HIV-1 Epidemic in the Caribbean Is Dominated by Subtype B

The molecular epidemiology of HIV-1 in the Caribbean has been described using partial genome sequencing; subtype B is the most common subtype in multiple countries. To expand our knowledge of this, nearly full genome amplification, sequencing and analysis was conducted.Virion RNA from sera collected in Haiti, Dominican Republic, Jamaica and Trinidad and Tobago were reverse transcribed, PCR amplified, sequenced and phylogenetically analyzed. Nearly full genomes were completed for 15 strains; partial pol was done for 67 strains. All but one of the 67 strains analyzed in pol were subtype B; the exception was a unique recombinant of subtypes B and C collected in the Dominican Republic. Of the nearly full genomes of 14 strains that were subtype B in pol, all were subtype B from one end of the genome to the other and not inter-subtype recombinants. Surprisingly, the Caribbean subtype B strains clustered significantly with each other and separate from subtype B from other parts of the pandemic.The more complete analysis of HIV-1 from 4 Caribbean countries confirms previous research using partial genome analysis that the predominant subtype in circulation was subtype B. The Caribbean strains are phylogenetically distinct from other subtype B strains although the biological meaning of this finding is unclear

Molecular Epidemiology of Dengue in Jamaica Dengue Virus Genotypes in Jamaica, 2007

The genotypes of dengue viruses (DENV) isolated from patients with dengue in Jamaica during 2007 were determined using DNA sequencing and phylogenetic analysis of the C-prM gene junction. The 17 DENV analysed included strains of DENV serotypes 1 (DENV-1, n = 3), DENV-2 (n = 7) and DENV-4 (n = 7). All strains of DENV-1 were classified as genotype III, while 1 of 7 strains of DENV-2 belonged to the Asian American/Asian genotype, genotype I/ III (Jamaica genotype), 2 were genotype V, the American genotype and 4 strains clustered with reference strains belonging to genotype IV. The 6 DENV-4 strains from Jamaica and the control strain clustered together in a separate clade from Caribbean/ American reference strains, which belong to genotype II and Asian strains, classified as genotypes I and III. There has been little evolution in the DENV-1 strains circulating in Jamaica over the years and this might reduce the risk of outbreaks due to this serotype. In contrast, the high genetic diversity in strains of DENV-2 viruses in circulation, the presence of more recently introduced genotypes and a new clade of DENV-4 might contribute to the epidemic potential of these DENV serotypes. These preliminary data clearly indicate the need to maintain laboratory surveillance, and other control measures against hyperendemicity of dengue in Jamaica. Keywords: Caribbean, clade, epidemic, genotypes, phylogenetic sequencing, strain, surveillance "Epidemiología del Dengue en Jamaica Genotipos del Virus del Dengue en Jamaica, 2007" RESUMEN Los genotipos de los virus del dengue (DENV) aislados de pacientes con dengue en Jamaica durante 2007, fueron determinados usando secuenciación de ADN y análisis filogenético de la unión del gen C-prM. Los 17 DENV analizados incluyeron cepas de serotipos de DENV 1 (DENV-1, n = 3), DENV-2 (n = 7) y DENV-4 (n = 7). Todas las cepas de DENV-1 fueron clasificadas como genotipo III, mientras que 1 de 7 cepas de DENV-2 pertenecían al genotipo asiático americano/asiático, genotipo I/ III (genotipo de Jamaica), 2 fueron genotipo V, el genotipo americano y 4 cepas agrupadas con cepas de referencia pertenecientes al genotipo IV. Las 6 cepas DENV-4 de Jamaica y la cepa de control se agruparon en un clado aparte de cepas de referencia caribeña/americana, que pertenecen al genotipo II, y las cepas asiáticas, clasificadas como genotipos I y III. Ha habido poca evolución en las cepas DENV-1 que han estado circulando en Jamaica a través de todos estos años, y esto podría reducir el riesgo de brotes a causa de este serotipo. En contraste con ello, la alta diversidad genética de las cepas de los virus DENV-2 en circulación, la presencia de más genotipos introducidos recientemente, y un nuevo clado de DENV-4 podrían contribuir al potencial epidémico de estos serotipos de DENV. Estos datos preliminares indican claramente la necesidad de mantener la vigilancia de laboratorio, y otras medidas de control contra el carácter hyperendémico del dengue en Jamaica. Palabras claves: Caribeño, clado, epidémico, genotipos, secuenciación filogenética, cepa, vigilanci