Impact of porcine reproductive and respiratory syndrome virus and porcine circovirus-2 infection on the potency of the classical swine fever vaccine (LOM strain).
The classical swine fever (CSF) vaccine, which is derived from the LOM strain of the CSF virus (CSFV), induces protective immunity against CSFV infection. However, several factors influence vaccine efficacy. Evidence suggests that infection by porcine reproductive and respiratory syndrome virus (PRRSV) and/or porcine circovirus 2 (PCV2) reduces the efficacy of several vaccines. Here, we examined the effect of PRRSV or PCV2 alone or co-infection by PRRSV/PCV2 on the potency of the LOM vaccine in pigs. Neither CSFV antibody levels nor the period during which CSFV antigens were detectable in LOM-vaccinated pigs were negatively affected by infection by PRRSV or PCV2. However, co-infection with PRRSV/PCV2 may affect the replication or activity of the CSF vaccine virus in pigs vaccinated with the LOM strain, although CSFV antibody levels were not negatively affected. Nevertheless, the LOM vaccine afforded complete protection against a virulent strain of CSFV.
Animal and Plant Quarantine Agency, Gimcheon, Gyeongbuk, 39660, Republic of Korea.
Seong-In
SI
Lim
Animal and Plant Quarantine Agency, Gimcheon, Gyeongbuk, 39660, Republic of Korea.
Hye-Young
HY
Jeoung
Animal and Plant Quarantine Agency, Gimcheon, Gyeongbuk, 39660, Republic of Korea.
Byounghan
B
Kim
Animal and Plant Quarantine Agency, Gimcheon, Gyeongbuk, 39660, Republic of Korea.
Jae-Young
JY
Song
Animal and Plant Quarantine Agency, Gimcheon, Gyeongbuk, 39660, Republic of Korea.
Jaejo
J
Kim
Animal and Plant Quarantine Agency, Gimcheon, Gyeongbuk, 39660, Republic of Korea.
Ha-Young
HY
Kim
Animal and Plant Quarantine Agency, Gimcheon, Gyeongbuk, 39660, Republic of Korea.
In-Soo
IS
Cho
Department of Clinical Laboratory Science, Semyung University, Semyung-ro 65, Jecheon, Chungbuk 390-711, South Korea.
Gye-Hyeong
GH
Woo
College of Veterinary Medicine, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul, 143-701, Republic of Korea.
Joong-Bok
JB
Lee
Animal and Plant Quarantine Agency, Gimcheon, Gyeongbuk, 39660, Republic of Korea. Electronic address: andj67@korea.kr.
Dong-Jun
DJ
An
D000818:Animals; D000914:Antibodies, Viral / Q000097:blood; D018173:Circoviridae Infections / Q000276:immunology / Q000662:veterinary*; D017925:Circovirus / Q000276:immunology; D006691:Classical Swine Fever / Q000276:immunology / Q000517:prevention & control*; D006692:Classical Swine Fever Virus / Q000276:immunology*; D060085:Coinfection; D019318:Porcine Reproductive and Respiratory Syndrome / Q000276:immunology*; D019316:Porcine respiratory and reproductive syndrome virus / Q000276:immunology*; D013552:Swine; D014611:Vaccination; D014765:Viral Vaccines / Q000276:immunology* / Q000592:standards; D014779:Virus Replication
D000914:Antibodies, Viral; D014765:Viral Vaccines
Classical swine fever virus; LOM strain; PCV2; PRRSV