Nowhere is spreading.

But where did it come from?

That's the first thing we're looking for today on CNN 10.

And we're happy to have you along for the hunt.

I'm Carla Zeus.

The first known cases of the new Corona virus appeared last December in Wuhan, China.

It's a city in the east central part of the country.

At first, scientists widely believed the outbreak started at a seafood and animal market in Wuhan that someone came into contact with Cove in 19 there and then began spreading it to others.

But now researchers are divided on that explanation because some of the first people with the disease reportedly hadn't been to the market.

Since December.

China says it's had more than 82,000 cases of Corona virus that more than 3300 people have died from it and that more than 77,000 have recovered.

But some international observers and health officials have suggested the numbers might be higher than that.

They've accused the Chinese government of not telling the whole truth when it comes to the number of cases and deaths from Corona virus.

Chinese government officials say they've given open, transparent and timely updates, and they've accused nations like the United States of trying to politicize the virus because there's so much mystery about it.

There are a number of conspiracy theories surrounding Cove in 19 beliefs that an accident or even intentional action by humans led to the virus is spread.

But some of the scientists who tracked down the origins of disease is saying that's not what happened.

CNN has spoken to 1/2 dozen virus hunters who right now, say anyone who claims they know the exact source of the novel Corona virus is guessing.

Did it come from bats?

Most likely, Chinese researchers have already determined the Corona virus is 96% identical at the whole genome level to a Bat Corona virus.

27 public health scientists from across the U.

S.

And the world wrote this letter in the journal Lancet, condemning conspiracy theories and citing scientific evidence, including the U.

S.

Centers for Disease Control that supports the theory that overwhelmingly conclude that this Corona virus originated in wildlife, as have so many other emerging pathogens.

The common thread is wildlife.

These pathogens emerge from wildlife.

One of those scientists is one of the most preeminent virus hunters in the world.

Peter Dacic.

Because we've been doing this work in China for 10 years, we have a whole series of genetic sequences of viruses were found with our colleagues.

So when they got a new virus in people the cause of coded 19 they could compare it to what they'd seen in bat.

So they knew straightaway.

This is likely of that origin virus and because it has that 96 percent comparison rate to what was actually in a bad.

That's why you're saying it's very, very likely this did come from a bat, although we don't know what this where this train actually came from.

We're very confident that the origin of Kobe, 19 is in bats.

We just don't know where exactly originated.

That's what we need to do now.

About it is a genetic detective story.

Researchers will trace the virus that is killing thousands to a yet to be captured bad in the wild toe, a potential animal that became the crossover vehicle for covert 19.

Yes, the virus could have transferred directly from back to human, but most likely, says Dash, it was bats, infecting farmed animals, the animals brought to market alive and kept with people in one of the most perfect incubators for viral infection.

The Chinese wet market.

It's called zoonotic spillover.

Professor Andrew Cunningham with the Zoological Society of London, has studied them for decades.

Wet markets these live on more markets are sent me a very good way off on if you like trying to get a virus to spill over into people from wildlife, they're susceptible to getting viruses or other pathogens from the environment or from other animals that they wouldn't naturally come into close contact with again because their stress on then it can become virus factories.

And they're in close contact with human beings in the markets, on their pictured in the markets on by people in relatively unhygienic conditions.

Other researchers point to reports from China that some of the earliest cases were not associated with the wet market.

Tensions between the U.

S.

And China over the origins of the virus and accusations of misinformation from both sides are slowing the work of the virus hunters who are grounded by the same travel restrictions that have crippled the world.

That is, concerning because without knowing where it came from, there is still a chance that original host species is spreading it.

Second, trivia, Which of these U.

S.

Landmarks was completed last Empire State Building, Alcatraz Island Prison, Hoover Dam for Golden Gate Bridge.

Landmarks are in order from oldest to youngest.

The Golden Gate Bridge was finished in 1937.

The U.

S Navy wanted it to be painted black and yellow so it would be visible.

The Army Air Corps wanted red and white for the same reason.

But the consulting architect of the Golden Gate Bridge, like the color of the primer, used to coat the steel.

So that's the color he kept it.

It was named International Orange, and the bridge is the next stop In our series of virtual vacations.

Bridge gets its name because it spans what's called the Golden Gate straight.

This is a three mile long and one mile wide body of water that connects the Pacific Ocean to the San Francisco bank.

Before the Golden Gate Bridge, there was a bustling ferry system that people and commerce between San Francisco and the Redwood Empire to the north, it's actually unknown.

How many people worked on the Golden Gate Bridge at the time of construction because records were scarce from that time.

Today we have close to 200 employees who work to maintain to paint.

Well, Thio, make sure that the bridge is in good on safe operating conditions.

So we're right now getting sand blasting on the outer part of the bridge, which is up underneath right now.

Working with the walkway is where the pedestrians ride after 3 30 So the cars are probably just about 15 feet out.

You can't feel it, but the bridge is fine moving.

You know, like this.

We're staying in a containment like this.

A rough estimate.

16 people sand blasting for a month and 1/2 are.

Painters will go out to the most critical structural areas of the bridge where the fog and the salt and the wind has corroded paint.

Salt eats this bridge.

The fog Eat this bridge up.

If we don't continue to paint it, it's just gonna rot away.

Right here is one of our foghorns.

We'll have two of them down here, 1/1 on the east side, one on the west side.

We've always had foghorns here at the bridge since since it was built not much changes in fog horns.

They just make noise.

Tried automated systems.

It just doesn't doesn't work so that the old standby system of actually visually seeing works the best because there's people here 24 7 So, as of July 2018 told across the Golden Gate Bridge is $7.

If you have a fast track, $8.

If you don't, maybe you're from out of town.

And this supports much of the work that happens on a daily basis to maintain the bridge, to keep it looking good and ensure that it's accessible for everyone.

Pretended to 10.

It's not every day you get to use the word soft banana for that again.

It's not every day you get to see one that looks like giant circles of silly string.

This is a sea creature, really a whole colony of them that was recently captured on camera Curly cute in the Indian Ocean, the Schmidt Ocean Institute says this could be the biggest SaiPan afore ever recorded.

With an outer ring that stretches 154 feet, I've made a pawn in a siphon afore SaiPan A.

Before first, I strung together three ocean puns like it was a sight to see it made waves.

And then I was able to siphon off, for there are always fun to string along, even if they're a bit silly.

I guess whether or not you like ocean puns depends on your depth.

Perception up Carla Zoos Mitchell District High School is in Mitchell, Ontario, Canada.

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That's a wrap for CNN.