Attempts to immunize chickens against Cryptosporidium baileyi with C. parvum oocysts and Paracox™ vaccine

Title:

Attempts to immunize chickens against Cryptosporidium baileyi with C. parvum oocysts and Paracox™ vaccine

Creator:

Sréter, Tamás, Hornok, Sándor, Varga, István, Békési, László, and Széll, Zoltán

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:3b6dd0cd-f7f6-4e4f-8449-f760a4a1dc61
uuid:3b6dd0cd-f7f6-4e4f-8449-f760a4a1dc61
urnnbn:urn:nbn:cz:aba007-000dmw

Subject:

immunization, chicken, Cryptosporidium baileyi, C. parvum, Eimeria spp., Paracox, and cross-immunity

Type:

model:internalpart and TEXT

Format:

print

Description:

To study the possibility of immunization against Cryptosporidium baileyi Current, Upton et Haynes, 1986 with the attenuated anticoccidial vaccine, Paracox™ and oocysts of C. parvum Tyzzer, 1912, chickens were inoculated orally with either 3 x 10’ vaccine oocysts or 8 x I O5 C, baileyi or C. parvum oocysts at 1 week of age. The inoculation with Paracox™ vaccine and C. parvum oocysts was repeated at 2 and 3 weeks of age. Uninfected birds served as controls. All animals with the exception of one uninfected group were challenged orally with either 8 x 105 C. baileyi or 3 x 10s Eimeria tenella Railliet et Lucet, 1891 oocysts at 4 weeks of age. Sera were collected at 4 weeks of age, and were examined by ELISA using C. baileyi antigens. Birds inoculated with C. parvum oocysts did not shed C. parvum oocysts in their faeces, but anticryptosporidial antibodies could be detected in the sera. The total oocyst output of C. parvum inoculated chickens was 17% of that of previously uninfected birds after the oral challenge with C. baileyi. Considering that antibodies play no or only a minor role in resistance to C. baileyi, these results suggest that inoculation of chickens with C. parvum oocysts stimulated also cellular immune response. Based on the relative body weight gain, faecal scores, oocyst output, mortality, and caecal lesions in the birds immunized with Paracox™ vaccine and challenged with E. tenella, the vaccination induced only a moderate protection against the reinfection. The results of crossimmunization of chickens with Eimeria spp. and C. baileyi suggest that attenuated anti-eimerian vaccines do not induce any protection against cryptosporidial infection.

Language:

English

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

77-80 and 79-82

Source:

Folia parasitologica | 1997 Volume:44 | Number:1

Harvested from:

CDK

Metadata only:

false