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Journal of Clinical Microbiology, January 2004, p. 151-157, Vol. 42, No. 1
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.1.151-157.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Prevalence and Genetic Diversity of Human Astroviruses in Mexican Children with Symptomatic and Asymptomatic Infections

Martha Méndez-Toss,1 Dixie D. Griffin,1,{dagger} Juan Calva,2 Juan F. Contreras,3 Fernando I. Puerto,4 Felipe Mota,5 Héctor Guiscafré,6 Roberto Cedillo,6,{ddagger} Onofre Muñoz,6 Ismael Herrera,7 Susana López,1 and Carlos F. Arias1*

Instituto de Biotecnología, Universidad Nacional Autónoma de México, Cuernavaca, Morelos,1 Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán,2 Departamento de Medicina Comunitaria e Hidratación Oral, Hospital Infantil de México Federico Gómez,5 Instituto Mexicano del Seguro Social, Mexico City,6 Facultad de Ciencias Biológicas, Universidad Autónoma de Nuevo León, Monterrey, Nuevo León,3 Centro de Investigaciones Regionales "Hideyo Noguchi," Universidad Autónoma de Yucatán, Mérida, Yucatán,4 Facultad de Medicina, Universidad Autónoma de San Luis Potosí, San Luis Potosí, San Luis Potosí, Mexico7

Received 3 October 2002/ Returned for modification 12 March 2003/ Accepted 18 October 2003

The prevalence and type diversity of human astroviruses (HAstV) in children with symptomatic and asymptomatic infections were determined in five localities of Mexico. HAstV were detected in 4.6 (24 of 522) and 2.6% (11 of 428) of children with and without diarrhea, respectively. Genotyping of the detected strains showed that at least seven (types 1 to 4 and 6 to 8) of the eight known HAstV types circulated in Mexico between October 1994 and March 1995. HAstV types 1 and 3 were the most prevalent in children with diarrhea, although they were not found in all localities studied. HAstV type 8 was found in Mexico City, Monterrey, and Mérida; in the last it was as prevalent (40%) as type 1 viruses, indicating that this astrovirus type is more common than previously recognized. A correlation between the HAstV infecting type and the presence or absence of diarrheic symptoms was not observed. Enteric adenoviruses were also studied, and they were found to be present in 2.3 (12 of 522) and 1.4% (6 of 428) of symptomatic and asymptomatic children, respectively.

* Corresponding author. Mailing address: Instituto de Biotecnología/UNAM, A.P. 510-3, Colonia Miraval, Cuernavaca, Morelos 62250, México. Phone: (52-777) 311-4701. Fax: (52-777) 317-2388. E-mail: arias{at}ibt.unam.mx.

{dagger} Present address: Medical College of Georgia, Augusta, GA.

{ddagger} Present address: Instituto Mexicano del Seguro Social/Universidad Autónoma de Yucatán, Mérida, Yucatán.

Journal of Clinical Microbiology, January 2004, p. 151-157, Vol. 42, No. 1
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.1.151-157.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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