1 · What Is Microbiology?
- Study of microscopic plant & animal organisms that need a microscope to see.
- Medical microbiology = virology, bacteriology, parasitology.
- Plant microbiology = microbes affecting plant growth & food-crop protection.
Mnemonic — medical micro = V·B·P“Very Busy Pervs.” Virology · Bacteriology · Parasitology.
2 · Classification & Binomial System
Species→
Genus→
Family→
Order→
Class→
Phylum→
Kingdom→
Domain
Mnemonic — smallest → largest“Sexy Girls Feel Orgasms Coming — Please Keep Dicking.”
Species · Genus · Family · Order · Class · Phylum · Kingdom · Domain.
Binomial systemTwo-word Latin name = Genus + species (e.g. Homo sapiens). Genus capitalized, species lowercase.
3 · Cell Theory & Cell Types
- Cell theory: all living things are made of cells; cells come from other cells.
- Eukaryotes: complex, multicellular, have organelles (nucleus, mitochondria).
- Prokaryotes: simple, single-celled (bacteria). Cell membrane, sometimes a capsule or slime layer, plus flagella (movement) or pili (sticking).
Mnemonic“Pro = no home (no nucleus, just a slimy coat); Eu = trust-fund mansion (nucleus + mitochondria).”
Mnemonic — cell theory“No cell is ever a virgin — every new cell came out of another cell.”
4 · Cell Transport & Absorption
| Type | Energy? | Includes |
|---|
| Passive | No | Diffusion, osmosis |
| Active | Yes ✔ | Endocytosis |
Mnemonic“Passive = lazy starfish — it just lets it flow in. Active = you’re doing the work.” Endocytosis = the cell swallows a particle whole.
5 · Identifying Microbes
- Culture — grow the organism.
- Staining — Gram stain, acid-fast stain, capsule staining.
- Microscopy — look at it directly.
Mnemonic — 3 ways“Cook, Color, Creep” → Culture, Coloring (stain), Creep a look (microscope).
6 · Microscope Parts
| Zone | Parts |
|---|
| Head | Ocular (eyepiece) · tube |
| Arm | Arm · nosepiece |
| Middle | Objective lens · rack stop · stage |
| Base | Illuminator · condenser · focus knobs |
Mnemonic — the microscope is a guy“Head, Arm, Junk & Feet.” Head = ocular/tube · Arm = arm/nosepiece · Junk = objective/stage/rack stop · Feet/base = illuminator, condenser, focus knobs.
Function refresher: ocular + objective magnify · condenser focuses light up · illuminator is the light source · stage holds the slide · focus knobs sharpen it.
7 · Microbe–Host Relationships
| Relationship | Who benefits? | NSFW hook |
|---|
| Mutualism | Both ✔✔ | “69 — everybody gets off.” |
| Commensalism | One benefits, other unaffected | “You get off, they don’t even notice.” |
| Parasitism | One benefits, other harmed | “Clingy ex who drains you dry.” |
| Symbiosis | Umbrella term — living together | “It’s complicated.” |
Key ideaRelationships can be beneficial, neutral, or harmful — and they can change with the environment (a friend today is a freeloader tomorrow).
8 · Requirements for Infection & Disease Transmission
Entry site+
Enough microbes+
Suitable environment+
Compromised host
Mnemonic — 4 requirements“Every Sick Slut Compromises.” Entry · Sufficient numbers · Suitable environment · Compromised immune system.
Mnemonic — transmission routes“Dirty Airborne Bodily Orifices.” Direct contact · Airborne (droplets) · Body fluids · Oral transmission · portals of entry.
9 · Phases of Infection
Incubation→
Prodromal→
Acute→
Convalescence
Mnemonic“I’ll Pay After Cumming.” Incubation · Prodromal · Acute · Convalescence.
- Incubation = infected, no symptoms yet.
- Prodromal = first vague symptoms.
- Acute = full-blown illness.
- Convalescence = recovering.
10 · Nosocomial & Prevention
- Nosocomial = hospital-acquired. Includes cross-contamination and surgical-site infections (SSIs).
- Managed with isolation & treatment.
Mnemonic“The hospital dick move” — you didn’t walk in with it, you caught it in the building.
Prevention: handwashing (the #1 move) · standard precautions · aseptic technique · hygiene · sanitation · antiseptics/disinfectants · isolation.
Surgical tie-inHand hygiene + sterile field + aseptic technique are what stop SSIs. Break technique once and the whole case is compromised.
