Studies on the epizootiology of canine cestodes particularly Taenia multiceps and ovine coenurosis.
In a survey of 552 sheep flocks in Dyfed, Wales, carried
out in 1973, coenurosis occurred in 375 (68%) with an
estimated average annual flock incidence of between 2.5
and 3.0%. Evidence of infection with the larval stage of
Taenia multiceps was found in 58/1000 (5.8%) lambs sent
for slaughter. Taenia multiceps was recovered from 37/320
(11.5%) dogs on 20/100 sheep breeding farms, 3/39 (7.7%)
dogs on 2/18 sheep wintering farms and 41/552 (7.4%)
hounds in 4/12 packs. The frequency of cestode infection
in farm dogs and hounds was closely associated with the
feeding of uncooked meat and offal and the absence of
regular anthelmintic treatment. Only one (0.6%) of 166
pet dogs and one (0.26%) of 387 foxes examined harboured
Taenia multiceps and neither were considered to be of
importance in the epizootiology of Taenia multiceps.
Dogs were experimentally infected with Taenia multiceps
and remained infected for up to periods of six months or
longer, and up to 21 proglottids were shed each day.
Rabbits and mice could not be experimentally infected with
oncospheres of Taenia multiceps, but lambs which were
experimentally infected with the oncospheres developed
acute or chronic coenurosis.
suspensions of on co spheres in distilled water remained
viable at 3 - 11°C for periods up to eight weeks, but the
coenurus was viable for no longer than four days in the
intact skull at 9 - 11°C.
The pathogenesis of acute and chronic coenurosis, wi th
particular reference to the clinical signs, clinical
pathology, pathology and immunology, was studied in
experimentally infected lambs and selected field cases of