Fear of the spreading coronavirus has led to a global run on sales of face masks despite evidence that most people who aren't sick don't need to wear them.

Many businesses are sold out, while others are limiting how many a customer can buy.

Amazon is policing its site, trying to make sure sellers don't gouge panicked buyers.

In South Korea, hundreds lined up to buy masks from a discount store and rumors that toilet paper and napkins can be used as masks have emptied store shelves in Asia of paper goods over the past few weeks.

Fear of the spreading coronavirus has led to a global run on sales of face masks despite evidence that most people who aren't sick don't need to wear them. Pictured: Airport staff check the temperatures of passengers returning from Milan as part of their coronavirus screening procedure at the Debrecen airport, Hungary

People trying to protect themselves from the outbreak and medical centers alike are facing shortages.

The shortages are being attributed not just to high demand, but to disruptions in supply.

An outsize share of the world's surgical masks are made in China - 50%, by its own estimate.

But even factories there that have ramped up production say they are hard pressed to meet local demand. The government has taken over manufacturers, and exports have plunged.

Authorities of major Chinese cities have demanded their citizens wear face masks in public places as mandatory protection to stop the virus from spreading. The picture shows a man wearing a protective face mask taking photos in Jingshan Park, Beijing, on February 25

David Peng, manager of Ningbo Buy Best International Trading Co. in Ningbo, south of Shanghai said: 'Before the outbreak of the epidemic, we used to export 600,000 to 700,000 surgical masks a month, but now the amount is zero.'

The company's dozen or so suppliers in Hubei, near the center of the outbreak, have been ordered to prioritize government orders.

Apart from shortages of workers, manufacturers say they are struggling to get enough raw materials to make the masks.

Tony Zhou, sales manager for Suzhou Sanical Protective Products Manufacturing Co., said his company is asking overseas customers if masks can be delivered a few months later.

In the U.S., Walgreens, Home Depot, Lowe's and True Value Hardware are reporting a sharp uptick in sales of masks over the past several weeks and say they are scrambling to get more from suppliers.

Globally, fear of the spreading coronavirus has led to a run on sales of face masks despite medical experts' advice that most people who aren't sick don't need to wear them. The picture shows people in Hong Kong queuing outside a cosmetic store for buying masks on February 3

Home Depot, the nation's largest home improvement chain, has limited sales of N95 respirators to 10 per person. They have a close facial fit and more filtration material than general surgical masks, enabling them to keep out at least 95% of particles.

Marc Jaconksi, owner of Stanley's True Value Hardware and Rental store in Philadelphia, said he saw a surge in demand for masks, particularly the N95, two weeks ago.

But since Tuesday, when the U.S. Centers for Disease Control and Prevention warned that the virus will almost certainly spread in the U.S., sales went through the roof.

'We would be crazy busy with snow, but we are not getting snow,' he said. 'We're crazy busy with respirators.'

Jaconski said his store has sold 1,000 masks of all kinds in the past two weeks. He has ordered more N95s, but customers are so desperate they are picking up lightweight dust masks or buying heavy-duty respirators used for asbestos cleanup that sell for up to $60.

At least 2,858 people have died and some 83,700 have contracted the coronavirus globally

'It's usually the oldest folks who get a little crazed,' he said. 'This time, it is everybody.'

The virus has infected more than 82,000 people worldwide and killed more than 2,800, according to international health authorities.

Still, the CDC doesn't recommend that people wear masks to protect themselves from the virus. The CDC says people infected - or those showing symptoms such as fever and shortness of breath - should wear masks to avoid spreading it to others. Health care workers also need masks, the agency says.

Mike Gania of the American Society of Health-Systems Pharmacists said some hospital pharmacies are saying that they have only a one to two week supply of masks and that the major wholesalers are unable to fill orders.

Within hospitals, surgical masks are worn by operating room teams - doctors, nurses, anesthesiologists - and frequently by pharmacists. Staff members caring for patients with dangerous infections wear the N95 masks.

Dr. Sarah Boston, a veterinary surgical oncologist and author in Toronto, uses 10 to 15 surgical masks per week in her practice. She switched to a less comfortable brand when her usual supplier ran out.

'I've spoken to a lot of people who are worried that we're going to lose supply or not be able to get them,' she said.

