| susceptibility of the cat flea (siphonaptera: pulicidae) to pyrethroids. | adult cat fleas, ctenocephalides felis felis (bouché), from two laboratory colonies (one originating in california and one from florida) were exposed to residues of eight pyrethroids to compare their susceptibilities. the florida strain was more tolerant than the california strain, with 6.8-, 5.2-, and 4.8-fold tolerance to cyfluthrin, cypermethrin, and fluvalinate, respectively. the florida strain showed less than 3-fold tolerance to the other five insecticides (permethrin, tralomethrin, d-phen ... | 1989 | 2754097 |
| murine typhus: an unrecognized suburban vectorborne disease. | murine typhus, an acute febrile illness caused by rickettsia typhi, is distributed worldwide. mainly transmitted by the fleas of rodents, it is associated with cities and ports where urban rats (rattus rattus and rattus norvegicus) are abundant. in the united states, cases are concentrated in suburban areas of texas and california. contrary to the classic rat-flea-rat cycle, the most important reservoirs of infection in these areas are opossums and cats. the cat flea, ctenocephalides felis, has ... | 2008 | 18260783 |
| rickettsia felis infection rates in an east texas population. | murine typhus (rickettsia typhi), endemic in southern california and south texas, is maintained within a host-vector system consisting of the opossum and cat flea. in the early 1990s, a second rickettsial species, rickettsia felis, was also found to be maintained within the opossum-cat flea system and is, in fact, found more commonly than r. typhi in the opossum and cat flea. recognized as a human pathogen in 1994, r. felis causes an infection that produces symptoms indistinguishable from classi ... | 2005 | 16130886 |
| insecticide susceptibilities of cat fleas (siphonaptera: pulicidae) from several regions of the united states. | eleven cat flea, ctenocephalides felis (bouchè), strains, seven field-collected and four laboratory-colonized, were assayed for susceptibilities to five insecticides (carbaryl, chlorpyrifos, malathion, permethrin, and pyrethrin) with an insecticide-treated, horizontally-oriented, nylon 6,6 disk in a test tube. the pyrethrin was synergized using piperonyl butoxide (pbo). flea mortality at two doses was recorded after 4 and 24 h exposures. the field strains from texas and florida tolerated carbary ... | 2002 | 12349857 |
| ownership of cats or dogs does not increase exposure to rickettsia typhi. | in the united states, murine typhus (rickettsia typhi) is endemic in southern california and south texas. evidence indicates the natural host/vector system is the opossum and cat flea, the most common flea on both cats and dogs, and speculation suggests that pet contact may pose a risk for r typhi exposure. serum from 140 subjects was tested for rickettsial antibodies by an enzyme-linked immunosorbent assay that used an r typhi antigen. each subject was asked about pet contact status and placed ... | 2002 | 12073903 |
| laboratory evaluation of fipronil and imidacloprid topical insecticides for control of the plague vector oropsylla montana (siphonaptera: ceratophyllidae) on california ground squirrels (rodentia: sciuridae). | two insecticides, fipronil and imidacloprid, were evaluated for efficacy and longevity against oropsylla montana (baker), the most important vector of plague in california. wild-caught california ground squirrels, spermophilus beecheyi (richardson), were individually housed in the laboratory to serve as natural hosts to o. montana and for on-animal insecticide trials. several concentrations oftechnical grade fipronil and imidacloprid in acetone were applied to samples of clean rodent bedding to ... | 2002 | 11931250 |
| typhus and typhuslike rickettsiae associated with opossums and their fleas in los angeles county, california. | the recent discovery of cat fleas (ctenocephalides felis) infected with a typhuslike rickettsia (designated the elb agent) raises the question of whether similar rickettsial infections exist in wild cat flea populations. we verified the presence of the elb agent and rickettsia typhi in urban and suburban areas of los angeles, calif. opossums trapped in close proximity to the residences of human murine typhus cases in los angeles county and other areas within the city of los angeles were tested f ... | 1992 | 1629332 |