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Conjunctival attachment of a tick: clinicopathologic report of a case.

Attachment by ticks to ocular surfaces is uncommon, but has been reported. The objective of this article is to describe a case of conjunctival tick attachment and a method for removal by conjunctival excision. A 39-year-old man presented to the Emergency Department with a complaint of foreign-body sensation in his right eye. He was found to have a live tick embedded in his conjunctiva. The tick was removed en bloc with surrounding conjunctiva by an ophthalmologist. The arthropod was identified as the larval stage of the Lone Star tick (Amblyomma americanum). The patient did not experience any …

Orally active acaricidal peptide toxins from spider venom.

Numerous species of ticks and mites (collectively known as acarines) are serious pests of animals, humans, and crops. There are few commercially available acaricides and major classes of these chemicals continue to be lost from the marketplace due to resistance development or deregistration by regulatory agencies. There is consequently a pressing need to isolate new and safe acaricidal compounds. In this study, we show that two families of peptide neurotoxins isolated from the venom of the Australian funnel-web spider Hadronyche versuta are lethal to the lone star tick Amblyomma americanum. Th…

Health evaluation of a radiocollared population of free-ranging Baird's tapirs (Tapirus bairdii) in Costa Rica.

The health of a population of free-ranging tapirs (Tapirus bairdii) inhabiting Corcovado National Park, Costa Rica, was assessed as part of an ongoing ecologic study. Nineteen tapirs were immobilized between March 1997 and February 2000, and samples of blood, skin biopsies, and ectoparasites were collected. Ticks were identified as Amblyomma oblongoguttatum or A. coelebs. Hematology and serum biochemistry results suggest statistically significant differences between free-ranging and captive populations that should be interpreted with caution in view of inherent environmental differences betwee…

[Changes in the bactericidal activity of the cementing fraction in ixodid tick saliva under the influence of the presence of the tick-borne encephalitis virus].

It is demonstrated that the abundance of bactericidal compounds in the salivary cement plug of ixodid ticks is changing under the influence of virulent tick-borne encephalitis virus (TBEV) reproduction in their bodies. TBEV infected Ixodes persulcatus cement plug-forming lytic zone size enlarged in comparison with the naive tick one whereas Micrococcus lysodeikticus lytic zones induced by the cement plug of TBEV infected Amblyomma hebraeum nymphs or Rhipicephalus appendiculatus females reduced compared with produced by noninfected specimens. It is supposed that increasing of the lysozyme that …

Resistance of Brahman and Hereford cattle to African ticks with reference to serum gamma globulin levels and blood composition.

Field collections of ticks from two breeds of cattle showed that the common species of ticks were Amblyomma hebraeum, Rhipicephalus appendiculatus and Rhipicephalus evertsi evertsi. The density of these species was higher on Hereford than on Brahman cattle. The results also indicated that the density of immature stages of the above-mentioned ticks is higher on Hereford than on Brahman cattle. A positive correlation was found between the number of ticks on the cattle and the serum gamma globulin levels, an indication of an increase in the production of antibodies. An inverse relationship was fo…

Regulation of body volume by salivation in a tick challenged with fluid loads.

Injection into the hemolymph of 1.2% NaCl, 11.2% sucrose, 2.3% urea (all approximately isosmotic to hemolymph), or distilled water induced salivary fluid secretion in the ixodid tick Amblyomma hebraeum Koch. Saline gave the largest response at high doses. Injection of hyperosmotic NaCL into the hemolymph did not induce salivation but led to the drinking of distilled water in amounts sufficient to dilute the salt load to isosmolarity. Atropine only partially inhibited salivation induced by NaCl, sucrose, and distilled water. Reserpine markedly inhibited salivation induced by NaCl. We propose th…

Seroprevalence of Coxiella burnetii and potential tick vectors infesting domestic ruminants and community perception of the disease in pastoral areas of south Omo zone, southern Ethiopia.

BACKGROUND: Q fever is a worldwide occurring neglected zoonotic disease with great economic importance. The etiological agent, Coxiella burn … seropositive (OR = 2.15, p = 0.000). A total of nine different tick species were identified, namely Amblyomma variegatum (Am. variegatum) with 26.3% (342; 217 males, 101 females and 24 nymphs), Amblyomma cohaerens (Am. cohaerens) with 47.96% (370 males, 253 females), Amblyomma gemma (Am. gemma) with 4.00% (52; 29 males, 23 female), Rhipicephalus pulchellus …

Bacterial agents in 248 ticks removed from people from 2002 to 2013.

