Nurse!

Justin Bieber's tour is the latest live act to feel the effects of the coronavirus ... he's downgrading the venue size in several "secondary markets" and it's all because of the virus.

Bieber's got a massive stadium tour planned for the summer to promote his hugely successful 'Changes' album. Friday they announced stadium stops in Cleveland, Detroit, Arlington, Columbus and Nashville were canceled and moved to local arenas ... essentially cutting seat capacity in half.

Turns out just 3 days after Justin announced his tour ... coronavirus fears really blossomed. We're told prior to the news, ticket sales were hugely successful but then slowed in smaller markets.

Sources close to Justin say his team made the decision to relocate several tour stops to guarantee they could fill seats instead of performing to a half-empty stadium. We're told it's possible he could do multiple shows at one arena.

Justin isn't the only artist to feel the effects of coronavirus, Miami's Ultra Music Festival and SXSW in Austin, Texas were both canceled earlier this week.

Daymond John isn't one of the smartest business people around for nothin' ... 'cause he's already figured out how we can make the best of a bad situation and actually benefit.

Seriously ... at first it seems like heresy, talking about the upside of the virus, but he really makes compelling points. Think about how our economy can benefit from more domestic manufacturing, how people will save time commuting if they end up working from home, how people might eat healthier at home than if they were going out to restaurants every night.

Well, Daymond's not scared yet about going to restaurants, because we got him at the famed Dan Tana's Steakhouse on the Sunset Strip.

When life gives you fears over coronavirus ... make some hand sanitizer and sell it at your lemonade stand!!!

Check out these funny pics of two young entrepreneurs in Texas ... the kids are putting a twist on the classic suburban lemonade stand by hawking bottles of hand sanitizer for $3 a pop.

These smart salespeople are cashing in on the hand sanitizer craze ... as you know, people are stocking up on the stuff over fears of catching coronavirus, and stores across the country are selling out ... and they're taking extra precautions by including their Venmo. Money is dirty!

This lemonade hand sanitizer stand is right outside Austin ... makes sense, the city just declared a local disaster and the upcoming SXSW music festival is canceled.

Gotta hand it to these kids, they're making the most of a bad situation ... looks like the country is in great hands!!!

Coronavirus could explode in the nation's jails as inmates are squeezed in like sardines in filth.

TMZ has contacted various jails, including L.A. County Men's Jail as well as jails in San Francisco and New York. They all say they are wiping down surfaces at least daily and ramping up sanitation efforts.

Tell that to Jose Abalos, who just got out of L.A. County Men's Jail for "regular carjacking." He says he was placed in a cell that had not been cleaned from the previous inmate and it was disgusting ... it smelled like urine. He left Friday morning with a cough and wheezing. He says the jail gave him meds but he's worried and is going to a doctor.

Abalos also said no one from the jail told the inmates anything about coronavirus or how to prevent it.

Another inmate, Arturo, also was released from L.A. County Men's Jail Friday morning, and he says there was blood and fecal matter on the walls and says the place was dirty and disgusting. He says he had one shower in 20 days.

Dr. Oz is moving on from his crusade against breakfast to urge people to quit another customary activity in everyday life -- shaking hands.

The TV doc tells TMZ ... coronavirus fears are warranted because it's proving to be 5 times more contagious than the seasonal flu, but there are immediate steps everyone can take to help limit its spread. First and foremost ... cancel handshakes.

Dr. Oz points out that COVID-19 has elements which make it very difficult to control -- something he alluded to in January -- but by replacing a handshake with a fist bump, there's 10 times less bacteria transferred ... so that's a good start.

He even offers a fun way to do the friendly exchange, compliments of Rev. Run. You gotta check it out.

The NBA is working like crazy to make sure its players are clear of the coronavirus ... sending out a memo with tips on how to avoid the dangerous disease.

FYI -- there have reportedly been 90,000 reported cases worldwide ... with 6 deaths in the U.S.

Just days after Trail Blazers superstar CJ McCollum tweeted he's putting autograph signing on hold out of fear of coronavirus ... the Association is following suit by sending out a list of recommendations to keep from getting affected.

The memo suggests players fist-bump fans instead of shaking hands ... as well as avoiding sharing pens, balls, jerseys or other items during autograph signings, according to ESPN.

The NBA worked with the Centers for Disease Control and Prevention and other experts to figure out a strategy to help all the players.

