dc.contributor.author
Chuluun, Saruultuja
dc.date.accessioned
2018-06-08T00:01:25Z
dc.date.available
2001-12-20T00:00:00.649Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/11343
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-15541
dc.description
Titelblatt, Inhaltsverzeichnis, Lebenslauf
1\. Einleitung
2\. Eigene Untersuchungen
3\. Ergebnisse
4\. Diskussion
5\. Zusammenfassung
6\. Summary
7\. Literaturverzeichnis und Anhang
dc.description.abstract
Trypanosoma equiperdum (Doflein, 1901) ist der Erreger der Beschalseuche. Die
Beschalseuche ist eine gewohnlich chronisch verlaufende, venerische
Infektionskrankheit der Equiden, die sich anfanglich klinisch in einer
ortlichen Entzundung der außeren Geschlechtsteile, spater in lokalen,
subkutanen odematosen Schwellungen sowie Lahmungserscheinungen außert. Als
einziger Vertreter der Gattung Trypanosoma wird Trypanosoma equiperdum
ausschließlich durch den Deckakt ubertragen. Die Beschalseuche ist in
Deutschland eine nach tierseuchenrechtlichen Vorschriften anzeigepflichtige
Infektionskrankheit.
Pferde spielen eine große sozio-okonomische Rolle in der Mongolei. Sie dienen
als Reit- und als Arbeitstiere in Verbindung mit der Schaf-, Ziegen- und
Rinderhaltung. Im Weltmaßstab, nach den USA, Mexico, Brasilien, Argentinien
und China, nimmt die Mongolei den siebenten Platz in der Pferdehaltung ein. Im
Jahre 1998 lag der nationale Bestand bei 3,1 Millionen Tieren.
Bisher liegen keine Untersuchungen uber das Vorkommen und die Verbreitung von
Trypanosoma equiperdum-Infektionen bei Pferden in der Mongolei vor.
Die serologischen Untersuchungen dieser Arbeit sollen Basisdaten zur weiteren
Aufklarung der Epidemiologie der Trypanosoma equiperdum-Infektion bei Pferden
in der Mongolei liefern. Das Ziel der Untersuchungen war die Ermittlung der
serologischen Pravalenz von Trypanosoma equiperdum in Pferdeherden im Zentral
Aimak der Mongolei mittels der Komplementbindungsreaktion (KBR) und des
Enzyme-linked Immunosorbent Assay (ELISA).
de
dc.description.abstract
Sero-epidemiological investigations on the prevalence of Trypanosoma
equiperdum (Doflein, 1901) in horses in Mongolia. The objective of the
investigation was to generate data for the prevalence-estimation of dourine in
horses in the central province (Tuv-aimag) of Mongolia. The field
investigations were carried out from May 2000 until July 2000. At least four
herds of horses were chosen by random selection from each of the 26 central
aimag subdivisions (= total 119 herds). 10 horses per herd, stratified for age
and sex within the herds were sampled and examined (= total 1190 horses). Herd
sizes varied between 10 and 280 animals, the median was 33 animals. In 17.6%
of the herds the condition of the animals was assessed as bad, in 51.3% as
medium and in 31.3% as good. Particularly herds in Mungunmorit, in the
northeast of the central aimag and in Buren, in the southwest of the aimag,
were in very bad condition at the time of examination. The horses were
cachectic and emaciated. According to owner information an increased number of
abortions in these herds was observed. Owners of 54 herds (45.4%) reported
such increased abortions. Furthermore, owners´ reports frequently contained
nasal discharge, cough and infestation of ticks. By individual examination,
the nutritional status of 14.2% of animals was classified as bad, 74.2% as
medium and 11.2% as good. The herd owners held the hard winter 1999/2000
responsible for the high number of animal losses, the bad nutrition of their
herds and the increased occurrences of abortions. From the total of 1190
horses blood samples were taken. All serum samples were examined for
antibodies against T. equiperdum by CFT and by indirect ELISA. From the
eventually 1122 tested serum samples 85 (7.6%) were positive in the CFT and 75
(6.7%) in the ELISA. CFT and ELISA results showed good (96%) diagnostic
agreement. 1017 negative and 55 positive CFT reactors were confirmed by ELISA.
