The safety and high immunity of OP vaccine has keen proven at labc’ratory exrerimenis during psst3 years. Forfurtherunderstanding, asmallsca]eoffie]dtst was tat Pingtung Hsien In 1972.The result axe summari as follows:
1,Amor*g 10,(XX) pigs in atlwithGPvaccinefrl head showftl reaction (0.64%) and 35 died (0.33%). 8811 pigs vaccinaed with the 1apini4 vaccine were ctrnpax&. as tntrol groug 38 head showed reaction (0.44%) and 34 died (0.4 %).Dead Cases were found in bath groups during 2 weeks of olrservation reriod.Such cases,aftr careful examination,were not caused by vaccination,but by mc6tly e-Jema disease and toxoplasmceis.Thus,the safety of OP vaccine was proved in the field test.
2.In OP vaccine gioug329 head were chosen at random to ched their neutahtion antibcdy t before and one month aft vaccination,The pigs with a parental *r below it 16 cxuld prcduce high immunity aft vaccination.But the pr-cduction of antilyxly was inflcaI or even stopjtl in part of those pigs with abcrne x32 tier. The same phenornenum had been found in the 1apini1 vaccine group.
3.32 pigs of OP vaccination group were purchased one month rc€incc,iation and challenged with virulent AU) strain at the Provincial Research Institue for Animal HealthAnyonewithatierofx 1 ora&veocn,ldshownoreactionofsurviveaft the change, From the result obtainei,the OP vaccine was also found with high safety and immunity to the pigs raised in Taiwan,