| Cervical |
| Conjunctival |
| In utero |
| Intraarterial |
| Intracarotid (i.c.) |
| Intracerebral |
| Intracranial |
| Intradermal |
| Intragastral / Intracolonic |
| Intralymphatic |
| Intra amniotic |
| Intramuscular |
| Intranasal |
| Intraoccular |
| Intraperitoneal (i.p.) |
| Intraplacental |
| Intrarectal |
| Intrasplenic |
| Intratracheal |
| Intravenous (i.v.) |
| Percutaneous/Skin patch |
| Scarification |
| Subcutaneous (s.c.) |
| Target lymph node immunization |
| Transcutaneous |
| Intraepidermal (i.d.) |
| Oral |
| Other |
| Urethral |
| Vaginal |