Rickettsia parkeri infecting free-living Amblyomma triste ticks in the Brazilian Pantanal

2015 ◽  
Vol 6 (3) ◽  
pp. 237-241 ◽  
Author(s):  
Andréia L.T. Melo ◽  
Alvair S. Alves ◽  
Fernanda A. Nieri-Bastos ◽  
Thiago F. Martins ◽  
Rute Witter ◽  
...  
Keyword(s):  
Free Living ◽  
Rickettsia Parkeri ◽  
Amblyomma Triste ◽  
Brazilian Pantanal

scholarly journals Comparative Evaluation of Infected and NoninfectedAmblyomma tristeTicks withRickettsia parkeri, the Agent of an Emerging Rickettsiosis in the New World

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
F. A. Nieri-Bastos ◽  
M. P. J. Szabó ◽  
R. C. Pacheco ◽  
J. F. Soares ◽  
H. S. Soares ◽  
...  
Keyword(s):  
Infected Group ◽  
Control Group ◽  
Control Groups ◽  
Rickettsia Parkeri ◽  
Amblyomma Triste ◽  
Vertebrate Hosts ◽  
Domestic Rabbits ◽  
And Control ◽  
Term Maintenance

The distribution ofRickettsia parkeriin South America has been associated withAmblyomma tristeticks. The present study evaluated under laboratory conditions two colonies ofA. triste: one started from engorged females that were naturally infected byR. parkeri(designated as infected group); the other started from noninfected females (designated as control group). Both colonies were reared in parallel for five consecutive generations. Tick-naïve domestic rabbits were used for feeding of each tick stage and generation.R. parkeriwas preserved by transstadial maintenance and transovarial transmission inA. tristeticks for five consecutive generations, because all tested larvae, nymphs, and adults from the infected group were shown by PCR to contain rickettsial DNA. All rabbits infested by larvae, nymphs, and adults from the infected group seroconverted, indicating that these tick stages were all vector competent forR. parkeri. Expressive differences in mortality rates were observed between engorged nymphs from the infected and control groups, as indicated by 65.9% and 92.4% molting success, respectively. Our results indicate thatA. tristecan act as a natural reservoir forR. parkeri. However, due to deleterious effect caused byR. parkerion engorged nymphs, amplifier vertebrate hosts might be necessary for natural long-term maintenance ofR. parkeriinA. triste.

scholarly journals Exposure of free-living jaguars to Toxoplasma gondii, Neospora caninum and Sarcocystis neurona in the Brazilian Pantanal

2014 ◽  
Vol 23 (4) ◽  
pp. 547-553 ◽  
Author(s):  
Selma Samiko Miyazaki Onuma ◽  
Andréia Lima Tomé Melo ◽  
Daniel Luis Zanella Kantek ◽  
Peter Gransden Crawshaw-Junior ◽  
Ronaldo Gonçalves Morato ◽  
...  
Keyword(s):  
Toxoplasma Gondii ◽  
Neospora Caninum ◽  
Antibody Test ◽  
Free Living ◽  
Sarcocystis Neurona ◽  
Mato Grosso ◽  
Apicomplexan Parasites ◽  
Wide Range ◽  
Coccidian Parasites ◽  
Brazilian Pantanal

Toxoplasma gondii, Neospora caninum and Sarcocystis neurona are related apicomplexan parasites that cause reproductive and neurological disorders in a wide range of domestic and wild animals. In the present study, the immunofluorescence antibody test (IFAT) was used to investigate the presence of antibodies against T. gondii, N. caninum and S. neurona in the sera of 11 free-living jaguars (Panthera onca) in two protected areas in the Pantanal region of Mato Grosso state, Brazil. Ten jaguars (90.9%) showed seropositivity for T. gondii, eight (72.7%) for S. neurona, and seven (63.6%) for N. caninum antigens. Our findings reveal exposure of jaguars to these related coccidian parasites and circulation of these pathogens in this wild ecosystem. To the best of our knowledge, this is the first serological detection of N. caninum and S. neurona in free-living jaguars.

In vitro isolation and infection intensity of Rickettsia parkeri in Amblyomma triste ticks from the Paraná River Delta region, Argentina

2014 ◽  
Vol 5 (6) ◽  
pp. 924-927 ◽  
Author(s):  
Lucas D. Monje ◽  
Santiago Nava ◽  
Leandro R. Antoniazzi ◽  
Valeria C. Colombo ◽  
Pablo M. Beldomenico
Keyword(s):  
Infection Intensity ◽  
Paraná River ◽  
River Delta ◽  
Delta Region ◽  
Rickettsia Parkeri ◽  
Parana River ◽  
Amblyomma Triste

Amblyomma triste Koch, 1844 (Acari: Ixodidae): Hosts and seasonality of the vector of Rickettsia parkeri in Uruguay

2008 ◽  
Vol 155 (1-2) ◽  
pp. 104-109 ◽  
Author(s):  
J.M. Venzal ◽  
A. Estrada-Peña ◽  
O. Castro ◽  
C.G. de Souza ◽  
M.L. Félix ◽  
...  
Keyword(s):  
Rickettsia Parkeri ◽  
Amblyomma Triste

scholarly journals Avian Migrants Facilitate Invasions of Neotropical Ticks and Tick-Borne Pathogens into the United States

