You might want to sit down for this -- or maybe not. This is a story about germs on public seats, and just how common and hazardous they might be.
When "Good Morning America" learned that Bay Area Rapid Transit commuter train seats in San Francisco had recently tested positive for all sorts of bacteria, our first reaction was, "Eeeeuuuww!"
And our second reaction was: Is it just the BART seats, or are all public seats germ factories? So we decided to go visit BART and test every seat we sat in along the way.
Click HERE to see the rest of our results and to get tips for warding off germs.
Our journey began with a single swab -- on the seat of my car in Washington, D.C. -- and ended 3,000 miles away in San Francisco. Along the route, my producer and I swabbed every seat we came into contact with.
We tested the airport waiting area, the plane itself, the back row of a movie theater and a restaurant in the heart of San Francisco's Chinatown, where a creepy coincidence made us think we'd find germs for sure.
More on that later.
The Dirty Dozen?
When we were done, we'd gathered samples from 12 targets anyone could encounter on a trip -- the seats in a car, taxi, airport, airplane, rental car, restaurant, hotel lobby, hotel room, movie theater, park bench and toilet seat. Then, finally, BART itself. Would they be the dirty dozen?
Bacteria build-up on the cloth seats in San Francisco's commuter trains had been a "sticky" point for riders for a long time.
One rider said she avoids the seats at all costs, adding that she'd have to be "dead tired" to sit down on the train.
"The fabric covers are really filthy," said another rider, while a third noted, "I might think twice about sitting down."
BART spokesman Linton Johnson said passengers seem to overlook the fact that it's people who bring bacteria on to the trains.
"When you have 350,000 tushes on these seats, it's going to get a little bit of bacteria on them, you know?" he said.
That's why BART provides hand sanitizer at some stations, and why every night, BART employees swap out the very worst seats. Every year, the system spends about $600,000 dollars on dry cleaning.
And now, it's time for the results of the tests on the samples we gathered.
We sent our samples to New York University's microbiology department to be analyzed by a germ guru, Dr. Philip Tierno, the director of microbiology and immunology at the NYU Langone Medical Center.
"There were so many organisms on these seats that I would say that they were never cleaned or rarely cleaned, and that is something to be reckoned with," Tierno said.
Nearly 28 percent of the seats contained traces of E. coli.
More than half, 52 percent, of the samples showed indications of fecal matter.
But BART wasn't one of them. Other not-so-bad seats from our experiment?
My car. Phew! The hotel and the toilet seat. That's right. No E. coli where you'd expect and accept it.
Remember the restaurant in Chinatown where we predicted we'd find bad bacteria? We thought we would because, as we were finishing our lunch, a health inspector department inspector asked us to leave. They locked the doors and closed the restaurant after we left.
Turns out the restaurant had cockroaches, but no significant bacteria. Go figure. The restaurant has since taken care of the problem and re-opened.
It's time now for the doozies.
The Results Are In
Even though our rental car had only 714 miles on it, our tests revealed hundreds of E. coli colonies.
Another germy one? A bench in the middle of San Francisco's Union Square.
There was staph on a movie theater seat, which can cause devastating infections.
My airplane seat was bad, but the airport lounge was worse. After all, thousands of travelers share it. There were organisms indicating fecal matter, E. coli and yeast.
"Where you find this number of organisms it means nobody's worried about cleaning anything here," Tierno said.
So the next time somebody tells you to please have a seat, keep your hands to yourself.
For our latest "GMA germ test," we tested for bacteria on public seats. When we heard that BART commuter train seats in the San Francisco Bay Area had recently tested positive for all sorts of bacteria, our first reaction was "yuck!" Our second reaction was, I wonder if it's just BART or if all public seats are germ factories? So we decided to travel from The East Coast to San Francisco to visit BART and test every seat we sat in along the way.
Here's a table showing what types of seats we tested and how they did.
The Not-So-Bad Seats: These seats contained low bacteria counts and/or harmless bacteria that will not make you sick.
My driver's seat
New York City taxi seat
San Francisco restaurant seat
Hotel lobby seat
Hotel room seat
The SO-Bad Seats: These seats contained high bacteria counts, including E Coli. (The strains of E. coli we found are not the deadly type, but are an indicator of the presence of fecal matter.)
Movie theater seat
Airport lounge seat
Rental car seat
How to Handle Germs on Public Seats
When we tested a dozen different kinds of public seats on a trip from Washington, D.C. to San Francisco, we discovered that more than half contained traces of fecal matter and nearly a third were positive for E. coli. That raises some universal questions.
Q: How can I prevent illness from the germs on public seats?
A: Luckily, we don't lick seats. We sit on seats, so the real cross contamination point is our hands. For that, the solution is simple: Wash your hands thoroughly after you sit in a public seat, especially before eating. If you don't have access to soap and water, an alcohol-based hand sanitizer solution is effective in killing germs.
Q: What about if my clothing or my bag touch public seats?
A: It's a good idea to avoid sitting on your bed and anywhere else you want to keep extra clean after sitting in a public seat. And if you placed your purse or backpack on the seat, then you won't want to put it on your kitchen or bathroom counter -- or other places that you need to keep sanitary.