I - organism

- I belli - I buetschlii - influenza - influenza A H10N8 virus - influenza A H1N1 virus - influenza A H3N2 virus - influenza A H5N1 virus - influenza A H5N2 virus - influenza A H5N8 virus - influenza A H6N1 virus - influenza A H7N9 virus - influenza A virus - influenza B virus - influenza C virus - Influenza type b - influenza virus - intestinal bacteria (flora) - Intestinal bacterium - intestinal worms - Iodamoeba buetschlii - iridoviridae - Isospora belli - itch mite - Ixodes scapularis - Ixodidae (hard ticks)