2015 ◽  
Vol 81 (24) ◽  
pp. 8366-8378 ◽  
Author(s):  
Emily B. Cohen ◽  
Lisa D. Auckland ◽  
Peter P. Marra ◽  
Sarah A. Hamer
Keyword(s):  
United States ◽  
Migratory Birds ◽  
Spotted Fever ◽  
Animal Health ◽  
The United States ◽  
Etiologic Agent ◽  
Rickettsia Parkeri ◽  
Blood Samples ◽  
Content Type ◽  
Amblyomma Triste

ABSTRACTMigratory birds have the potential to transport exotic vectors and pathogens of human and animal health importance across vast distances. We systematically examined birds that recently migrated to the United States from the Neotropics for ticks. We screened both ticks and birds for tick-borne pathogens, includingRickettsiaspecies andBorrelia burgdorferi. Over two spring seasons (2013 and 2014), 3.56% of birds (n= 3,844) representing 42.35% of the species examined (n= 85) were infested by ticks. Ground-foraging birds with reduced fuel stores were most commonly infested. Eight tick species were identified, including seven in the genusAmblyomma, of which onlyAmblyomma maculatum/Amblyomma tristeis known to be established in the United States. Most ticks on birds (67%) were neotropical species with ranges in Central and South America. Additionally, a singleIxodesgenus tick was detected. A total of 29% of the ticks (n= 137) and no avian blood samples (n= 100) were positive for infection withRickettsiaspecies, includingRickettsia parkeri, an emerging cause of spotted fever in humans in the southern United States, a species in the group ofRickettsiamonacensis, and uncharacterized species and endosymbionts of unknown pathogenicity. No avian tick or blood samples tested positive forB. burgdorferi, the etiologic agent of Lyme disease. An extrapolation of our findings suggests that anywhere from 4 to 39 million exotic neotropical ticks are transported to the United States annually on migratory songbirds, with uncertain consequences for human and animal health if the current barriers to their establishment and spread are overcome.

Clinical and epidemiological comparison of Rickettsia parkeri rickettsiosis, related to Amblyomma triste and Amblyomma tigrinum, in Argentina

2020 ◽  
Vol 11 (4) ◽  
pp. 101436 ◽  
Author(s):  
Yamila Romer ◽  
Pablo Borrás ◽  
Francisco Govedic ◽  
Santiago Nava ◽  
José Ignacio Carranza ◽  
...  
Keyword(s):  
Rickettsia Parkeri ◽  
Amblyomma Triste ◽  
Amblyomma Tigrinum

scholarly journals Complementary data on four methods for sampling free-living ticks in the Brazilian Pantanal

2014 ◽  
Vol 23 (4) ◽  
pp. 516-521 ◽  
Author(s):  
Vanessa do Nascimento Ramos ◽  
Carolina Fonseca Osava ◽  
Ubiratan Piovezan ◽  
Matias Pablo Juan Szabó
Keyword(s):  
Carbon Dioxide ◽  
Simple Technique ◽  
Plant Litter ◽  
Tick Population ◽  
Free Living ◽  
Large Numbers ◽  
Amblyomma Parvum ◽  
Visual Searches ◽  
Carbon Dioxide Co2 ◽  
Brazilian Pantanal

In this study, four methods for sampling free-living ticks that are used in ecological and human tick-bite risk studies were evaluated. Cloth dragging, carbon dioxide traps and visual searches and inspection of plant litter on the ground were used in field and forest areas within the Brazilian Pantanal. Among the three tick species collected, Amblyomma sculptum predominated, followed by Amblyomma parvum and Amblyomma ovale. Dragging, a cheap and simple technique, yielded the highest numbers of ticks, particularly nymphs. The visual search detected a high number of adult ticks and provided information on tick questing height. Even though laborious, plant litter examination showed that large numbers of ticks may use this stratum. Carbon dioxide (CO2) traps are expensive and difficult to handle, but they are highly efficient for adult ticks, especially A. parvum. These data indicate that one method alone is incapable of providing a representative sample of the tick fauna in a particular area and that multiple techniques should be used for tick population studies.

Ultrastructure of neuromuscular relationships in the canine heartworm (dirofilaria immitis)

1986 ◽  
Vol 44 ◽  
pp. 278-279
Author(s):  
W. L. Steffens ◽  
Nancy B. Roberts ◽  
J. M. Bowen
Keyword(s):  
Dirofilaria Immitis ◽  
Domestic Dogs ◽  
Structural Description ◽  
Pharmacological Effects ◽  
Free Living ◽  
Canine Heartworm ◽  
The World ◽  
Synaptic Region ◽  
Muscle Innervation ◽  
Insight Into

The canine heartworm is a common and serious nematode parasite of domestic dogs in many parts of the world. Although nematode neuroanatomy is fairly well documented, the emphasis has been on sensory anatomy and primarily in free-living soil species and ascarids. Lee and Miller reported on the muscular anatomy in the heartworm, but provided little insight into the peripheral nervous system or myoneural relationships. The classical fine-structural description of nematode muscle innervation is Rosenbluth's earlier work in Ascaris. Since the pharmacological effects of some nematacides currently being developed are neuromuscular in nature, a better understanding of heartworm myoneural anatomy, particularly in reference to the synaptic region is warranted.

Sign in / Sign up

Export Citation Format

Share Document