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Yanet Valdez
Researcher at Cayetano Heredia University
Publications - 5
Citations - 452
Yanet Valdez is an academic researcher from Cayetano Heredia University. The author has contributed to research in topics: Helicobacter pylori & Agar. The author has an hindex of 5, co-authored 5 publications receiving 443 citations. Previous affiliations of Yanet Valdez include Washington University in St. Louis.
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Journal ArticleDOI
Differences in Genotypes of Helicobacter pylori from Different Human Populations
Dangeruta Kersulyte,Asish K. Mukhopadhyay,Billie Velapatiño,Billie Velapatiño,WanWen Su,Zhi-jun Pan,C.M. Garcia,Virginia Hernandez,Yanet Valdez,Yanet Valdez,Rajesh S. Mistry,Robert H. Gilman,Yuan Yuan,Yuan Yuan,Hua Gao,Hua Gao,Teresa Alarcón,Manuel López-Brea,G. Balakrish Nair,Abhijit Chowdhury,Simanti Datta,Mutsunori Shirai,Teruko Nakazawa,Reidwaan Ally,Isidore Segal,Benjamin C.Y. Wong,Shiu Kum Lam,Farzad O. Olfat,Farzad O. Olfat,Thomas Borén,Lars Engstrand,Olga Torres,Roberto Schneider,Julian Thomas,Steven J. Czinn,Douglas E. Berg +35 more
TL;DR: Sequences in the cagA gene and in vacAm1 type alleles of the vacuolating cytotoxin gene (vacA) of strains from native Peruvians were also more like those from Spaniards than those from Asians, leading us to suggest that H. pylori infection might have become widespread in people quite recently in human evolution.
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Rapid Recurrence of Helicobacter pylori Infection in Peruvian Patients after Successful Eradication
Alberto Ramírez-Ramos,Robert H. Gilman,Raul Leon-Barua,Sixto Recavarren-Arce,Jose Watanabe,Guillermo Salazar,William Checkley,Jeff McDonald,Yanet Valdez,Luis Cordero,Juan Carrazco +10 more
TL;DR: Rapid recurrence of H. pylori infection after successful eradication suggests that measures other than antimicrobial therapy are needed to fight H.pylori in developing countries.
Journal ArticleDOI
Metronidazole and clarithromycin resistance in Helicobacter pylori determined by measuring MICs of antimicrobial agents in color indicator egg yolk agar in a miniwell format. The Gastrointestinal Physiology Working Group of Universidad Peruana Cayetano Heredia and the Johns Hopkins University.
A Vasquez,Yanet Valdez,Robert H. Gilman,J J McDonald,T U Westblom,D Berg,Holger Mayta,V Gutierrez +7 more
TL;DR: The miniwell plate with TEY agar allows easy H. pylori colony identification, requires about one-third less of the costly medium necessary for petri dish assaying, conserves space, and yields MICs equivalent to those with agar dilution in petri dishes.
Journal ArticleDOI
Helicobacter pylori Populations in Peruvian Patients
Douglas E. Berg,Robert H. Gilman,Janaki Lelwala-Guruge,Kalpana Srivastava,Yanet Valdez,Jose Watanabe,Juan Miyagi,Natalia S. Akopyants,Alberto Ramírez-Ramos,Tacano H. Yoshiwara,Sixto Recavarren,Raul Leon-Barua +11 more
TL;DR: It is proposed that the homogeneity in RAPD fingerprints for strains isolated from most persons reflects selection for particular H. pylori genotypes during chronic infection in individual hosts and the human diversity in traits that are important to this pathogen.
Journal ArticleDOI
Antimicrobial susceptibility of Helicobacter pylori determined by the E test using tetrazolium egg yolk agar.
Yanet Valdez,Billie Velapatiño,Robert H. Gilman,Robert H. Gilman,Vilma Gutierrez,Carlos León +5 more
TL;DR: The characteristic E test inhibition ellipse was clearer on TEY agar than on standard blood agar and gave results comparable to those of the agar dilution test.