How Many Germs Are There On A Door Handle

There are sometimes up to 229 000 germs per square inch on the handles of frequently used faucets. In lab tests their system killed about 99 8 percent of the germs that they spread onto lab dishes coated with their material. 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.

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How many germs are there on a door handle.

Plus there isn t a way to get around touching it either. On a hard non porous surface like a door handle most viruses are destroyed within 24 hours. Many people worry about catching a virus from a sick coworker but. Door knobs are a hotspot for bacteria in the home and public places.

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. On clothing or skin the survival time is roughly halved. 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. 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.

Which would you think is safer to touch. One germy doorknob can infect half your office within hours. 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. Here s how it works.

The survival time for bacteria is more variable. Difficile has been found to survive for up to five months. Salmonella only lasts four hours but mrsa can last several weeks and c. Not surprising when you consider that the millions of skin cells you and the fam shed hourly.

Traditional grocery store shopping carts have 361 times more bacteria than a bathroom door knob. 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. Similar numbers were found in another carried out by gerber. There are 200 000 bacteria per square inch in your carpet which is a lot more than your toilet seat.

One study found 1323 bacteria colonies living on just 27 door knobs. September 8 2014 6 36 pm cbs news. The door handle is coated with titanium dioxide a mineral that kills bacteria and is found in paint and sunscreen.

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