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And I'm Renée Montagne. It's too early to know if this flu season will break any records, although it feels like it about right now. It did start earlier than usual and this month it took off like a wildfire in most areas of the country. But not every respiratory illness out there is influenza. There's a nasty stomach bug too. NPR's Richard Knox reports on other viruses contributing to this winter's misery.

RICHARD KNOX, BYLINE: Things have eased off a bit in the emergency room at MetroWest Medical Center in Framingham, Massachusetts. The corridors are no longer jammed with coughing, shivering, feverish patients the way they were last week. So, Dr. Beth Zeeman could stop for a chat. She says she can spot a case of influenza from 20 paces. But not everybody who's getting sick right now has got it.

DR. BETH ZEEMAN: People think they've had the flu when they've had colds and they say they have the flu. People use the word flu for everything. But having influenza is really a different thing. It hits you like a ton of bricks.

KNOX: The other day she saw a strapping 20-year-old man who thought he was going to die.

ZEEMAN: People who are strong, healthy people are really knocked down by this flu.

KNOX: Although all respiratory infections are alike to some degree, infectious disease specialist Andrew Pavia says flu has certain hallmarks.

ANDREW PAVIA: Classic case of flu starts off suddenly, with high fever, maybe shaking chills, severe muscle and body aches. It's not uncommon for people to say their hair hurts, they hurt so badly.

KNOX: Pavia works at the University of Utah in Salt Lake City. He says influenza is part of a triple whammy of respiratory viruses hitting the country right now. Another one is called respiratory syncytial virus, or RSV.

PAVIA: There's a great deal of RSV circulating right now. And RSV causes pretty severe respiratory disease in children, particularly younger children under about two. It's pretty common for them to be hospitalized with wheezing and shortness of breath.

KNOX: And then there's para-influenza virus. Although it has influenza in its name, it's a different bug altogether.

PAVIA: It most commonly causes croup - that kind of barky cough that children get. But in adults it can cause laryngitis and a prolonged cough.

KNOX: But the regular old flu is the first among equals when it comes to respiratory miseries.

PAVIA: Flu reliably kills people every year. It kills healthy people as well as the very young, the very old and debilitated people. So I still treat flu with the greatest degree of respect.

KNOX: There's a fourth virus making some Americans sick right now - the nasty norovirus. Some people call it stomach flu, but it really doesn't have anything to do with the flu. Its specialty is intestinal - causing non-stop diarrhea and what doctors call projectile vomiting.

That can quickly lead to a dangerous level of dehydration. Norovirus is also notorious among medical people for being so easy to get - from eating foods or touching surfaces that are contaminated - and so hard to get rid of.

PAVIA: It requires cleaning, cleaning and then cleaning again, in order to remove norovirus from environmental surfaces.

KNOX: By comparison, the influenza virus is a pushover, environmentally speaking.

PAVIA: It doesn't survive very well in soft environments like tissues. But it can last up to 12 hours on hard surfaces like counters under ideal conditions.

KNOX: That means you probably can pick up flu viruses from touching doorknobs or sink faucets, or using a keyboard that somebody with contaminated fingers just typed on. But most likely, you're going to get the flu by shaking hands with somebody who's infected and may or may not be showing symptoms yet.

Or by being coughed or sneezed on. That's why public health people keep harping on coughing or sneezing into your sleeve to avoid spraying virus on people nearby. And washing you hands often - silently singing "happy birthday" to yourself twice to make sure you're doing a good job.

Those things do work. And if they don't, pay attention to the kind of symptoms you get when you get sick.

PAVIA: If you're having chills that are so bad that your teeth are chattering and the chair is shaking under you, you're pretty sick. And if it's not flu, it's probably a serious bacterial infection and it's a pretty good indication you should see a doctor.

KNOX: But in January of 2013, Pavia says if you've got those symptoms, there's an 80 percent chance you've got the flu. Richard Knox, NPR News.

INSKEEP: (singing) Happy Birthday...

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