Table I.

Tissue sampling schedule

Sham animal	Vaccine animal	Blood	Jejunum	Inguinal LN	Mesenteric LN
4939	4750	P, 0, 7	P, 0, 7	P, 0, 7	P, 7
4975	4736	P, 0, 7, 10	P, 7, 10	P, 7, 10	P, 10
4875	4942	P, 0, 7, 10, 14	P, 10, 14	P, 10, 14	P, 14
4931	4974	P, 0, 7, 10, 14, 17	P, 14, 17	P, 14, 17	P, 17
5510	4844	P, 0, 7–14, 17, 21	P, 17, 21	P, 17, 21	P, 21
4755	4934	P, 0, 7–14, 17, 21, 28	P, 21, 28	P, 21, 28	P, 28

Listed are the days after infection (P = 1 mo before infection) at which samples were collected from each animal in the group. For four animals, 1 mL blood was collected daily between days 7 and 14 after infection. All other collections were 5 mL blood. The last collection date was a necropsy. All animals sustained only a single survival surgery.