Boston sees a lot of people wearing them incorrectly - over their mouths but not their noses, for example - and said they should understand that other things would be more effective, like frequent hand-washing.

Companies that make masks are struggling to keep up.

Medicom Group, a Montreal medical supply company, usually makes 150 million masks per year at its factory near Angers, France. At the beginning of February, the factory had orders for 500 million masks. Orders have only grown since then, the company said, and it has hired new workers and increased capacity at its plants, including two in Shanghai and one in Augusta, Georgia.

3M, the Minnesota-based manufacturer, said it has ramped up production of respirators at its facilities in the U.S., Europe, Asia and Latin America.

Many people in Asia routinely wear masks against allergies, colds and smog, and soaring demand has prompted other manufacturers to retool to begin making masks.

Pedestrians wearing protective masks while walking along a street in New York yesterday

Taiwan manufacturer Foxconn, a major supplier of electronics to Apple, said it has begun making about 1 million masks a day for its own factories.

Dealmed, a New York company that makes and sells medical supplies, said it expects to sell out of face masks next week.

It temporarily stopped taking orders from new customers a month ago and ended sales on Amazon and Walmart.com. It now is selling only to buyers that need them most, such as hospitals, doctors' offices or government agencies.

Sales of gloves, gowns and other items jumped as much as 300% in February from the year before, said Michael Einhorn, Dealmed's president. Sales of face masks are so astronomical, he said, he hasn't been able to calculate them.

In Italy, the site of Europe's biggest cluster of cases, the government met with the country's business lobby to work out a centralized distribution system to get masks to hard-hit areas.

Italy's financial police announced they busted 20 people based in Turin for selling masks that were falsely said to offer complete protection against the disease. They were selling for as much as 5,000 euro apiece, or about $5,500.

A sign in a hardware store in New York informing shoppers of the lack of availability of face masks and respirators yesterday

On Amazon, the best-selling item in its health and household section Thursday was a pack of three cotton masks for $19.99. Ten-packs of 3M masks were sold out. And a listing for 100 disposable masks said it would arrive at shoppers' doorsteps sometime in April or May.

Prices varied wildly on Amazon. Some sellers were charging $98.50 or more for 50 disposable surgical masks; others were charging $33 for a similar set. Hand sanitizers were also hard to find on the site, with some bottles of Purell and Amazon's own brand sold out.

Dr. John Huber, a clinical psychologist and chairman of the Austin, Texas-based nonprofit Mainstream Mental Health, said retailers need to do a better job of allaying customers' fears and sharing the CDC's advice.

'It's the fear of the unknown,' Huber said. 'Once we understand something, we tend not to be so fearful.'

Coronavirus face masks sell out as prices soar 800%: But do they really work and which one should you buy?

Despite soaring sales in face masks and shops selling out of the products, one medical expert told MailOnline masks 'cannot' protect against the virus and that wearing them may even make it worse.

Meanwhile Public Health England warned that there is 'very little evidence' masks are effective 'outside of clinical settings' such as hospitals.

Yet recent testing by the Health and Safety Executive has found that any kind of protection is better than nothing.

The way you wear a mask is crucially importantly, academics say, because unless it is tight to the nose and mouth contaminated sneezes and coughs will get through - or linger on the surface.

Professor Brendan Wren from the London School of Hygiene and Tropical Medicine, said that masks will not stop people from becoming infected and may even worsen its spread.

Commuters wear protective masks travels on the Jubilee Line and the Central Line (left and right) in London today as face masks sell out

Face masks are running out and increasing in price online as panic over the coronavirus outbreak ramps up but are a more common sight in London

The World Health Organisation recommended that masks should only be worn by those with a cough, fever, or who people who have difficulty breathing.

He said: 'The masks won't protect against the virus because it's so tiny. It is thousands of times smaller than bacteria.

'I don't think they do any good. They are smaller than air particles for pollution that we worry about. It will simply be breathed in.'

He added that masks may make the spread of the virus more likely if they become damp.

'They may make matters worse, [such as] if they become damp. If you have a cold or sneezing, sneezing into a mask can make matters worse.'

He added: 'The main purpose is a psychological thing they make people more aware but physically they are not a prevention'.