Dengue Virus Circulation and Evolution in Mexico: A Phylogenetic Perspective

Díaz, Francisco J.; Black, William C.; Farfán-Ale, José A.; Loroño-Pino, María A.; Olson, Kenneth E.; Beaty, Barry J.

doi:10.1016/j.arcmed.2006.02.004

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Volume 37, Issue 6 , Pages 760-773, August 2006

Dengue Virus Circulation and Evolution in Mexico: A Phylogenetic Perspective

Francisco J. Díaz
- Arthropod-Borne and Infectious Disease Laboratory, Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, Colorado
- Grupo de Inmunovirología, Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia
William C. Black IV
- Arthropod-Borne and Infectious Disease Laboratory, Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, Colorado
José A. Farfán-Ale
- Laboratorio de Arbovirología, Centro de Investigaciones Regionales Dr. Hideyo Noguchi, Universidad Autónoma de Yucatán, Mérida, Yucatán, México
María A. Loroño-Pino
- Arthropod-Borne and Infectious Disease Laboratory, Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, Colorado
- Laboratorio de Arbovirología, Centro de Investigaciones Regionales Dr. Hideyo Noguchi, Universidad Autónoma de Yucatán, Mérida, Yucatán, México
Kenneth E. Olson
- Arthropod-Borne and Infectious Disease Laboratory, Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, Colorado
Barry J. Beaty
- Arthropod-Borne and Infectious Disease Laboratory, Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, Colorado
- Address reprint requests to: Barry J. Beaty, Arthropod-Borne and Infectious Diseases Laboratory, Colorado State University, 1692 Campus Delivery, Fort Collins, CO 80523-1692

Received 1 December 2005; accepted 10 February 2006.

(ARCMED-D-05-00494)

Background

Dengue is the most important arthropod-borne viral infection in the Americas. In the last decades a progressive increment in dengue severity has been observed in Mexico and other countries of the region.

Methods

Molecular epidemiological studies were conducted to investigate the viral determinants of the emergence of epidemic dengue, dengue hemorrhagic fever and dengue shock syndrome as major public health problems in Mexico. Bayesian phylogenetic analyses were conducted to determine the origin, persistence and geographical dispersion of the four serotypes of dengue virus (DENV) isolated in Mexico between 1980 and 2002. Tests for natural selection were also conducted.

Results

The origin of some, but not all, strains circulating in Mexico could be inferred. Frequent lineage replacements were observed and were likely due to stochastic events. In situ evolution was detected but not associated with natural selection. Recent changes in the incidence and severity of dengue were temporally associated with the introduction and circulation of different serotypes and genotypes of DENV.

Conclusions

Introduction of new DENV genotypes and serotypes is a major risk factor for epidemic dengue and severe disease. Increased surveillance for such introductions is critical to allow public health authorities to intervene in impending epidemics.

Key Words: Dengue, Evolution, Phylogenetic analysis, Mexico