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→Taenia spp of Humans
- In East Africa, high prevalence in human population + lack of sanitation in rural areas = high rate of transmission to cattle = many calves infected = calfhood infection persists, but animals immune to reinfection.
- In East Africa, high prevalence in human population + lack of sanitation in rural areas = high rate of transmission to cattle = many calves infected = calfhood infection persists, but animals immune to reinfection.
T. solium, the Pork Tapeworm of Humans
=== ''T. solium'', the Pork Tapeworm of Humans ===
The adult tapeworm, which occurs in the human small intestine, has hooks on the scolex. The life-cycle is similar to that of T. saginata, except that the pig is the intermediate host. Heavy infections in pigs may be detected in vivo by inspecting the tongue for cysticerci. T. solium is particularly prevalent in communities where pigs are allowed to scavenge freely around human habitation. This species is particularly dangerous as the cysticerci (known as ‘measles’), which normally occur in the pig, can also develop in human tissues (brain and musculature). This may happen by swallowing eggs from the environment or, in people carrying a tapeworm, as a result of eggs being brought forward in the alimentary tract by retro-peristalsis.
The adult tapeworm, which occurs in the human small intestine, has hooks on the scolex. The life-cycle is similar to that of T. saginata, except that the pig is the intermediate host. Heavy infections in pigs may be detected in vivo by inspecting the tongue for cysticerci. T. solium is particularly prevalent in communities where pigs are allowed to scavenge freely around human habitation. This species is particularly dangerous as the cysticerci (known as ‘measles’), which normally occur in the pig, can also develop in human tissues (brain and musculature). This may happen by swallowing eggs from the environment or, in people carrying a tapeworm, as a result of eggs being brought forward in the alimentary tract by retro-peristalsis.
It is important to differentiate the gravid proglottids of Taenia from those of Dipylidium. Taenia segments: - are rectangular
== Taenia spp of the Dog ==
*Several species occur in dogs, varying in length from approximately 0.5-5m.
*Some species may also occur in the fox.
*The adults live in the small intestine and appear to cause little harm, but the exiting proglottids may cause pruritis.
*The prevalence of each species varies in different groups of dogs depending on their diet, that is, whether or not they have access to fresh meat, offal or rabbits.
*The prepatent period is generally 6-8weeks.
*It is important to differentiate the gravid proglottids of Taenia from those of Dipylidium. Taenia segments:
**are rectangular
**there is only one lateral genital pore
**the eggs are single (i.e. not in packets like Dipylidium)
T. ovis
T. ovis