A retrospective study was conducted to analyze the tick species removed from people and to detect tick-infecting bacteria in the specimens collected over the past 10 years at the reference center for rickettsioses, Marseille, France. A total of 248 ticks were removed from 200 people, including Dermacentor (73), Rhipicephalus (67), Ixodes (60), Amblyomma (8), Argas (3), Hyalomma (1), and Haemaphysalis (1) species. Bacterial DNA was detected in 101 ticks: Rickettsia slovaca (34%) and Rickettsia raoultii (23%) were detected in Dermacentor ticks; Rickettsia conorii (16%) and Rickettsia massiliae (…

Tick-borne trauma: an unusual presentation of anaplasmosis.

INTRODUCTION: Tick-borne diseases present a special problem in Connecticut and the Northeastern United States. The tick species Ixodes scapularis known for Lyme disease may also infect humans with anaplasmosis, while other tick species [Amblyomma spp.] may transmit ehrlichiosis. These illnesses may present in various ways depending on the virulence of the organism and variable host factors. CASE PRESENTATION: Our patient presented as a motor vehicle trauma presumably from encephalopathy secondary to anaplasmosis. Unusual features of the patient's case led to the causative diagnosis on periphe…

Ectoparasitic and phoretic arthropods of Virginia opossums (Didelphis virginiana) in central Tennessee.

Thirteen species of ectoparasitic (12) or phoretic (1) arthropods were collected from 26 adult Virginia opossums, Didelphis virginiana, live … as collected were Cediopsylla simplex, Ctenophthalmus pseudagyrtes, and Orchopeas howardi. The tick Amblyomma americanum, the myobiid mite Archemyobia inexpectatus, and the trombiculid (chigger) mites Eutrombicula splendens, Leptotrombidium peromysci (first record from this host) and Neotrombicula cavicola (first record from this host), were also recorded. …

Rickettsia parkeri: a newly recognized cause of spotted fever rickettsiosis in the United States.

Ticks, including many that bite humans, are hosts to several obligate intracellular bacteria in the spotted fever group (SFG) of the genus Rickettsia. Only Rickettsia rickettsii, the agent of Rocky Mountain spotted fever, has been definitively associated with disease in humans in the United States. Herein we describe disease in a human caused by Rickettsia parkeri, an SFG rickettsia first identified >60 years ago in Gulf Coast ticks (Amblyomma maculatum) collected from the southern United States. Confirmation of the infection was accomplished using serological testing, immunohistochemical stai…

Ticks (Acari: Ixodidae) on wild animals from the Porto-Primavera Hydroelectric power station area, Brazil.

From June 2000 to June 2001, a total of 741 ticks were collected from 51 free-living wild animals captured at the Porto-Primavera Hydroelectric power station area, located alongside an approximately 180 km course of the Paran river, between the states of S o Paulo and Mato Grosso do Sul, comprising 9 species of 3 genera: Ambly-omma (7 species), Boophilus (1) and Anocentor (1). A total of 421 immature Amblyomma ticks were reared in laboratory until the adult stage, allowing identification of the species. A. cajennense was the most frequent tick species (mostly immature stages) collected on 9 ho…

Detection of Rickettsia spp. in Ticks from Domestic Dogs Living in Seven Major Indigenous Communities of Rio de Janeiro State, Brazil.

(1) Background: Although Brazilian indigenous communities of Rio de Janeiro State, southeastern Brazil, have been mostly located in conserva … seven indigenous communities, had 171 dogs examined, 26 infested, yielding 70 ticks (predominantly Amblyomma ovale, 60/70 (85.7%), with Rickettsia detected in ticks from two communities and sequencing identifying Rickettsia parkeri strain Atlantic Rainforest. Molecular analyses revealed 19/70 (27.1%) A. ovale positive to Rickettsia parkeri strain Atlantic …

Prevalence and diversity of spotted fever group Rickettsia species in ixodid ticks from domestic dogs in Chad, Africa.

