Novel Extended-spectrum β-Lactamase in Shigella sonnei

Acknowledgments We dedicate this work to the late Andrew Spielman, our coauthor and beloved mentor. We thank J. Rivero, I. Pérez, M. Méndez, I. Matheus, M. Aguiar de Bracho, I. Carreño, J.M. Hernández, A. Nagy, A. Suarez, N. Moncada, M. Kilpatrick, E. Rodriguez, E. Marquez, E. Marian, B. Hernández; C. Rivero-Blanco, M. Azar, J. Rodriguez, H. Montañez, F. Alfonzo, and G. Rangel for their contributions to this study; and the Centro de Investigaciones Biomédicas, Universidad de Carabobo and the Cell Culture Core of Wadsworth Center, New York State Health Department, for their support. We also thank ProFauna and the National Institute of Parks in Venezuela for permission to obtain mosquito and bird samples.