A SEROLOGICAL STUDY ON INFECTION PATTERNS, CONTROL AND PERSISTENCE OF CLASSICAL SWINE FEVER IN INFECTED FARMS IN THE PHILIPPINES

被引:2
作者
GEERTS, P [1 ]
PENSAERT, M [1 ]
SANCHEZ, R [1 ]
机构
[1] UNIV PHILIPPINES,COLL VET MED,LAGUNA 4031,PHILIPPINES
关键词
CLASSICAL SWINE FEVER; ENZOOTIC INFECTION; SEROLOGY; VACCINATION;
D O I
10.1292/jvms.57.917
中图分类号
S85 [动物医学(兽医学)];
学科分类号
0906 ;
摘要
In 3 farrow-to-finish farms with enzootic classical swine fever (CSF) all sick pigs were culled and an intensive vaccination programme was introduced. Boars and sows were vaccinated every 6 months and piglets at the age of 6 and 8 weeks. The infection was monitored on clinical grounds and by means of serological examination of the farms. Serological results reflected well the clinical situation in the farms. High titers and a high percentage of animals with positive titers were observed in infected farms, compared to lower titers in a clinically ''free'' farm, which were interpreted as titers due to vaccination. Although clinical improvement was noticed, the rigid vaccination regime was not able to control CSF in none of the farms. In all cases, a small percentage of pigs in the finishing stage was still affected. Since these pigs seemed not to have responded to vaccination at 6 and 8 weeks of age, the programme was questioned. Additionally, very high titers were recorded in sows from infected farms, which would automatically extend the period of passive protection in offspring and postpone the age at which piglets could be vaccinated. More intensive programmes, which include also vaccination beyond the age of 8 weeks, were suggested to bring enzootic infections under control.
引用
收藏
页码:917 / 920
页数:4
相关论文
共 9 条
[1]   INHIBITION OF VIRUS-REPLICATION IN THE TONSILS OF PIGS PREVIOUSLY VACCINATED WITH A CHINESE STRAIN VACCINE AND CHALLENGED ORONASALLY WITH A VIRULENT-STRAIN OF CLASSICAL SWINE FEVER VIRUS [J].
BIRONT, P ;
LEUNEN, J ;
VANDEPUTTE, J .
VETERINARY MICROBIOLOGY, 1987, 14 (02) :105-113
[2]  
JENSEN MH, 1981, ACTA VET SCAND, V22, P85
[3]   HOG-CHOLERA VIRUS - ACTIVE IMMUNIZATION OF PIGLETS WITH THIVERVAL STRAIN IN PRESENCE AND ABSENCE OF COLOSTRAL PASSIVE-IMMUNITY [J].
LAUNAIS, M ;
AYNAUD, JM ;
CORTHIER, G .
VETERINARY MICROBIOLOGY, 1978, 3 (01) :31-43
[4]  
LIESS B, 1976, DIAGNOSIS EPIZOOTIOL, P187
[5]  
MOENNIG V, 1990, DEUT TIERARZTL WOCH, V97, P91
[6]  
OGAWA T, 1984, 8TH P IPVS GHENT, V2, P67
[7]   INFLUENCE OF THE VACCINATION REGIME ON THE HERD IMMUNE-RESPONSE FOR SWINE FEVER [J].
TERPSTRA, C ;
WENSVOORT, G .
VETERINARY MICROBIOLOGY, 1987, 13 (02) :143-151
[8]   THE PROTECTIVE VALUE OF VACCINE-INDUCED NEUTRALIZING ANTIBODY-TITERS IN SWINE FEVER [J].
TERPSTRA, C ;
WENSVOORT, G .
VETERINARY MICROBIOLOGY, 1988, 16 (02) :123-128
[9]  
TERPSTRA C, 1976, ZBL VET MED B, V23, P809