The objective of the study was to verify the sensibility of buffaloes to the poison of
Cro-
talus durissus terri icus
and to study the clinical-pathological picture in buffaloes in com-
parison with the one in cattle. The subcutaneous inoculation of the lio ilized poison of the
snake, diluted in 1ml of physiologic solution, was done in the area of the humerus-radio-
-ulnar joint of three buffaloes at doses of 0.015, 0.03 and 0.066mg/kg, and of two cattle at
doses of 0.03 and 0.066mg/kg. The buffalo that received the 0.03mg/kg dose presented
severe clinical signs but recovered six days later. The bovine that received the same dose,
died after a clinical course of 22h56min. The 0.066mg/kg dose caused death of the bovine
as also the buffalo, with a clinical course of 4h23min and 8h12min, respectively. The bu-
ffalo that received the 0.015mg/kg dose recovered, after a course of 48 hours. The buffalo
that died, showed clinical signs from 3h58min on, and the buffaloes that showed symp-
toms from 17h25min and 24h00min after inoculation of the venom, but recovered. In the
two cattle that died (with doses of 0.03 and 0.066mg/kg), the irst clinical signs occurred
6h10min and 6h31min after the inoculation of the venom. The inoculation produced in
the buffaloes and cattle nervous symptoms of laccid paralysis. The main signs observed
in the buffaloes as well as the cattle, were slight volume increase at the site of inoculation,
respiration dif iculties characterized by predominantly abdominal breathing, apathy, sia-
lorreia, dif iculty to get up when stimulated, evolution to sternal decubitus followed by
lateral decubitus with peddling movements of the legs, and decrease of the re lexes related
to the cranial nerves. The buffaloes showed also augmentation of the sustentation base,
dragging of the hooves of the hind legs, slow and staggering gait, dif iculty in apprehension
of the food, The cattle showed additionally paralysis of the eyeballs, revealed through non-
-exhibition of the sclera during head rotation in latero-caudal direction. Laboratory exams
revealed in the cattle and the buffaloes leucocytosis by neutro ilia, and in the biochemis-
try series, increase in the levels of alanine aminotransferase, aspartato aminotransferase,
creatinaquinase and lactic dehydrogenase. There was no alteration in the urinalysis nor in the activation time of protrombine and in the time of partially activated tromboplastin.
Necropsy only evidenced slight edema corresponding to the inoculation site in one bovine.
Histopathological examination revealed picnosis of the epitelial cell nuclei of some kidney
tubules in the cortex (in the buffalo and in one bovine) and slight vacuolation of hepatocites
(in one bovine).
|
