Skip to main content
Fig. 1 | BMC Veterinary Research

Fig. 1

From: Immunogenicity study of a Streptococcus suis autogenous vaccine in preparturient sows and evaluation of passive maternal immunity in piglets

Fig. 1

Experimental design of the field study. Experiment 1: (A) Sows received 2 doses of the autogenous vaccine intramuscularly at 7 and 3 weeks before farrowing. Blood samples were collected from all enrolled sows just prior to vaccination at 7 weeks before farrowing, at 5 weeks before farrowing (2 weeks after the 1st vaccination) and at 1 week before farrowing (2 weeks after the 2nd vaccination). (B) Randomly selected piglets from vaccinated sows were tagged, then sampled at 7 and 18 days of age. Experiment 2: (A) Gilts received 3 doses of the autogenous vaccine intramuscularly: during quarantine (at the indicated time points) and after quarantine (3 weeks before farrowing). Blood samples were collected from all enrolled gilts prior to vaccination and after each vaccine dose as indicated. (B) Randomly selected piglets from vaccinated and non-vaccinated gilts were tagged, then sampled at 7 and 18 days of age. Experiment 3: Previous gilts from experiment 2 received a single boost-dose (4th dose) of the autogenous vaccine intramuscularly at their 3rd or 4th parity according to their reproductive performance (3 weeks before farrowing). Blood samples were collected prior to vaccination and at 1 week before farrowing

Back to article page