Handwashing
CDC still teaches 20 seconds as a public gesture, not a lab timer you must worship.
Those two sentences can live together. Hospitals are not living rooms. This atlas will not tell you to eat dirt or to skip a vaccine.
The local trap is disinfectant marketing that promises a sterile house. Skin and gut communities never signed that contract.
Local notes
Hygiene hypothesis
A research story about early exposures — not a parenting dare.
Antibacterial soaps
US regulators restricted some consumer antibacterials. Plain soap remains the public default.
Official pages own schedules and treatment. This atlas does not.
More in Change & defence
Mutation and variants
Populations of genomes, not cartoon villains — RNA viruses copy sloppily, and public-health names track clusters that spread.
Familiarity 92Antibiotic resistance
A shared drug budget under selection in hospitals, farms and wastewater — stewardship, not a lab manual.
Familiarity 85Vaccines and immunity
Antibodies, memory cells and community arithmetic — conceptual, not a prescription and not an anti-vaccine tract.
Familiarity 94Biofilms
Surface cities of microbes — plaque and catheters explain persistence, without a grow-your-own kit.
Familiarity 38Horizontal gene transfer
Sideways DNA traffic — conjugation, transduction, transformation as names and history, not protocols.
Familiarity 45