Control of Taenia saginataby post-mortem examination of carcasses.

Wanzala W, Onyango-Abuje J.A., Kang’ethe E.K. , K. H, Zessin, N. M,Kyule,Baumann, Ochanda H , Harrison L.J.S.
Division of Parasitology and Immunology, Department of Zoology, University of Nairobi, P.O. Box 30197,
Nairobi, Kenya
National Veterinary Research Centre, Muguga, P.O. Box 32, Kikuyu, Kenya
Department of Public Health, Pharmacology & Toxicology, University of Nairobi, P.O. Box 29053, Nairobi, Kenya
Department of International Animal Health, Freie University Berlin, FB Veterinärmedizin, Luisenstraße 56, D-10117 Berlin, Germany.
Centre for Tropical Veterinary Medicine, University of Edinburgh, Easter Bush, Roslin Midlothian, EH25 9RG,
Scotland, U.K.

ABSTRACT
Background: A study to curb transmission cycle of a zoonotic Taeniacestodiasis between humans and
cattle is presented.

Objective: To evaluate the reliability of meat inspection procedure in detecting carcasses of cattle with T.
saginatacysticercosis.

Methods: A total of 55 cattle divided into two groups of artificially (n =30) and naturally (n = 25) infested
animals were utilized. Total dissection method was used as a gold standard of validity.

Results: Meat inspection insensitively revealed cysticerci in 12 carcasses in each group compared with 24
and 23 carcasses revealed by total dissection in natural and artificial infestations, respectively. Sites of
oncosphere invasion showed great variations with the two groups of cattle. In the predilection sites, most
cysticerci were found in the heart, Triceps brachii, tongue and head muscles in that order.

However, nonpredilection sites (neck and back, hind limbs, chest, pelvic and lumbar regions, lungs and liver) considerably harboured high numbers of cysticerci. Observations indicated that except for the dead, degenerate
or calcified cysticerci a careless meat inspector will most likely miss out quite a number of viable cysticerci,
which blend the pinkish-red colour of the meat and be passed on for human consumption, becoming the
source of bovine cysticercosis.

Conclusions: The results confirmed that in spite of the time and efforts taken by meat inspectors looking
for cysticerci at specified predilection sites of carcasses, this method is insensitive and inaccurate. To
effectively improve meat inspection procedures, there is need to increase the area and number of predilection sites observed during inspection and vary them according to the nature of the animals, their husbandry history and the target human population for consumption. In addition, other control approaches such as vaccination, chemotherapy and immunodiagnosis should be developed and implemented to complement meat inspection procedures.

Key words:meat inspection; post-mortem; zoonosis; bovine cysticercosis; taenia saginata.

African Health Sciences 2003 3(2): 68 – 76