Neonatal anaplasmosis in a calf

Norton, J. H.; Parker, R.; Forbes-Faulkner, J.C.

doi:10.1111/j.1751-0813.1983.tb02844.x

Cited by 12 publications

(14 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The transplacental transmission of A. marginale is the most common, being described extensively in experimental studies, including longitudinal studies (Norton et al, 1983;Potgieter and Van Rensburg, 1987;Ribeiro et al, 1995;Pypers et al, 2011;Maldonado et al, 2012;Grau et al, 2013;Silva et al, 2015). It mainly occurs between the second and third trimesters of pregnancy (Fowler and Swift, 1975;Paumer, 1976, 1978;Zaugg and Kuttler, 1984;Zaugg, 1985;Potgieter and Van Rensburg, 1987;Ribeiro et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Transplacental transmission of bovine tick-borne pathogens: Frequency, co-infections and fatal neonatal anaplasmosis in a region of enzootic stability in the northeast of Brazil

Costa

Magalhães

Oliveira³

et al. 2016

Ticks and Tick-borne Diseases

View full text Add to dashboard Cite

Bovine tick-borne disease (TBD) constitutes a worldwide group of diseases that result in great losses for dairy and beef cattle. With regard to the epidemiological profile of the diseases, the importance of transplacental transmission is still not very well understood. The aim of this study was to determine the transplacental transmission of TBD agents (Anaplasma marginale, Babesia bovis and B. bigemina) in a herd of dairy cattle that had been naturally infected in an area of enzootic stability in northeastern Brazil. Blood for serology of the three agents was collected from cows within 120 days of gestation and serology, haemogram and nPCR assays were performed after birth. Blood was collected from the calves within 3h of birth, and haemogram and nPCR assays were performed in all animals. Pre-colostrum serology was achieved in 34 animals. The Student's t-test was used to compare the haemogram results between animals that were positive and negative for the haemoparasites. The cows were seropositive for all agents in at least one of the examinations. We detected 15 cases of vertical transmission of A. marginale, 4 of B. bovis and 2 of B. bigemina in the 60 cows. In infected animals, co-infection was detected for A. marginale and B. bovis in 1 of 60 calves, and a triple infection was detected in one other calf. Fatal neonatal anaplasmosis was observed in 1 of 15 calves, in which death occurred within 24h of birth. From the results, we concluded that transplacental transmission of TBD agents occurs, including in cases of co- and triple-infection. Such transplacental transmission can cause neonatal death, increasing the importance of this form of epidemiological transmission and suggesting its role as a cause of undiagnosed neonatal death.

show abstract

Section: Introductionmentioning

confidence: 99%

Transplacental transmission of bovine tick-borne pathogens: Frequency, co-infections and fatal neonatal anaplasmosis in a region of enzootic stability in the northeast of Brazil

Costa

Magalhães

Oliveira³

et al. 2016

Ticks and Tick-borne Diseases

View full text Add to dashboard Cite

show abstract

“…ransmissão transplacentária. A transmissão transplacentária tem sido notificada, com certa freqüência (Uilenberg 1968, Swift & Paumer 1976, Paine & Miller 1977, Norton et al 1983, Passos & Lima 1984, Zaugg & Kuttler 1984, Zaugg 1985, Potgieter & Van Rensburg 1987, Ribeiro et al 1995, Benesi et al 1999. Na maioria dos casos os fetos foram infectados quando a vaca havia sido infectada durante o perí-odo de gestação.…”

unclassified

“…Na maioria dos casos os fetos foram infectados quando a vaca havia sido infectada durante o perí-odo de gestação. Entretanto, os casos reportados por Norton et al (1983), Potgieter & Van Rensburg (1987), Ribeiro et al (1995) sugerem que a transmissão intra-uterina ou transplacentária pode ocorrer em vacas portadoras crônicas. T T T T Transmissão por insetos hematófagos.…”

unclassified

Considerações sobre a transmissão de Anaplasma marginale

Kessler¹

2001

Pesq. Vet. Bras.

View full text Add to dashboard Cite

“…In addition to mechanical and biological transmission, A. marginale can be transmitted from cow to calf transplacentally during gestation (111,176,177). For example, a 15.6% prevalence rate of in utero transmission of Anaplasma infections was reported in South Africa (135).…”

Section: Introduction Bovine Anaplasmosismentioning

confidence: 99%

Antigens and Alternatives for Control ofAnaplasma marginaleInfection in Cattle

et al. 2003

View full text Add to dashboard Cite

Anaplasmosis, a tick-borne cattle disease caused by the rickettsia Anaplasma marginale, is endemic in tropical and subtropical areas of the world. The disease causes considerable economic loss to both the dairy and beef industries worldwide. Analyses of 16S rRNA, groESL, and surface proteins have resulted in the recent reclassification of the order Rickettsiales. The genus Anaplasma, of which A. marginale is the type species, now also includes A. bovis, A. platys, and A. phagocytophilum, which were previously known as Ehrlichia bovis, E. platys, and the E. phagocytophila group (which causes human granulocytic ehrlichiosis), respectively. Live and killed vaccines have been used for control of anaplasmosis, and both types of vaccines have advantages and disadvantages. These vaccines have been effective in preventing clinical anaplasmosis in cattle but have not blocked A. marginale infection. Thus, persistently infected cattle serve as a reservoir of infective blood for both mechanical transmission and infection of ticks. Advances in biochemical, immunologic, and molecular technologies during the last decade have been applied to research of A. marginale and related organisms. The recent development of a cell culture system for A. marginale provides a potential source of antigen for the development of improved killed and live vaccines, and the availability of cell culture-derived antigen would eliminate the use of cattle in vaccine production. Increased knowledge of A. marginale antigen repertoires and an improved understanding of bovine cellular and humoral immune responses to A. marginale, combined with the new technologies, should contribute to the development of more effective vaccines for control and prevention of anaplasmosis

show abstract

Neonatal anaplasmosis in a calf

Cited by 12 publications

References 4 publications

Transplacental transmission of bovine tick-borne pathogens: Frequency, co-infections and fatal neonatal anaplasmosis in a region of enzootic stability in the northeast of Brazil

Transplacental transmission of bovine tick-borne pathogens: Frequency, co-infections and fatal neonatal anaplasmosis in a region of enzootic stability in the northeast of Brazil

Considerações sobre a transmissão de Anaplasma marginale

Antigens and Alternatives for Control ofAnaplasma marginaleInfection in Cattle

Contact Info

Product

Resources

About