How Many Germs Are There On A Door Handle

On a hard non porous surface like a door handle most viruses are destroyed within 24 hours.

How many germs are there on a door handle.

Sum ming simon wong 17 and kin pong michael li 18 presented the design of their nifty door handle at the intel international science and engineering fair on may 12. Similar numbers were found in another carried out by gerber. Which would you think is safer to touch. One study found more than 3 000 micro organisms per square inch on keyboards and over 1 600 bacteria per square inch on a computer mouse.

Plus there isn t a way to get around touching it either. In lab tests their system killed about 99 8 percent of the germs that they spread onto lab dishes coated with their material. Salmonella only lasts four hours but mrsa can last several weeks and c. Research by others has shown that door handles in public areas often host lots of bacteria and viruses notes 17 year old sum ming simon wong.

September 8 2014 6 36 pm cbs news. 1000 words oleg doroshin. One study found 1323 bacteria colonies living on just 27 door knobs. Difficile has been found to survive for up to five months.

A budget grocery store cart has 8 112 bacteria colonies per square inch while a toilet handle only has 30 bacteria colonies per square inch. There are sometimes up to 229 000 germs per square inch on the handles of frequently used faucets. The door handle is coated with titanium dioxide a mineral that kills bacteria and is found in paint and sunscreen. Many people worry about catching a virus from a sick coworker but.

You might worry less if these are your own bacteria but if you are hot desking then other people s germs could be transferring onto your hands. Here s how it works. Door knobs are a hotspot for bacteria in the home and public places. There are 200 000 bacteria per square inch in your carpet which is a lot more than your toilet seat.

On clothing or skin the survival time is roughly halved. Not surprising when you consider that the millions of skin cells you and the fam shed hourly. One experiment conducted took both a stainless steel plate which is what most door handles are currently made from and a copper plate coating them both with 10 million cells each of mrsa.