| isolation and characterization of salivary antigens from the female tick, dermacentor andersoni. | the salivary glands of ixodid ticks are complex organs which are known to contain the antigens responsible for tick resistance in animals. we have identified a large number of proteins from salivary gland extracts (sge), at least some of which are immunologically recognized by tick resistant animals and which are therefore presumed to be secreted salivary components. during the 6 to 10 day feeding process, a number of these antigens alter in concentration according to individual kinetics, and so ... | 1987 | 3299226 |
| effects of tick infestation on the plaque-forming cell response to a thymic dependent antigen. | strain-2 guinea-pigs were given two five-day infestations with dermacentor andersoni larvae. each exposure consisted of 100 larvae, and the first and second infestations were separated by a seven-day tick-free period. tick-exposed animals were given an intravenous injection with sheep red blood cells (srbc) at selected times during and after infestation: (a) the last, fifth day, of a first exposure, (b) the second day of a second infestation, (c) the fifth day of a second infestation and (d) fou ... | 1985 | 3913388 |
| resistance to ixodid tick infestation induced by administration of tick-tissue culture cells. | primary tissue culture cells of developing larvae of amblyomma americanum were administered to guinea-pigs never previously exposed to ixodid ticks. guinea-pigs were given 1 x 10(6) primary culture cells on days 0, 7 and 21 by subcutaneous injection and challenged with male and female a. americanum on day 35. a significant degree of induced host tick resistance was expressed by reduced engorgement weight of females, reduced oviposition by those females which did obtain a blood meal, and by death ... | 1985 | 4083961 |
| significant changes in epidermal langerhans cells of guinea-pigs infested with ticks (dermacentor andersoni). | resistance to tick feeding has previously been shown to be an acquired, immunologically mediated phenomenon in guinea-pigs, associated with cutaneous basophil hypersensitivity to tick antigens. in this study, langerhans cells (lc) in the epidermis of guinea-pigs were monitored during tick infestations of susceptible and resistant animals. a specific adenosine triphosphatase (atpase) staining technique was used to identify epidermal lc. the numbers of lc decreased significantly around the sites o ... | 1984 | 6228517 |
| in vitro feeding of dermacentor andersoni (stiles): effects of histamine and other mediators. | female dermacentor andersoni were induced to feed on defibrinated bovine blood through fixed mouse skin membranes. their feeding behaviour was recorded electronically, the tick being incorporated into the circuit and acting as a variable resistor during the periods of sucking, salivation and rest. recordings of the feeding behaviour of these ticks were similar to those of ticks feeding on rabbits. known concentrations of histamine, serotonin, dopamine, prostaglandin e1 and prostaglandin f2a were ... | 1983 | 6877868 |
| influence of dermacentor andersoni infestation on lymphocyte responsiveness to mitogens. | | 1982 | 6985018 |
| african swine fever virus infection in the argasid host, ornithodoros porcinus porcinus. | the pathogenesis of african swine fever virus (asfv) infection in ornithodoros porcinus porcinus was examined in nymphal ticks infected with the asfv isolate chiredzi/83/1. at times postinfection (p.i.) ranging from 6 h to 290 days, ticks or dissected tick tissues were titrated for virus and examined ultrastructurally for evidence of virus replication. the asfv infection rate in ticks was 100% in these experiments, and virus infection was not associated with a significant increase in tick mortal ... | 1998 | 9499019 |
| coltiviruses and seadornaviruses in north america, europe, and asia. | coltiviruses are tickborne viruses of the genus coltivirus. the type species, colorado tick fever virus (from north america), has been isolated from patients with flulike syndromes, meningitis, encephalitis, and other severe complications. another coltivirus, eyach virus, has been isolated from ticks in france and germany and incriminated in febrile illnesses and neurologic syndromes. seadornaviruses are endemic in southeast asia, particularly indonesia and china. the prototype virus of the genu ... | 2005 | 16318717 |
| exploring the mialome of ticks: an annotated catalogue of midgut transcripts from the hard tick, dermacentor variabilis (acari: ixodidae). | ticks are obligate blood feeders. the midgut is the first major region of the body where blood and microbes ingested with the blood meal come in contact with the tick's internal tissues. little is known about protein expression in the digestive tract of ticks. in this study, for analysis of global gene expression during tick attachment and feeding, we generated and sequenced 1,679 random transcripts (ests) from cdna libraries from the midguts of female ticks at varying stages of feeding. | 2008 | 19021911 |
| experimental infection of amblyomma aureolatum ticks with rickettsia rickettsii. | we experimentally infected amblyomma aureolatum ticks with the bacterium rickettsia rickettsii, the etiologic agent of rocky mountain spotted fever (rmsf). these ticks are a vector for rmsf in brazil. r. rickettsii was efficiently conserved by both transstadial maintenance and vertical (transovarial) transmission to 100% of the ticks through 4 laboratory generations. however, lower reproductive performance and survival of infected females was attributed to r. rickettsii infection. therefore, bec ... | 2011 | 21529391 |
| distribution of rickettsia rickettsii in ovary cells of rhipicephalus sanguineus (latreille1806) (acari: ixodidae). | abstract: | 2011 | 22117572 |
| dermacentor reticulatus: a vector on the rise. | dermacentor reticulatus is a hard tick species with extraordinary biological features. it has a high reproduction rate, a rapid developmental cycle, and is also able to overcome years of unfavourable conditions. dermacentor reticulatus can survive under water for several months and is cold-hardy even compared to other tick species. it has a wide host range: over 60 different wild and domesticated hosts are known for the three active developmental stages. its high adaptiveness gives an edge to th ... | 2016 | 27251148 |