Transovarial transmission of tick-borne encephalitis (TBE) virus in Ixodes ricinus (L., 1758), its vector tick species, has been shown both experimentally and epidemiologically to be one of the important modes of long-term virus circulation in a natural focus (Benda R. 1958: J. Hyg. Epidemiol. Microbiol. Immunol. (Prague) 2: 314-330; Řeháček J. 1962: Acta Virol. 6: 220-226; Danielová V., Holubo...

OBJECTIVE To investigate the role of Anopheles subpictus Grassi as a vector of Japanese encephalitis virus (JEV) transmission in Cuddalore, an area of Tamil Nadu endemic for the disease. METHOD We collected 98 pools (4,900 specimens) of wild adult male An. subpictus mosquitoes outdoors during dusk hours and screened them for JEV antigen by antigen-capture Enzyme Linked Immunosorbent Assay. Ad...

La Crosse (LAC) virus is transmitted horizontally to vertebrates and vertically to progeny by Aedes triseriatus mosquitoes, and in northern midwestern states, this virus overwinters in diapausing eggs of the vector. In Florida, the vector remains active throughout the year and does not diapause. To determine if there is an association between diapause and vertical transmission efficiency of LAC...

BACKGROUND & OBJECTIVES Culex quinquefasciatus is one of the principal vectors of West Nile virus (WNV). The mosquito also acts as a bridge vector as it feeds on both birds and humans. In the background of the recent reports of WNV activity in Kerala and Assam with fatalities, a study was initiated to determine the growth kinetics and transmission mechanisms of three strains of WNV in two popul...

In this study we examined the efficiency of an in vitro feeding technique using glass microcapillaries as a method of establishing rickettsiae-infected lines of ticks. To quantify the volume ingested by ticks during microcapillary feeding, the incorporation of radiolabeled amino acids in tick gut and hemolymph was calculated. Fifteen of 18 ticks consumed between 0.06 and 6.77 microl. However, i...

This study investigated rickettsial infection in Amblyomma auricularium ticks from the state of Pernambuco, northeastern Brazil. An engorged female of A. auricularium collected from a skunk (Conepatus semistriatus) was sent alive to the laboratory, where the female was found through molecular analysis to be infected by Rickettsia amblyommii. This engorged female oviposited, and its offspring wa...

Abstract Spirochetes of the family Borreliaceae are, with one exception, tick-borne pathogens a variety vertebrates. The at present comprises two genera: Borrelia (Swellengrebel), which includes agents relapsing fever, avian spirochetosis, and bovine borreliosis, Borreliella (Gupta et al.), Lyme disease was formerly known as ‘Borrelia burgdorferi sensulato complex’. genera are distinguished not...

BACKGROUND Dengue virus is spread in tropical areas of the world and is the causative agent of dengue fever and dengue hemorrhagic fever. It is horizontally transmitted to humans by infected Aedes mosquitoes, but it is also able to be vertically or transovarially transmitted to insect progeny. OBJECTIVE In this work, we analyzed the vertical transmission of dengue virus in Aedes aegypti mosqu...