Such sensitization has been observed in the course of sequential dengue epidemics by different virus strains in Cuba.
在古巴，不同病毒株引起的一系列登革热流行过程中已经观察到这种致敏作用。
By infecting the mice with strains of the dengue virus, investigators can study how the disease takes hold and what factors might cause the more serious and often deadly dengue hemorrhagic fever.
使老鼠感染登革热，通过这一过程，科研人员就可以研究登革热的传播特点，并探究究竟是哪些因素导致了较为严重，通常会致人死命的出血性登革热。
By infecting the mice with strains of the dengue virus, investigators can study how the disease takes hold and what factors might cause the more serious and often deadly dengue hemorrhagic fever.
使老鼠感染登革热，通过这一过程，科研人员就可以研究登革热的传播特点，并探究究竟是哪些因素导致了较为严重，通常会致人死命的出血性登革热。
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