This is supported by a previous work that suggests that density of geographical and temporal sampling Selleckchem SBI-0206965 increases the probability for identifying recombinant sequences [25]. Phylogenetic studies have shown the circulation of the American [43], American/Asian [23], and Cosmopolitan [44] genotypes in Mexico, which makes feasible their recombination and explains the fact of the Cosmopolitan and American genotypes to recombine with the Asian/American

genotype spread more broadly. Our results in combination with previous reports [26] on DENV-2 recombination suggest that the different genotypes of DENV-2 are circulating in the virus pool infecting the mosquitoes or the human cells around the world. Until now, it remains unclear whether the frequency of recombination seen in this and previous studies Selleck Ferrostatin-1 is driving an increasing virulence of DENV strains. However, the

recombinant strains of this study were obtained from the outbreak 2005-2006 where the frequency of DHF cases was higher than the DF cases in comparing to previous epidemics [45]. To elucidate the role of recombination in DENV virulence will be necessary to follow the generation of recombinants in outbreaks from other Mexican states. Conclusions It is unclear whether the recombination events took place in a human host or a mosquito vector co-infected by multiple DENV genotypes. In this study, we detected two recombinant isolates of DENV-2 from human hosts namely MEX_OAX_1038_05 and MEX_OAX_1656_05, which identify 3 breakpoints within the prM-E-NS1 genome.

Particularly the recombination appeared to have involved two genotypes of DENV-2, the Asian/American clone (MEX_OAX_1656_05_C241) from the same strain and the Cosmopolitan strain (INDI_GWI_102_01). It is remarkable that parental and recombinant viral sequences of protein E were observed in an isolate from a single patient, particularly when the recombination appeared to have involved two genotypes of DENV-2 (Asian/American and the American) from the same geographic area (Oaxaca, Mexico). This is only the second observation Rucaparib of one parental and recombinant of DENV-2 in a population within a single host [26]. There are two more studies where both parental and recombinant viral genomes were observed in a DENV-1 isolate from a single patient. DENV recombination mechanism will be clarified by undertaking more studies of clonal diversity in both human and mosquito vector in Mexico. Methods DENV infected cells and virus isolation Aedes albopictus clone C6/36 cells were grown at 28°C. After 18 h of culture, cells (2 × 106/100 mm plate) were infected with 0.2 ml DEN-2 inoculums with an input MOI of 600 PFU/cell and were incubated at 28°C for 10 days. Viruses were isolated as previously described [46] with a few modifications.