Table 3.

Summary of chicken colonization phenotypes of ppk1 and ppk2 mutants

Study	Organ/feces	Inoculation dose (CFU/chick)	Wildtype (CFU/g)	ppk1 mutant (No. of chicks colonized)	ppk2 mutant (No. of chicks colonized)
Candon et al[24] 2007	Ceca	1.5 × 105	1.8 × 108	0/10 chicks	NS
		1.5 × 106	1.8 × 108	8/10 chicks	NS
		1.5 × 107	1.8 × 108	10/10 chicks at an average of 1.8 × 108 CFU/g	NS
Gangaiah et al[25] 2009 and 2010	Ceca	1.0 × 103	1.0 × 106	0/5 chicks	0/5 chicks
		1.0 × 104	1.0 × 108	0/5 chicks	0/5 chicks
		1.0 × 105	8.0 × 108	5/5 chicks at an average of 2.0 × 104 CFU/g	5/5 chicks at an average of 9.0 × 103 CFU/g
	Bursa	1.0 × 103	1.0 × 104	0/5 chicks	0/5 chicks
		1.0 × 104	1.0 × 105	0/5 chicks	0/5 chicks
		1.0 × 105	1.5 × 105	5/5 chicks at an average of 1.0 × 102 CFU/g	5/5 chicks at an average of 8.0 × 102 CFU/g
	Feces	1.0 × 103	1.0 × 105	0/5 chicks	0/5 chicks
		1.0 × 104	1.0 × 107	0/5 chicks	0/5 chicks
		1.0 × 105	3.0 × 107	5/5 chicks at an average of 1.5 × 103 CFU/g	5/5 chicks at an average of 8.0 × 103 CFU/g

NS: Not studied.