaC protein of Shigella as a vaccine candidate. METHODS In this study we cloned IpaC gene into an expression vector in prokaryotic system. The(More)
Shiga toxin producing bacteria are potential causes of serious human disease such as hemorrhagic colitis, severe inflammations of ileocolonic regions of gastrointestinal tract, thrombocytopenia, septicemia, malignant disorders in urinary ducts, hemolytic uremic syndrome (HUS). Shiga toxin 1 (stx1), shiga toxin 2 (stx2), or a combination of both are(More)
BACKGROUND The ability to sensitively detect Vibrio cholera with PCR-ELISA method represents a considerable advancement over alternative more time-consuming methods for detection of this pathogen. The aim of this research is to evaluate the suitability of a PCR-enzyme-linked immunosorbent assay for sensitive and rapid detection of V. cholera O1. METHODS(More)
BACKGROUND AND OBJECTIVES Enterohemorrhagic Escherichia coli (EHEC) O157:H7 has been recognized as a major food borne pathogen responsible for frequent hemorrhagic colitis and hemolytic uremic syndrome in humans. Cattle are important reservoirs of E. coli O157:H7, in which the organism colonizes the intestinal tract and is shed in the feces. OBJECTIVE(More)