Table 3.

Results of Pig Necropsy According to Serologic Status at Each Phase of the Cysticercosis Elimination Demonstration Program.^*

Phase and Serologic Status	Pig Blood Sample	Pig Necropsy Sample	Pigs with Live Nondegenerated Larval Cysts†
	number	number (percentage)
Phase 1‡
Seronegative	197	146 (74.1)	2 (1.4)
1–2 bands	186	128 (68.8)	4 (3.1)
3 bands	73	47 (64.4)	10 (21.3)
4–7 bands	8	5 (62.5)	2 (40.0)
Total	464	326 (70.3)	18 (5.5)
Phase 2, immediately after intervention
Seronegative	3024	178 (5.9)	1 (0.6)
1–2 bands	556	184 (33.1)	0
3 bands	414	279 (67.4)	4 (1.4)
4–7 bands	25	17 (68.0)	1 (5.9)
Total	4019	658 (16.4)	6 (0.9)
Phase 2, 12 months after intervention
Seronegative	2362	37 (1.6)	0
1–2 bands	505	143 (28.3)	2 (1.4)
3 bands	186	114 (61.3)	3 (2.6)
4–7 bands	20	16 (80.0)	2 (12.5)
Total	3073	310 (10.1)	7 (2.3)
Phase 3, immediately after intervention
Seronegative	2532	—	—
1–2 bands	565	53 (9.4)	0
3 bands	365	235 (64.4)	1 (0.4)
4–7 bands	68	54 (79.4)	2 (3.7)
Total	3530	342 (9.7)	3 (0.9)

^*Pig serum samples were assessed by enzyme-linked immunoelectrotransfer blot assay, which uses lentil lectin-bound glycoproteins. Serologic status was based on the number of reactive bands on Western blot analysis.

^†Necropsy samples of pig muscle or brain tissue were examined for live, nondegenerated cysts filled with clear fluid. Necropsy samples covered most seropositive pigs to maximize the likelihood of detecting infections. Formal viability testing and histopathological analysis were performed in phase 2 only.

^‡Phase 1 necropsy was performed during a culling intervention in which the majority of pigs were removed from six geographically isolated villages in which no chemotherapy or vaccine had been applied previously.