| Bakterien | Viren | Pilze | Parasiten |
| L | |||
| Lactobacillus Spp. (+) | Lassa-Virus | Leishmania Spp. | |
| Leclercia adecarboxylata (-) | Lyssa-Virus | Leptomyxid Spp. | |
| Legionella Spp. (-) | Loa loa | ||
| Leptospira Spp. (-) | Läuse (Anoplurida) | ||
| Leuconostoc Spp. (+) | |||
| Listeria monocytogenes (+) | |||