FIG. 5.

Percentages of sows and finishers with positive results in ELISA at various intervals after the outbreak of FMD in Taiwan. A total of 10, 15, 179, and 174 pig farms were surveyed for sows 2 (solid bars), 2.5 (shaded bars), 3 (hatched bars), and 3.5 (open bars) years postoutbreak, respectively. Ten sera each from sows at parities 1 to 2, 3 to 4, and ≧5 were randomly collected from each pig farm. A total of 9, 15, 199, and 188 farms were surveyed for finishers 2, 2.5, 3, and 3.5 years postoutbreak, respectively. Thirty finishers were randomly selected from each pig farm for bleeding, except for 2.5 years postoutbreak, when only 10 pigs per farm were tested.