نتایج جستجو برای: mosquitos
تعداد نتایج: 554 فیلتر نتایج به سال:
The stability of the positive fixed points of a discrete-time mathematical model for populations consisting of wild and genetically altered mosquitos proposed by Jia Li [1] is considered in this paper. The model is studied for proportional and constant mating rates. Under certain conditions the model with proportional mating rate has two positive fixed points, one unstable and the other locally...
An extension of a discrete-time population dynamics model for wild and genetically altered mosquitoes that takes into account the effect of seasonal variability is presented. The seasonal variability is introduced into the model by allowing the birth and survival functions to have periodic parameters. We consider the stability of periodic solutions of the ratio dynamics and show that under some...
Initially isolated in 1947, Zika virus (ZIKV) has recently emerged as a significant public health concern. Sequence analysis of all 41 known ZIKV RNA open reading frames to date indicates that ZIKV has undergone significant changes in both protein and nucleotide sequences during the past half century.
Zika virus transmission is primarily vector-borne, mainly via Aedes mosquitoes. The virus can also be found in various body fluids and transmission by sexual contact has also been reported. Aedes aegypti, the principal vector, is found in tropical and subtropical climates and adapts well to urban areas, living in and around human habitations. The areas affected by Zika virus lie within areas af...
An ecological survey of dengue vector mosquitos was carried out in June 2000 in central Lao PDR. Two areas in Khammouane Province, Nongbok and Thakhek, were selected for the survey. Of the 7 mosquito species identified, Aedes aegypti was dominant in both study areas. The container index for Ae. aegypti in Nongbok was 51.8% and was significantly higher than that of Thakhek (40.2%); moreover, sig...
Ngari virus (NRIV) is a recently described, naturally occurring reassortant between two other orthobunyaviruses, Bunyamwera virus (BUNV) and Batai virus (BATV). Intriguingly, this reassortment was associated with the acquisition of heightened virulence, although the molecular basis for this is not understood. Here we report the first complete genome sequences of Ngari virus. We include five iso...
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