TABLE 1.

Anti-recombinant CP41 and anti-native C. parvum (nCP) oocyst antigen Ab titers in sera from adult cows after experimental cryptosporidiosis infection or in unexposed control adult cows

Study group and cow no.	Time postinfection (wk)	ELISA titer
		Anti-rCP41	Anti-nCP oocyst antigen
Experimental infections
1	0	1,100	2,560
	1	1,310	NDa
	2	1,200	1,280
	3	1,200	2,560
	4	1,110	2,560
2	0	900	2,560
	1	1,020	ND
	2	1,260	1,280
	3	1,070	2,560
3	0	890	ND
	1	850	1,280
	2	900	2,560
	3	1,200	5,120
Unexposed controls
1		<100	<100
2		<100	320

^aND, not done.