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Composition of the nasopharyngeal and oral microbiota. CFU of total bacteria (A), streptococci (B), lactobacilli (C), and staphylococci (D) recovered 3 weeks after the last immunization from nasal wash (empty bars) and saliva (solid bars) samples are shown. *, value statistically different from that of control mice inoculated with saline (Student's t test).
