Lisa Guerrero got some samples from random people's shoes, and what she found can truly make you sick.

It's the great shoe debate.

Leave them on or take them off the moment you enter your home?

Disgusting.

It's understandable.

Streets and sidewalks are covered in filth.

Dog poop. Ah!

But we wondered how much of that germy stuff could you really be tracking into your home, and could it make you sick?

Do you ever wonder what's on the bottom of your shoes?

Every day of my life.

Totally at random, we approached dog walker Brittany Lenhart, who says she pounds the pavement 10 miles a day with these dogs.

Can I swab the bottom of your shoes?

Sure, let's do it.

We took samples from her shoes.

We also grabbed some samples from ballet dancer Emma Von Enck.

Also from nurse Emily Veldboom.

Gross.

Then we sent them all to Micrim Labs in Florida for testing.

The results are in, and I've got all the dirty details.

Brittany.

Oh no.

Up first, the dog walker.

You had a bacteria count of 880 million.

Terrible.

That's a lot.

That's a lot.

Five different types of bacteria were found on your shoes, two of which are found in feces.

How does that make you feel?

Not great.

Are you ready for the results?

Hit me, Lisa.

And nurse Emily's shoes.

Your bacteria count was 46 million.

Oh wow.

Four different types of bacteria were found on your shoes, two of which are found in feces.

Oh, no.

I always try to avoid the poop on the sidewalk.

If you have young children or babies crawling on those floors or carpets, you obviously don't want them to be exposed to potentially pathogenic bacteria.

But how much of that bacteria can get tracked back into your home?

To demonstrate, we had Emma, the ballet dancer, keep her sneakers on and walk across this carpet with fluorescent paint on her soles.

Then we turned off the lights and shined a UV light on the floor.

Look at all those footprints.

It's like a crime scene of germs.

I will make it a rule.

There will be no shoes in the house anymore.

Experts agreed, to keep your house clean, be sure to take your shoes off before you go inside.

You can also wipe the bottom of your shoes with an antibacterial wipe.