Tick-borne pathogens in the genus Rickettsia are the causative agents of severe and potentially fatal spotted fever group (SFG) and typhus g … of this study was to characterize the SFG Rickettsia prevalence and diversity in ixodid ticks (104 Amblyomma spp., 160 Rhipicephalus spp., and one Hyalomma truncatum) collected from domestic dogs in Chad, Africa. Ticks were screened for Rickettsia spp. using a nested PCR targeting the 17-kDa gene. Species identification was through bidirectional Sanger seq …

Identification and Characterization of Ectoparasite-Borne Pathogens Through Vector and Animal Surveillance in Andean Countries, South America.

Infectious diseases transmitted by ectoparasites such as fleas, lice, mites, and ticks constitute a global public health problem. Tick-borne … h fewer species of Anaplasma, Bartonella, Borrelia, Ehrlichia, Coxiella, and Phlebovirus pathogens. Amblyomma, Dermacentor, Rhipicephalus, and Ixodes ticks were reported as the most predominant ectoparasites found infected with a diversity of EBP belonging to Rickettsia, Babesia, Anaplasma, Bartonella, and Ehrlichia species. Overall, people living in rural …

Особенности бразильской лихорадки наблюдались в двух различных эндемических районах Бразилии.

Бразильская пятнистая лихорадка (BSF), вызванная Рикитсией рикеттсии, является наиболее важным рикетциозом и единственным сообщаемым заболеванием, передаваемым тиками в Бразилии. В Бразилии наиболее важным вектором BSF является < < Жесткая клеща > > , однако в штате Сан-Паулу А. ауреолатум был также признан в качестве векторного вида в оставшихся районах Атлантического океана вблизи столичного района города Сан-Паулу. Мы проанализировали клинические и эпидемиологические особенности дел BSF в двух различных областях, где векторами, инкриминируемыми в качестве векторов, являются A. c

Совпадение в аннотации оригинала
Brazilian spotted fever (BSF) caused by Rickettsia rickettsii is the most important rickettsiosis and the only reportable tick-borne disease in Brazil. In Brazil, the hard tick Amblyomma cajennense is the most important BSF vector; however, in São Paulo State, A. aureolatum was also recognized as a vector species in remaining Atlantic forest areas near the m…

Rickettsia parkeri Rickettsiosis, Argentina.

Rickettsia parkeri, a recently identified cause of spotted fever rickettsiosis in the United States, has been found in Amblyomma triste ticks in several countries of South America, including Argentina, where it is believed to cause disease in humans. We describe the clinical and epidemiologic characteristics of 2 patients in Argentina with confirmed R. parkeri infection and 7 additional patients with suspected R. parkeri rickettsiosis identified at 1 hospital during 2004-2009. The frequency and character of clinical signs and symptoms among these 9 patients closely resembled those described fo…

Geographical distribution of ticks in Turkey.

Turkey's tick fauna is composed of about 32 species in two families and ten genera in mammals, reptiles, and birds. The ticks of veterinary significance in the family Ixodidae comprise seven genera with 28 different species. Ixodes spp. are mostly seen in northern Turkey. It is likely that the high rainfall and the intensive forest in this area may contribute to this observation. To date, the following species have been found to be sporadically present: Amblyomma variegatum in Hatay province (border to Syria), Boophilus kohlsi in southeastern Turkey (border of Syria), Ornithodorus in Central a…

Evidence of rickettsial spotted fever and ehrlichial infections in a subtropical territory of Jujuy, Argentina.

Between November 1993 and March 1994, a cluster 6 pediatric patients with acute febrile illnesses associated with rashes was identified in J … antibodies reactive with Rickettsia rickettsii, 15 with Ehrlichia chaffeensis, and 1 with R. typhi. Amblyomma cajennense, a known vector of R. rickettsii in South America, was collected from pets and horses in the area. These results are the first to document rickettsial spotted fever and ehrlichial infections in Argentina.

Ectoparasitic fauna of poultry in Nsukka, Nigeria.

An investigation which lasted for a period of one calendar year was mounted to determine common ectoparasitic fauna of poultry in Nsukka, Ni … 5.0%), Menacanthus stramineus (20.0%), Lipeurus caponis (25.0%), Ceratophyllus gallinae (25.0%) and Amblyomma sp. (15.0%). The veterinary importance of these ectoparasites are highlighted and possible control measures against ectoparasitic build up in poultry houses recommended.