TABLE 2 .

Anti-pneumococcal immunity significantly reduces transmission

Index conditiona	Contact conditiona	No. of contacts		% of infected contact mice (P valueb)
		Infected	Noninfected
Non-immune	Non-immune	9	22	29c
Immune	Immune	0	16	0 (0.019)
Vaccinated	Vaccinated	0	14	0 (0.039)
Immune	Non-immune	0	13	0 (0.041)
Non-immune	Immune	0	12	0 (0.044)

^a“Immune” refers to mothers immunized by colonization and “Vaccinated” refers to mothers immunized by PCV administration.

^bCompared to non-immune contact mice with non-immune index mice condition (Fisher's exact test).

^cSee reference 12.