Castration and pregnancy of rural pigs significantly increase the prevalence of naturally acquired Taenia solium cysticercosis.
Cuentepec is a rural village of central Mexico, where 1300 pigs were bred at the time of the study in conditions that favor Taenia solium transmission. The tongues of 1087 (84%) of these pigs were visually examined and 33% were found to be cysticercotic. Castration of male pigs increased prevalence from 23 to 50% (P < 0.001) and pregnancy in sows also increased their prevalence from 28 to 59% (P < 0.001). Thus, endocrinological conditions characterized by low levels of androgens or high levels of female hormones probably influence the susceptibility of pigs to T. solium cysticercosis as observed in mice infected with Taenia crassiceps. Delaying castration of male pigs and confinement of sows during pregnancy might significantly decrease the prevalence of pig-cysticercosis and help curb transmission without much cost or difficulty.
Universidad Autónoma del Estado de Morelos, Morelos, Cuernavaca, Mexico.
J
J
Morales
T
T
Velasco
V
V
Tovar
G
G
Fragoso
A
A
Fleury
C
C
Beltrán
N
N
Villalobos
A
A
Aluja
L F
LF
Rodarte
E
E
Sciutto
C
C
Larralde
D000822:Animal Husbandry / Q000379:methods*; D000818:Animals; D002369:Castration / Q000009:adverse effects / Q000662:veterinary*; D003551:Cysticercosis / Q000453:epidemiology / Q000469:parasitology / Q000635:transmission / Q000662:veterinary*; D004198:Disease Susceptibility / Q000662:veterinary; D018562:Disease Transmission, Infectious / Q000517:prevention & control / Q000662:veterinary; D005260:Female; D006920:Hygiene; D008297:Male; D008800:Mexico; D011247:Pregnancy; D015597:Pregnancy Complications, Parasitic / Q000453:epidemiology / Q000662:veterinary*; D015995:Prevalence; D012307:Risk Factors; D012424:Rural Population; D013552:Swine; D013553:Swine Diseases / Q000453:epidemiology* / Q000469:parasitology / Q000635:transmission; D041201:Taenia solium; D014059:Tongue / Q000469:parasitology