microbiology 243 human 194 Humans 187 Article 90 female 89 male 86 Female 84 Male 79 nonhuman 73 controlled study 71 adult 61 genetics 59 isolation and purification 57 metabolism 56 drug effect 49 Adult 46 middle aged 46 procedures 46 Middle Aged 44 Animals 43 Bacteria 42 animal 42 chemistry 42 aged 31 Aged 29 antiinfective agent 29 Saliva 28 saliva 28 Biofilms 27 biofilm 27