TABLE 1.

Physiopathological analysis of groups I to IV by 1 month post-FrCas^E infection

Group	28 days after birth			% Survival 35 days after birth
	Symptoms	Viremiaa (FFu/ml)	Splenocyte infectionc (%)
I	None	NDb	0.8 ± 0.4	100
II	None	ND	0.5 ± 0.3	100
III	None	8 × 102 ± 1.5	13.2 ± 7.4	100
IV	Ataxia, paralysis	1.3 × 106 ± 0.2	44 ± 2.6	0

^aAssayed by FIA from eight animals.

^bND, not detectable. The limit of detection was 10² FFU/ml.

^cFlow cytometry assay of FrCas^E Env-expressing spleen cells.