- Plasmodium
- Pneumonia, Bacterial and Viral
- Poliomyelitis and Polio
- Polymerase Chain Reaction (PCR)
- Porins
- Prions
- Probiotics
- Prokaryotae
- Prokaryotic Membrane Transport
- Protein Crystallography
- Protein Export
- Protein Synthesis
- Proteins and Enzymes
- Proteomics
- Protists
- Protoplasts and Spheroplasts
- Protozoa
- Prusiner, Stanley (1942- )
- Pseudomembranous Colitis
- Pseudomonas
- Psychrophilic Bacteria
- Public Health, Current Issues
- Pyrex: Construction, Property, and Uses in Microbiology
- Pyrrophyta
