Outer membrane
LPS can trigger inflammation if the cell reaches blood — a hospital story more than a kitchen one.
In the colon, facultative anaerobes like E. coli use leftover oxygen and simple foods. That is ordinary ecology.
STEC make Shiga toxins that can damage blood vessels and kidneys after a foodborne dose — a public-health fact, not a synthesis note.
Parts
Flagella
H antigens and swimming help some strains move in mucus.
Pili and adhesins
Pathotypes use them to stick to small-bowel or large-bowel surfaces.
Shiga toxin
In STEC, a phage-encoded toxin is the headline danger after some foodborne infections.
Plasmids
Extra circles can carry adhesion or resistance luggage.
Vitamin K role
Some gut E. coli contribute menaquinones used in clotting chemistry.
Life cycle
1Colonize or ingest
Newborns acquire flora; later, food or water can add a pathotype.
2Reside or invade
Commensals stay put. Pathotypes stick, toxin, or invade according to type.
3Shed in stool
Both neighbors and pathogens leave in feces — the reason for hand and water hygiene.
4Detect or fade
Labs type outbreak strains. Most commensal encounters never become a headline.
No culture methods are provided.
Keep exploring
More in Encounters
Influenza
A winter respiratory virus of drift and rare shift — surveillance and vaccines, not a cartoon villain.
Familiarity 93Tuberculosis
An airborne bacillus of latency and long care — programmes and air, not a drug recipe.
Familiarity 70Staphylococcus aureus
A common skin neighbor and a resistance story called MRSA — not scare porn.
Familiarity 78Norovirus
A very-low-dose gut virus of schools and ships — soap and bleach surfaces, not alcohol-gel faith.
Familiarity 80Helicobacter pylori
A gastric spiral that rewrote the ulcer textbook — Nobel 2005, Korea's high historic prevalence, no recipes.
Familiarity 68