September 29, 2020
During the Covid-19 pandemic, we’ve all become more aware of the many places germs can live, from certain surfaces of buildings to everyday objects. One frequently touched item that people are rethinking is cash. 
How Dirty Is Cash Anyway?
Over the past six months, many shops and restaurants have gone cashless, instead limiting forms of payment to debit and credit cards or digital systems like Apple Pay. In March, South Korea removed all bank notes from circulation for two weeks for disinfection — and even burned some — to slow the spread of the disease. China took similar steps in February. 
Months into the pandemic, the Centers for Disease Control and Prevention clarified that transmission through surfaces might not be as common as originally feared. But that doesn’t mean paper money is totally germ-free. So how dirty is cash anyway? 
“As humans, we’re bathed in microbes,” Philip M. Tierno, a professor of microbiology and pathology at New York University’s Grossman School of Medicine, told HuffPost. “They’re all over us and the things we handle.”
In 2014, researchers from NYU’s Center for Genomics & System Biology identified roughly 3,000 types of bacteria on cash notes from a Manhattan bank. These microbes included bacteria linked to food poisoning, staph infections, gastric ulcers and pneumonia.As humans, we’re bathed in microbes.Philip M. Tierno, professor at New York University’s Grossman School of MedicineCash money tends to circulate for about 6.6 years, according to the Federal Reserve, so there’s plenty of opportunity to pick up germs. A 2002 study from Wright-Patterson Air Force Base in Ohio tested 68 cash notes and found that 94% were contaminated with bacteria.
“Typically humans deposit bacteria from three areas of the body ― respiratory secretions from the nose and mouth like streptococci, skin organisms like staphylococci, and faecal matter. As a society, we’re actually bathed in faeces,” Tierno said.
“Luckily for us, not everything is a pathogen, and we do have an immune response which tries to combat infection,” he added. “In addition, it takes a certain number of organisms to cause an infection, which varies depending on the pathogen. In order for the body to be infected with salmonella, you’d need to take in or ingest a high amount of bacteria to overcome your normal gut flora, while theoretically only a few viral particles can give rise to an episode of noro-virus.”
He added that scientists are still studying the Coronavirus to see how many viral particles are generally needed to overcome immunity.
Tierno also noted that he’s found more microbes on paper money than on coins.
“Coinage has metal components like nickel, copper, silver and zinc, some of which can be antimicrobial,” he explained. “So on coinage you’ll find lower amounts.”Other factors that affect the microorganism count include how old a cash note is and the time of year.
“New money has a proprietary antimicrobial substance in it, so they’re less likely to support microbes,” Tierno explained. “But it wears out over time, so the older the money is, the more likely there are microbes on it. Heat and moisture also make a difference, so you might find large quantities of microorganisms on money handled by a food vendor in the summer who’s dealing with oily materials that help microorganisms survive more readily.”
Research also suggests that lower-denomination cash notes are likely to have higher quantities of microorganisms because they’re handled more often. 
Other substances frequently detected on cash? Drugs.
There are traces of cocaine on as many as 80% and 90% of cash notes. A 2001 study detected heroin on 70%, methamphetamine on 30% and PCP on 20% of cash.Money is not necessarily the biggest conduit for infection, but any object touched multiple times in the day by different people, like your phone, can be a problem.TiernoYeast, mould, animal DNA and food particles are just some of the other things found on paper currency that might make you want to sanitise your hands a little more often.
Tierno noted that you’re not extremely likely to get ill from cash but emphasised that it’s a good idea to wash your hands when handling money or other high-touch items, especially during the Covid-19 pandemic.
“Prior to touching your mouth, eyes or nose ― big points of entry into your body from your hands ― you should wash your hands,” he said. ”Money is not necessarily the biggest conduit for infection, but any object touched multiple times in the day by different people, like your phone, can be a problem. That’s why you should periodically disinfect your phone as well.”
When it comes to slowing the spread of the coronavirus, Tierno has summed up his views in his new book, “First, Wear a Face Mask: A Doctor’s Guide to Reducing Risk of Infection During the Pandemic and Beyond.”
“Wearing a mask is very important, as is keeping a safe distance,” he said. “That’s a normal thing that people should be doing until we have a vaccine and herd immunity.”Related... Is The 10pm Curfew Doing 'More Harm Than Good'? When Will Routine NHS Dentist Appointments Return To Normal? Third Wave Of Coronavirus 'Entirely Possible', Explains Sage Expert
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Coronavirus disease (COVID-19) is an infectious disease caused by a newly discovered coronavirus.

Most people infected with the COVID-19 virus will experience mild to moderate respiratory illness and recover without requiring special treatment. Older people, and those with underlying medical problems like cardiovascular disease, diabetes, chronic respiratory disease, and cancer are more likely to develop serious illness.

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