01 / The world before
Before germ theory, clinicians did not understand all routes of infection.
02 / The discovery
Evidence linked hand cleaning with reduced transmission.
03 / The people
Clinicians, microbiologists, nurses and infection-control teams.
04 / The obstacles
Habit, supply and institutions determine whether knowledge changes practice.
05 / The world after
Hand hygiene became an essential part of safer care.
06 / Why it still matters
Clinics need water, supplies and training, not a slogan alone.