A dengue type 1 epidemic occurred in Fiji between July 1989 and July 1990. Virus isolation in C6/36 cell cultures and Toxorhynchites mosquitos yielded 36 strains. Of the 3686 cases recorded by the Ministry of Health, 60% involved indigenous Fijians and 37%, Indians. A house-to-house survey revealed that a large majority of patients had classical dengue symptoms and 8% reported haemorrhagic mani...

Notifications of communicable diseases received by NSW Health through to February 2002 are shown in Table 5 and Figure 2. Notably, there have been relatively few reports of Ross River virus infection this season, although Barmah Forest virus infection remained active in the mid North coast. Both these infections are due to arboviruses that are transmitted through the bite of infected mosquitos,...

JAVMA, Vol 234, No. 9, May 1, 2009 M emerging and reemerging human pathogens are derived from animals or from animal tissues, waste, or products. A wide range of species including insects (eg, mosquitos), wild animals (eg, rodents, bats, and monkeys), draft animals (eg, horses and mules), and livestock animals (eg, swine, poultry, and cattle) have been implicated in transmission of various high...

Three strains of Aedes aegypti mosquitos viz (i) CRS, refractory to Chikungunya (CHIK) virus by oral route of infection but susceptible to DDT (2) CSS, susceptible to CHIK virus and also susceptible to DDT (3) CSS-DDTR, susceptible to CHIK virus but resistant to DDT, were examined for the effect of sublethal dosages of DDT and deltamethrin on their fecundity. Biochemical analysis showed that th...

The feedback dynamics from mosquito to human and back to mosquito involve considerable time delays due to the incubation periods of the parasites. In this paper, taking explicit account of the incubation periods of parasites within the human and the mosquito, we first propose a delayed Ross-Macdonald model. Then we calculate the basic reproduction number R0 and carry out some sensitivity analys...