Table 1.
Bibliographic search strategy to identify studies examining the effect of vaccines against colibacillosis in broiler chickens.
Fig 1.
Methodological PRISMA (Preferred Reporting Items for Systematic Review and Meta-analysis) flowchart for the selection of studies.
Fig 2.
E. coli vaccine types, vaccination routes and challenge routes used to assess vaccination efficacy in broilers.
“n" refers to number of studies.
Table 2.
Important characteristics of killed vaccines against colibacillosis in broiler chickens.
Table 3.
Important characteristics of subunit vaccines against colibacillosis in broiler chickens.
Table 4.
Important characteristics of outer membrane vesicles/protein-based vaccines against colibacillosis in broiler chickens.
Table 5.
Important characteristics of live and live attenuated vaccines against colibacillosis in broiler chickens.
Table 6.
Important characteristics of CpG-ODN vaccines against colibacillosis in broiler chickens.
Table 7.
Important characteristics of field studies vaccination against colibacillosis in broiler chickens.
Fig 3.
Risk of Bias (RoB) in the E. coli vaccination studies that reported mortality (A) or feed conversion ratio (B) as one of the assessment parameters.
Fig 4.
Forest plot of live attenuated vaccine efficacy considering the “mortality” assessment parameter.
Fig 5.
Forest plot of CpG oligodeoxynucleotides (CpG-ODN) vaccine efficacy considering the “mortality” assessment parameter.
Fig 6.
Funnel plot of live attenuated vaccine efficacy considering the “mortality” assessment parameter.