The blacklegged tick (Ixodes scapularis) is an important vector of emerging human pathogens. It has three blood-feeding stages, as follows: larva, nymph, and adult. Owing to inefficient transovarial transmission, at least for the Lyme disease agent (Borrelia burgdorferi), larval ticks rarely hatch infected, but they can acquire infection during their larval blood meal. Nymphal ticks are primari...

The genetic consequences of passing three different strains of La Crosse (LAC) virus orally and transovarially in Aedes triseriatus mosquitoes were examined. Two of the LAC strains (WT LAC and LAC ORI) had been passaged numerous times in cell culture; the third strain (SM1-78) had been passaged only once in suckling mice. Genetic changes were monitored in three regions of the LAC genome after o...

Vesicomyid clams are conspicuous fauna at many deep-sea hydrothermal-vent and cold-seep habitats. All species examined have specialized gill tissue harboring endosymbiotic bacteria, which are thought to provide the hosts' sole nutritional support. In these species mechanisms of symbiont inheritance are likely to be key elements of dispersal strategies. These mechanisms have remained unresolved ...

The distribution of Rickettsia parkeri in South America has been associated with Amblyomma triste ticks. The present study evaluated under laboratory conditions two colonies of A. triste: one started from engorged females that were naturally infected by R. parkeri (designated as infected group); the other started from noninfected females (designated as control group). Both colonies were reared ...

Thelohania solenopsae is a pathogen of the red imported Wre ant, Solenopsis invicta, which debilitates queens and eventually causes the demise of colonies. Reductions of infected Weld populations signify its potential usefulness as a biological control agent. Thelohania solenopsae can be transmitted by introducing infected brood into a colony. The social forms of the Wre ant, that is, monogyny ...

Ticks are potent vectors of many deadly human and animal pathogens. Tick-borne babesiosis is a well-recognized malaria-like disease that occurs worldwide and recently has attracted increased attention as an emerging zoonosis. Although the proliferation of Babesia organisms is essential in the vectors, their detailed lifecycle with time information for migration in ticks remains unknown. A novel...

This paper investigates a RVF epidemic model by qualitative analysis and numerical simulations. Qualitative analysis have been used to explore the stability dynamics of the equilibrium points while visualization techniques such as bifurcation diagrams, Poincaré maps, maxima return maps and largest Lyapunov exponents are numerically computed to confirm further complexity of these dynamics induce...

A survey of Bartonella spp. from 275 rats purchased in food markets (n=150) and trapped in different ecosystems (rice field, forest, and animal farms) (n=125) was carried out during October, 2012-March, 2013, in the Mekong Delta of Vietnam. The overall Bartonella spp. prevalence detected by culture and PCR in blood was 14.9% (10.7-19.1%), the highest corresponding to Rattus tanezumi (49.2%), fo...

One cannot but point out that the variety of topics related to zoonoses, and in particular zoonoses transmitted by ticks, is fascinating and ranges from environmental to clinical sciences, also in emergency situations, from veterinary sciences to human epidemiology, in a finely woven network of interactive ecological, social and health factors. Anthropic and cultural factors are correlated to t...

Nowadays, Dengue Haemorrhagic Fever (DHF) is still a significant health problem. Including in Kupang City. The existence of transovarial infection virus essential to know support the prevention be more effective and efficient. This study aimed determine infectious serotypes variability Aedes sp observational research took place nine villages City 2017. Where 20 houses each village are observed ...