Humans human 217 microbiology 182 female 87 male 83 Female 82 Male 77 Article 73 adult 64 controlled study 58 genetics 56 isolation and purification 50 Adult 49 nonhuman 49 middle aged 46 Middle Aged 45 drug effect 44 procedures 44 metabolism 40 aged 34 antiinfective agent 33 Aged 32 saliva 31 Anti-Bacterial Agents 28 Saliva 28 chemistry 27 Young Adult 26 young adult 26 Adolescent 24 adolescent 24