Hygiene & Bacteria
Hygiene at the Office: Keyboard, Phone and Door Handle Under the Germ Microscope
The desk is often seen as a clean place – but keyboards, phones and door handles frequently carry more germs than a toilet seat, simply because they're rarely cleaned. According to research cited by the US outlet MarketWatch, an office phone was found to carry over 1,600 bacteria per square inch, a hand-washed mug handle 2,200 – a toilet, by comparison, only 59.
Why the desk seems deceptively clean
An office has no obvious sources of dirt like street grime or raw food – yet objects that are constantly touched but rarely cleaned still build up substantial germ counts. Keyboards and mice are considered, across several studies cited here, the most heavily contaminated office items of all.
The germ hotspots at a glance
- Keyboard and mouse: touched most often, cleaned least often.
- Phone handset: over 1,600 bacteria per square inch, according to the cited research.
- Mug handle (not machine-washed): up to 2,200 bacteria per square inch.
- Door handles, light switches, lift buttons: touched by many different people, making them especially relevant for spreading illness during cold and flu season.
What simple recommendations say
Germany's AOK health insurer recommends cleaning your own keyboard about once a week. For shared contact surfaces (handles, switches), several sources cited here recommend daily cleaning, more often during cold and flu season. For keyboard, mouse, phone and desk surface, an occupational medicine source recommends a lint-free cloth, lightly dampened with warm water and a few drops of washing-up liquid.
Frequently asked questions
Is occasional wiping enough, or do I need to disinfect?+
For most everyday office situations, regular cleaning with a mild cleaning agent is enough. According to an occupational medicine source, frequent use of disinfectants can even promote bacterial resistance and contact allergies – thorough cleaning is usually the better choice over constant disinfecting.
Sources
- Büro & Technik Wernigerode: 'Hygiene im Büro: Tastatur und Telefon sind tückische Keimträger' – MarketWatch-zitierte Bakterienzahlen (Telefon, Tassenhenkel, Toilette)
- RHT Happle: 'Büro-Hygiene: Checkliste & Keim-Hotspots' – Reinigungsintervalle, Keim-Hotspots im Büro
- Arbeitsmedizin Dr. Dr. Eva Cramer: 'Hygiene im Büro: Tastatur und Co. sauber halten' – praktische Reinigungsanleitung, Hinweis zu Desinfektionsmittel-Resistenzen
- AOK: 'Tipps für mehr Hygiene am Arbeitsplatz' – Reinigungsempfehlung Tastatur wöchentlich
Author: Moritz Weinert, Gründer NURO Labs · Last updated on 8 September 2026