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Glossary

Epithelium

Epithelium means "cover tissue" that covers the whole surface of the body and lines the surfaces of hollow organs (e.g. intestine, bladder, etc.) The epithelium is composed of tightly single or multi-layered cells.

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International Campaign Days

Campaign days raise awareness of the importance of cleaning and disinfecting hands and surfaces in the health sector, addressing sepsis and antibiotic resistance. Find all information about these annual events here.

International campaign day: World Hand Hygiene Day on 5 May 2025

Two hands touching. Other hands in the background.

On May 5, 2025, as every year, the WHO is reminding people of the importance of hand hygiene in the healthcare sector and beyond.