Jeremy Siegel: A rising tick population is causing a bump in cases of Lyme disease. But there’s another tick borne illness increasing across New England: Babesiosis. Joining us now for more is GBH’s Dominique Farrell. Good morning, Dominique.
Dominique Farrell: Good morning Jeremy.
Siegel: So what is babesiosis?
Farrell: Yeah, it’s a rare infectious disease transmitted by the bite of a blacklegged tick, which is more commonly known as the deer tick. And it’s infected with the parasite babesia microti. And what it does is it infects and destroys red blood cells. So for most people who get babesiosis, they won’t even know they have it or they’ll only develop mild flu-like symptoms. But in severe cases, it can lead to organ failure and even death. Now, this is different than Lyme disease where you won’t die from Lyme disease. And also the same tick, the deer tick, carries both babesiosis and Lyme disease. And that same tick, one tick, can carry both at the same time. And those most at risk of contracting severe babesiosis are people over the age of 50, those without a spleen, and immunocompromised individuals. So it’s really important that we catch it early and treat it.
Siegel: This illness is on the rise. Give us a little more context about that. How much more prevalent is it than it used to be?
Farrell: Well, it’s been around for a while. The first reported case in the U.S. was back in 1969 on Nantucket. But in the past decade or so, according to the CDC, the cases have been increasing in northern New England. And it’s now endemic, meaning it’s consistently found in all New England states and News York. And I wanted to understand why we’re seeing such a sharp increase. So I spoke with Doctor Cassandra Pierre, and she’s an epidemiologist at Boston Medical Center. Here’s what she had to say.
Dr. Cassandra Pierre: Partly due to climate, partly due to the fact that we have encroachment into areas that were previously wooded --- and then humans go into those places, or the vectors for those ticks come out of those places as well.
Siegel: So there are a few potential reasons for why it’s rising. You spoke with someone who has firsthand experience with this, an account of what babesiosis is like. What was their experience?
Farrell: Yeah, I spoke with Kristen Smith of Portland, Maine, and she told me that last August she developed severe flu-like symptoms. She had a high-grade fever, shortness of breath, dizziness, and her symptoms didn’t go away after a few days. So she went to the doctors, several of them, in fact. And she was diagnosed with everything from strep throat to West Nile virus and even anaplasmosis, which is another tick borne disease. But her health continued to deteriorate. So finally she went to the hospital and she was properly diagnosed with babesiosis. And Smith told me she spent a week hospitalized.
Kristen Smith: I had to have seven blood transfusions while I was in the hospital. It was quite scary. In fact, the doctor told me afterwards that I very easily could have died if I hadn’t come to the hospital that day.
Siegel: And she may not have been diagnosed if she didn’t go to the hospital in the first place. Why is this so hard to diagnose?
Farrell: Yeah, that’s a good question. More than half of the people who are diagnosed with babesiosis don’t recall being bitten by a tick. And that’s because there’s no sign, like the red ring that many people associate with Lyme disease. And in the nymph stage, the tick is the size of a poppy seed. And then those symptoms don’t appear until a few weeks after being bitten. And then often the symptoms mimic the flu. So it’s really hard to connect all those dots.
Siegel: What can we do to protect ourselves from this?
Farrell: The same with protecting yourself against Lyme disease. You want to try to avoid areas with ticks, cover exposed skin with clothing when you go outdoors, and then check yourself for ticks when you return home and use an insect repellent that works against ticks. But most importantly, Dr. Pierre said to advocate for yourself. You know, if you have symptoms, you’ve been to the doctor. Maybe you’ve even been to the emergency room, they’re not going away, especially if you fall into the high risk category --- ask for a tick panel.
Siegel: Dominic, before I let you go, the woman who you spoke with, who contracted this, Kristen Smith. How is she doing now?
Farrell: You know, it took a couple months for her to fully recover, but now she’s doing great.
Siegel: That’s GBH is Dominique Farrell. Dominique, thanks so much for your time this morning.
Farrell: Thanks, Jeremy.
Siegel: You're listening to GBH News.
Last August, Kristen Smith spent weeks seeking multiple doctors to determine the culprit behind her throbbing headache, high-grade fever and shortness of breath.
Smith, 55, of Portland, Maine was initially diagnosed with strep throat at an urgent care clinic, she said. But after a few days of taking antibiotics, Smith felt worse.
Her second diagnosis, this time West Nile Virus, was delivered by her primary care doctor, she said. She was told with rest, she’d feel better in a few days.
She didn’t.
“My breathing started to become very labored. And I had literally no energy,” said Smith. “It was almost impossible to get from my bed to the bathroom, which was like ten feet away.”
She never expected a diagnosis of babesiosis, a dangerous and potentially deadly disease transmitted by the bite of the Blacklegged tick infected with the Babesia microti parasite. That diagnosis is on the rise in New England, due to climate change and more human interactions with ticks.
Smith told GBH News she went to the emergency room at Maine Medical Center, where doctors ordered a tick panel. While they awaited its results, she said, they treated her for anaplasmosis, a bacterial infection transmitted by ticks.
Her condition rapidly deteriorating, Smith said her doctor recommended she purchase a shower chair since she could no longer muster the strength to stand.
“That’s when I really started to realize that there was something terribly wrong,” said Smith. “And that nobody knew what it was and that I had not been properly diagnosed yet.”
