Publikationsdatenbank

A review of recent research on Theileria parva:
Implications for the infection and treatment vaccination method for control of East Coast fever (2020)

Art

Zeitschriftenartikel / wissenschaftlicher Beitrag

Autoren

Bishop, Richard P.

Odongo, David

Ahmed, Jabbar (WE 13)

Mwamuye, Micky (WE 13)

Fry, Lindsay M.

Knowles, Donald P.

Nanteza, Anne

Lubega, George

Gwakisa, Paul

Clausen, Peter-Henning (WE 13)

Obara, Isaiah (WE 13)

Forschungsprojekt

Molecular epidemiology network for promotion and support of delivery of live vaccines against Theileria parva and Theileria annulata infection in Eastern and Northern Africa

Quelle

Transboundary and emerging diseases

Bandzählung: 67

Heftzählung: S1

Seiten: 56 – 67

ISSN: 1865-1674

Sprache

Englisch

Verweise

URL (Volltext): https://onlinelibrary.wiley.com/doi/full/10.1111/tbed.13325

DOI: 10.1111/tbed.13325

Pubmed: 32174044

Kontakt

Institut für Parasitologie und Tropenveterinärmedizin

Robert-von-Ostertag-Str. 7-13
14163 Berlin
+49 30 838 62310
parasitologie@vetmed.fu-berlin.de

Abstract / Zusammenfassung

The infection and treatment (ITM) live vaccination method for control of Theileria parva infection in cattle is increasingly being adopted, particularly in Maasai pastoralist systems. Several studies indicate positive impacts on human livelihoods. Importantly, the first detailed protocol for live vaccine production at scale has recently been published. However, quality control and delivery issues constrain vaccination sustainability and deployment. There is evidence that the distribution of T. parva is spreading from endemic areas in East Africa, North into Southern Sudan and West into Cameroon, probably as a result of anthropogenic movement of cattle. It has also recently been demonstrated that in Kenya, T. parva derived from cape buffalo can 'breakthrough' the immunity induced by ITM. However, in Tanzania, breakthrough has not been reported in areas where cattle co-graze with buffalo. It has been confirmed that buffalo in northern Uganda national parks are not infected with T. parva and R. appendiculatus appears to be absent, raising issues regarding vector distribution. Recently, there have been multiple field population genetic studies using variable number tandem repeat (VNTR) sequences and sequencing of antigen genes encoding targets of CD8+ T-cell responses. The VNTR markers generally reveal high levels of diversity. The antigen gene sequences present within the trivalent Muguga cocktail are relatively conserved among cattle transmissible T. parva populations. By contrast, greater genetic diversity is present in antigen genes from T. parva of buffalo origin. There is also evidence from several studies for transmission of components of stocks present within the Muguga cocktail, into field ticks and cattle following induction of a carrier state by immunization. In the short term, this may increase live vaccine effectiveness, through a more homogeneous challenge, but the long-term consequences are unknown.