30 positive and 20 negative CFT reactors, however, did not agree with the
ELISA results. These differences may have been due to the use of different
antigen preparations for both tests or by partly different immunoglobulin
isotypes targeted by either test. The majority of herds (65% in CFT, 66.7% in
ELISA) was sero-negative. The CFT revealed one positive reactor in 16 herds
(1/10), two positive reactors in another 16 herds (2/10), three positives in
two herds (3/10), four positives in five herds (4/10) and 5 (5/10) resp. 6
(6/10) positive reactors each in one herd. The ELISA revealed one positive
reactor in 21 herds (1/10), two positive reactors in eight herds (2/10), three
positive reactors in four herds (3/10) and four positives in five herds
(4/10). In one herd six animals reacted positively in the ELISA. One herd in
Mungunmorit soum had the highest number of sero-positive animals (CFT and/or
ELISA), followed by herds in Bayandelger soum and Bajanzagaan soum, Zeel soum
and Argalant soum. Herds with at least three (3/10) sero-positive animals (CFT
and/or ELISA) were examined by PCR using a Trypanozoon-specific primer pair.
From 130 whole blood samples eight samples were positive in the PCR. Five of
the eight PCR-positive animals responded positively in both tests (CFT and
ELISA). Two PCR-positive samples were either positive in CFT or ELISA. One
sample which reacted positively in the PCR was sero-negative (CFT and ELISA).
The clinical examination of the horses identified one stallion with a
oedematous skin plaque and scrotal and preputial oedema. The sample of this
stallion was negative in the CFT but positive in ELISA and PCR. Three mares
with vaginal discharge were sero-positive, but negative in the PCR. Four
horses with skin nodes presumably caused by horse-flies, reacted positively in
all tests. Blood smears were prepared from three animals per herd. The smears
of those horses positive for dourine in CFT and/or ELISA were Giemsa stained
and examined by microscopy. None of these blood smears showed any
trypanosomes. The serological CFT and ELISA results and the detection of
trypanosomal DNA in the PCR confirm the prevalence of trypanosome infections
in some herds of horses in the central aimag of Mongolia. Since at present
neither the two serological tests nor the PCR permit to differentiate between
the two subspecies Trypanosoma equiperdum (causative agent of dourine) and
Trypanosoma evansi (causative agent of surra) a final diagnosis cannot be
made. On the basis of the clinical findings, the negative parasitological
results and the concentration of conspicuous sero-prevalences in single herds,
the existence of infections with the causative agent of dourine are
hypothesized. Longitudinal studies in high prevalence herds aimed at
identification of trypanosome parasites are needed.
en
dc.rights.uri
http://www.fu-berlin.de/sites/refubium/rechtliches/Nutzungsbedingungen
dc.subject
Trypanosoma Equiperdum
dc.subject.ddc
600 Technik, Medizin, angewandte Wissenschaften::630 Landwirtschaft::630 Landwirtschaft und verwandte Bereiche
dc.title
Sero-epidemiologische Untersuchungen zur Prävalenz von Trypanosoma equiperdum
(Doflein, 1901) bei Pferden in der Mongolei
dc.contributor.firstReferee
Univ.-Prof.Dr.E.Schein
dc.contributor.furtherReferee
Univ.-Prof.Dr.A.Grabner
dc.contributor.furtherReferee
Univ.-Prof.Dr.T.Hiepe
dc.date.accepted
2001-11-23
dc.date.embargoEnd
2002-01-17
dc.identifier.urn
urn:nbn:de:kobv:188-2001002270
dc.title.translated
Sero-epidemiological investigations on the prevalence of Trypanosoma
equiperdum (Doflein, 1901) in horses in Mongolia
en
refubium.affiliation
Veterinärmedizin
de
refubium.mycore.fudocsId
FUDISS_thesis_000000000493
refubium.mycore.transfer
http://www.diss.fu-berlin.de/2001/227/
refubium.mycore.derivateId
FUDISS_derivate_000000000493
dcterms.accessRights.dnb
free
dcterms.accessRights.openaire
open access