In a statement to the AP, the league said, "The health and safety of our employees, teams, players and fans is paramount."

"We are coordinating with our teams and consulting with the CDC and infectious disease specialists on the coronavirus and continue to monitor the situation closely."

The league is also worried about pre-draft workouts and international scouting events being limited or canceled due to coronavirus.

The coronavirus has people freaking out and stocking up on basic survival supplies -- like hand wipes, for example -- but there's a problem ... not enough to go around!!!

TMZ spoke with Dutch Harbor Brands -- one of the biggest hand wipe manufacturers in the country, which produces the popular Wipex brand and other antiseptic products -- and they tell us their company (and their customers) are about to see a massive shortage.

A rep says in a week ... all wet wipes produced by Dutch Harbor will be SOLD OUT, like completely. We're told demand has been through the roof these past several weeks -- mostly via Amazon and mostly overseas in places like Hong Kong, where folks are buying up wipes in bulk. Because of the surge, Americans are gonna be s*** outta luck pretty soon.

Not to worry though, we're told DHB is working around-the-clock on producing more wipes to meet the massive demand. They're also putting a limit on individual purchases.

That's not the only company facing supply and demand woes right now -- we've learned Costco is also hurting because of the coronavirus scare. A high-ranking manager from corporate tells us some of their staple "survival" goods, if you will, are running low.

For example, we're told stuff like water, canned goods, paper products and sanitizer have been flying off the shelves across America. Oddly enough, fresh meat too!!!

Our sources tell us Costco brass are having meetings this week to discuss the spree, and are considering putting limits of their own on what members can buy -- specifically, in California. People should be good for the next few weeks, but we're told they're feeling coronavirus fever too.

In other words ... get your stuff now!!! We're at threat level midnight here, people.

The coronavirus outbreak in Italy has gotten so bad, some of their hotels are starting to look like a scene straight out of 'E.T.' ... it's hazmat suit galore.

Check out this snapshot of what appear to be two hotel workers -- or public health workers, perhaps -- recently rolling a cart of food through a hotel hallway in Alassio, Italy. The two people here are covered from head to toe in protective gear to keep them virus-free.

Unclear which facility this is, but according to reports on the ground -- at least two hotels in that city have been placed under quarantine, including the Bel Sit and the Al Mare. Apparently, dozens of guests have been diagnosed with confirmed cases of coronavirus.

When it comes to the country as a whole, reports say Italian authorities have announced the infected have risen by 40% to 1,576 in 24 hours. Several people there have already died.

In any case, it's wild that this is where other countries are in what's clearly become a global health pandemic -- and perhaps more concerning is what this might mean for the States.

Of course, President Trump has formed a special committee -- being headed up by VP Mike Pence -- to combat and contain the outbreak here at home ... and his administration has insisted the risk of contracting the virus for the average American remains low.

It's a little to swallow that pill when you see what's happening just across the pond 😬

A top cruise line is taking new measures to keep coronavirus off its ships and to keep passengers happy -- but even sick guests and those who have traveled in impacted countries are encouraged to return ... once they've recovered, of course.

Carnival Cruise Line -- one of the 9 cruise brands under the Carnival Corp. umbrella -- tells TMZ ... it's implemented an enhanced screening process due to concerns over coronavirus, and guests who are deemed unable to board at the terminal will get all their money back.

On top of that, we're told the sick guests will be reimbursed for transportation, and bonus -- they'll also get a 20 percent credit for a future cruise. A pretty decent consolation.

As for other safety precautions ... CCL says it's worked with the CDC and the World Health Organization to update screening procedures. Additionally, anyone who's traveled to China, Hong Kong, South Korea or Macau within 14 days of their cruise's scheduled departure will not be allowed to set sail.

Meanwhile, Crystal Cruises are also offering ill or restricted passengers an option plan -- 100 percent refund or a 125 percent future cruise credit -- but ONLY if they notify Crystal within 7 days of departure. Otherwise, we're told there could be cancelation fees.

The cruise industry, in particular, is taking coronavirus very seriously after a Princess Cruise liner was quarantined for 2 weeks earlier this month with 3,700 passengers on board. The ship was isolated in Japan's Yokohama Bay when at least 700 guests were reportedly diagnosed with the virus. They were eventually evacuated, but 4 of them have died.