Unusual Tick-Borne Virus Lurks In Missouri's Woods | WAMU 88.5 - American University Radio

NPR : News

Filed Under:

Unusual Tick-Borne Virus Lurks In Missouri's Woods

Last year, scientists got the chance to solve a medical mystery — well, at least half of it. This week the final puzzle pieces fell into place, as investigators tracked the newly identified virus to an eight-legged bug.

The mystery actually began with two Missouri farmers who came down with a strange illness in 2009. They had high fevers, diarrhea and nausea. Their platelet counts dropped dramatically, though they didn't experience any abnormal bleeding.

Doctors thought it was a bacterial infection. But antibiotics didn't help. So a quick-thinking physician at Heartland Regional Medical Center in St. Joseph, Mo., sent the men's blood to the Centers for Disease Control and Prevention.

When virologists looked at the samples under the microscope, they discovered a virus that no one had ever seen before. They named it the Heartland virus, in honor of its origin and the Midwest.

Both farmers eventually recovered from the illness. But a piece of the puzzle was still missing. How did the men catch the virus? Where did it come from?

Now entomologists at the CDC have filled in the blanks. The bug specialists have identified the Heartland virus in ticks at a farm and in a park in northwest Missouri, near where the two farmers live.

"It's the first time anyone has found it in the wild, in the environment," says the study's lead author, Harry Savage. "It means the virus is yet another tick-borne disease in the U.S. — and another reason to prevent getting bit."

Both farmers had been bitten by ticks before getting sick. So Savage and his colleagues hunted for the virus in 12 locations around St. Joseph and the Missouri River. They collected more than 50,000 ticks during the summer of 2012, and even picked the bloodsuckers off horses and dogs on the patients' farms.

The virus showed up in only one species: the lone star tick. And it wasn't in the adult insects — just the young ones, called nymphs.

Near the home of one of the farmers, 1 in 500 nymphs had the virus, Savage tells Shots. "If we were looking for Lyme in Connecticut, there would be more ticks infected," he says, "but for a virus, [1 in 500] is a substantial number."

Savage and his team published their findings this week in the American Journal of Tropical Medicine and Hygiene.

The lone star tick — which is named after the white spot on its back, not Texas — doesn't carry the bacteria that causes Lyme disease. But it has been linked to a similar illness, called Southern tick-associated rash illness. And its bite can leave a rash that looks like the one caused by the Lyme-carrying deer tick.

No other cases of the Heartland virus have been reported since its discovery last year. And Savage thinks the risk of infection is still low.

"That's just speculative," he says. "With viruses, there are often a lot of people who are asymptomatic."

And, since the virus is new, health workers have probably missed it, he says. "In Missouri, doctors will think you have bacterial infection, give you antibiotics and send you home."

Savage and his team are just starting to look for the virus in other parts of the U.S. The lone star tick has a broad distribution in the U.S., occupying much of the Southeast. The tick's range has even been expanding over the past few decades, and it now thrives as far north as Maine.

Copyright 2013 NPR. To see more, visit http://www.npr.org/.

WAMU 88.5

Art Beat With Lauren Landau, July 1, 2015

You can check out work by local women artists or see a comedy about how one woman’s midlife crisis affects those around her.

WAMU 88.5

Food Packaging & Pricing

Have you ever popped open a bag of potato chips only to be disappointed by the number of crisps in your bag? It's not just you. To avoid raising prices, companies often increase their "nonfunctional slack fill" or the difference between the volume of product and its container. We talk about how food packaging affects your recipe and wallet.

WAMU 88.5

Environmental Outlook: The Growing Fossil Fuel Divestment Movement

A look at the growing fossil fuel divestment movement.

NPR

USA's 'Mr. Robot,' HBO's 'Ballers' Among Picks For Best Summer TV Series

A flood of some 120 series, both new and returning, are coming to TV sets this summer. So, how to choose which ones to binge-watch by the pool? Our TV critic picks his four favorite new shows.

Leave a Comment

Help keep the conversation civil. Please refer to our Terms of Use and Code of Conduct before posting your comments.