11 · Bacteria (the big one)
| Feature | Details | NSFW hook |
|---|
| Structure | Individual or in colonies | “Some roll solo, some run in packs.” |
| Shape | Cocci (round) · Bacilli (rods) · Spirochetes (spirals) | “Balls, Boys & Screws.” |
| Motility | Flagella (swim) · Pili (stick) | “Flagella = the whip; pili = the velcro.” |
| Oxygen needs | Aerobic (needs O₂) · Anaerobic (no O₂) · Facultative (either) | “Aerobic = loves it wet & breathless; Anaerobic = only in the dark, no air; Facultative = switch-hitter, takes it any way.” |
| Nutrients needed | Carbon, oxygen, nitrogen, hydrogen, phosphorus, sulfur, potassium | “C, O, N, H, P, S, K — the seven-course meal.” |
| Reproduction | Asexual fission; spore formation | “Split & go dormant — spores are the survival bunker.” |
| Growth phases | Lag → Exponential → Stationary → Death | “Limp Erections Suddenly Die.” |
| Pathogenicity | Endotoxin (inside Gram-negative wall) · Exotoxin (secreted) | “Inside job vs. the oversharer.” |
11b · Important Bacteria & Multidrug-Resistant Organisms
Mnemonic — key pathogens“Some Sexy People Never Eat Salty Clam Meat Raw.”
Staphylococcus · Streptococcus · Pseudomonas · Neisseria · Escherichia · Salmonella · Clostridium · Mycobacterium · Rickettsiae.
| Abbrev. | Meaning | Hook |
|---|
| MRSA | Methicillin-Resistant Staph. aureus | Mean Resistant Staph Asshole |
| MSSA | Methicillin-Sensitive Staph. aureus | The one wimp — still killable with plain methicillin |
| VRSA | Vancomycin-Resistant Staph. aureus | Very Rotten Staph Asshole |
| VISA | Vancomycin-Intermediate Staph. aureus | Half-way to unstoppable |
| VRE | Vancomycin-Resistant Enterococcus | Very Resistant Entero |
| MDR-TB | Multidrug-Resistant Tuberculosis | TB that won’t die |
Mnemonic — the resistance list“MVVM — MRSA, VRSA, VISA, VRE, MDR-TB — and the lone softy MSSA.” If it starts with M/V it’s resistant; MSSA is the only sensitive one.
Surgical tie-inMRSA/VRE live on skin and equipment — the reason for contact precautions, gowns, gloves, and terminal cleaning between cases.
12 · Viruses
- Nonliving infectious agents — not cells. Called virions.
- Must have a host cell to replicate (can’t do it alone).
- Transmission: inhalation · food · water · body fluids · insects.
- Examples: HIV (blood, semen, vaginal secretions, breast milk) · hepatitis viruses (multiple routes) · HPV (sexual contact).
Mnemonic“Viruses are the ultimate freeloaders — no job, no body, can’t even reproduce without crashing on someone else’s couch.”
13 · Fungi
- Molds = multicellular · Yeasts = unicellular.
- Reproduce sexually and asexually.
- Infect skin, hair, nails, mouth, vagina.
- Pathogenic: Aspergillus · Candida · Pneumocystis · cutaneous mycoses.
Mnemonic — the fungal threesome“A Cheap Pussy” → Aspergillus · Candida · Pneumocystis.
Mnemonic — where they love to party“Warm, wet, dark — feet, mouth, crotch.” That’s why yeast infections & athlete’s foot show up there.
14 · Protozoa & Algae
- Protozoa: single-celled eukaryotes, mobile in water, cause various diseases (e.g. malaria).
- Algae: eukaryotes in the plant kingdom — includes sponges & seaweed.
Mnemonic“Protozoa = the swimmers.” Water + single cell + flagella = trouble. Algae = the plant-kingdom hippies — mostly harmless, just float around.
15 · Immunity & Defense
| Type | How it works | NSFW hook |
|---|
| Innate | Nonspecific, from birth. Skin, respiratory & GI tracts, resident microbes, inflammatory & cellular responses. | “Born with it — like a natural talent.” |
| Adaptive | Acquired after exposure. Active = your body forms antibodies. Passive = received from an outside source. Vaccines fall here. | “Learned it the hard way.” |
| Active vs Passive | Active = you made the antibodies. Passive = someone handed them to you. | “Active = you did the work. Passive = you got the charity.” |
| Hypersensitivity | Allergies, cytotoxic reactions, antigen-antibody reactions, cell-mediated reactions. | “Immune system overreacting like a jealous ex.” |
| Autoimmunity | Body attacks itself — e.g. lupus, rheumatoid arthritis. | “Your immune system burns down its own house.” |
Surgical tie-inImmunosuppressed patients (chemo, steroids, transplant) = higher SSI risk; extra aseptic vigilance and a watchful eye post-op.