Table 1.

Clinical activity score.

Activity Score	Symptoms
0 (animals to euthanize)	Immobility, bradypnea, swollen stomach, wet tail and legs, squinted eyes, bristled hair, areflexia, weight loss >20%
1	Motor retardation, trembling, swollen stomach, tachypnea, bristled hair, reaction to external stimuli, wet tail, isolation, weight loss >10% and <20%
2	Normal activity