SOME IMPORTANT PARASITIC INFECTIONS IN BOVINES CONSIDERED FROM ECONOMIC AND SOCIAL (ZOONOSIS) POINTS OF VIEW - PARASITOLOGICAL SYMPOSIUM, LYON (F), OCTOBER 24-26, 1983.
Parasitic diseases of animals have a tremendous economic importance since the economic incidence of these diseases is associated with latent, subclinical morbidity, which is very often overlooked. On the other hand, quite a lot of parasites are transmissible from animals to Man and may induce in Man parasitic zoonoses, some of which are very serious. The themes which were dealt with in the C.E.C. Lyon Symposium were selected according to these two preoccupations. 1) Bovine babesiosis, known in Europe for quite a long time, is seldom lethal but is always associated with a reduction of the profit from cattle breeding. Babesiosis in animals is also a model for the study of human Malaria, mainly concerning vaccination. Some cases of human babesiosis are known in Europe: this leads to a very precise, careful study of the biology of the parasite and of the epidemiology and diagnosis of the infection in cattle. 2) The importance of animal sarcosporidiosis has been emphasized for some years. Man may be a definitive host: he suffers from enteritic disorders after eating infected pork or beef. Pig and cattle are sometimes very seriously infected by eating a food spoiled by human or dog, cat, or other carnivorous animals feces. In the Lyon Symposium these data were presented with others, concerning acquired immunity against acute sarcosporidiosis in pig and cattle. 3) Two metacestodoses are very important in animals : Hydatidosis (hydatid cyst) and muscular cysticercosis (measles in pig and bovines). a) Hydatidosis involves dogs and other canidae which harbour adult parasite Echinococcus granulosus and sheep, cattle, horse, pig which are infected by the metacestode. Man may be infected by the metacestode. This complex has a tremendous importance, the more so since it has a zoonotic incidence, but we still do not know every aspect of how it works. The incidence of echinococcosis/hydatidosis was emphasized in Lyon together with data about the taxonomy of the parasite, the epidemiology of hydatidosis and the control of the complex. b) Taeniasis (Taenia saginata, Taenia solium, both in man)/Cysticercosis (measles in cattle + Cystericercus bovis + and in pig + Cystericercus cellulosae) has also a zoonotic importance which implies condemnation of cysticercosis infected meat as a source of taeniasis infection in man. In Europe, chiefly in the European Community only the complex T. saginata (man)/C. bovis <(cattle) is found but we still are unable to control the parasitic complex properly. This failure chiefly comes from our inability both to diagnose measles in cattle (either living or in carcasses) and to dispose of sewage which contains oncospheres from infected feces of Man. These important problems were discussed in Lyon together with passive and active immunization of cattle against cysticercosis. 4) Finally two points were considered even though they do not look, at first, very crucial. They are: a) Bovine parafilariasis, which is taken very seriously by Swedish farmers and veterinarians. b) Cattle onchocerciasis, which has recently been observed in Belgium.
Bibliographic Reference: EUR 8900 EN-FR (1984) FS, 258 P., BFR 800, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989123110100 / Last updated on: 1987-01-01
Available languages: en,fr