After two weeks without a proper diagnosis, Smith returned to the emergency department. When doctors noticed her eyes and skin were jaundiced, they admitted her. With her tick panel results back, Smith finally received her correct diagnosis: babesiosis.
Babesiosis on the rise
Although Lyme disease is the most common tickborne illness in the U.S., cases of babesiosis caused by Babesia microti are increasing across New England. The first documented human case of babesiosis caused by Babesia microti in the U.S. was reported on Nantucket in 1969. Since then, babesiosis has spread into the Northeast and upper Midwest regions of the country.
According to the CDC, babesiosis cases more than doubled from 2011 to 2019, with Maine, Vermont and New Hampshire reaching endemic levels for the first time. The disease is now found in all six New England states and in New York State, New Jersey, Minnesota and Wisconsin.
The majority of patients diagnosed with babesiosis are over the age of 50.
Dr. Edouard Vannier, an infectious disease researcher at Tufts Medical Center in Boston, said as the population ages, doctors should expect to see more patients infected with babesiosis.
“What people are not aware of is that you actually can die from babesiosis, but that you will rarely die from Lyme disease,” said Vannier.
Most people infected with babesiosis are asymptomatic or experience mild symptoms including fatigue, fever, headache and muscle aches, according to the Centers for Disease Control and Prevention, or CDC. But in severe cases, babesiosis can result in kidney failure and even death. Older adults, immunocompromised people and those without a spleen, like Smith, face a higher risk of developing a life-threatening condition.
A parasitic infection
Like malaria, the Babesia microti parasite destroys red blood cells. Because Smith doesn’t have a spleen, it caused the disease to progress more quickly than usual.
And with every misdiagnosis — of strep throat, West Nile Virus and anaplasmosis — her lifesaving treatment was delayed.
In the hospital, medical residents crowded into her room to hear about her case. A representative from the CDC arrived to tell Smith the agency would be monitoring her progress.
“I have not walked in the woods or in the grass with shorts on since this happened, and I don't think I ever will again."Kristen Smith
Smith received seven blood transfusions to increase her red blood count and was prescribed antibiotic and antiparasitic medication. After a week-long hospitalization, Smith went home to recover.
“The doctor told me that I easily could have died if I hadn’t come to the hospital when I did,” said Smith.
Prevention and treatment
Current preventative measures are limited. They include avoiding areas with ticks, wearing appropriate clothing, using insect repellents and performing tick checks.
But as the climate warms, tick season is extending and expanding, pushing the arachnids north into new territory.
“We have an increased number of cases of babesiosis here and increased geographic spread, partly due to climate and partly due to the fact that we have encroached into areas that were previously wooded,” said Dr. Cassandra Pierre, an epidemiologist at Boston Medical Center.
For people who contract babesiosis, the standard treatment is to take a combination of antiparasitic and antibiotic medications for seven to 10 days.
In rare cases, babesiosis can be transmitted from person to person through a blood transfusion. In 2019, the
FDA recommended that areas with a high prevalence of the disease screen the blood supply for the Babesia microti parasite. But as the disease spreads and people travel, Pierre said it could become a future concern for the blood supply throughout the country.
Babesiosis symptoms mimic the flu
Former GBH employee Don Goonan, who is 69, remembers feeling chilled and dizzy at work one day in December 2019.
“I had my winter coat on and I remember sort of being distracted while I was working,” said Goonan. “The next thing I know my supervisor was shaking my shoulder and saying, ‘Don’t get mad, but I called an ambulance.’”
At a nearby hospital, Goonan was diagnosed with syncope, or a common fainting spell, he said.
Days later, Goonan felt worse and visited an urgent care center in Norwell, Massachusetts. A doctor ordered a blood smear and diagnosed Goonan with babesiosis.
“You could have blown me over with a feather,” said Goonan. “I wasn’t prepared for that kind of diagnosis.”
Neither Smith nor Goonan actually ever saw a tick. But doctors say that’s not unusual.
“The ticks are so small they can have a blood meal and detach without you seeing them.”Dr. Cassandra Pierre, BMC epidemiologist
Vannier said about half of the people diagnosed with babesiosis do not recall being bitten by a tick. Most people become infected after being bitten by a juvenile tick, or a nymph — about the size of a poppy seed — which can feed without being noticed. A tick must be attached for at least 24 hours to transmit the parasite.
“The ticks are so small they can have a blood meal and detach without you seeing them,” said Pierre. “And it can be a matter of one to two to three to four weeks before you actually develop symptoms after the tick has already bitten you.”
Patients should advocate for themselves if they suspect a tick illness, Pierre said.
“If you have a fever, malaise, fatigue for a few days, you’ve been to primary care, you’ve been to the E.D. [emergency department] and the symptoms aren’t getting better, especially if you’re one of those who belong to the group of people who could be at higher risk for severe disease, ask for a tick panel,” said Pierre.
Tick testing in Massachusetts
Instead of waiting for symptoms to appear, some people have turned to independent labs like the TickReport Testing Lab in Amherst, Massachusetts. The facility claims to have tested more than 100,000 ticks since opening in 2006. Education Director Paul Killinger said most ticks are sent in from individuals who find a tick on themselves or their pet and want to know their risk of exposure to a tickborne illness before developing symptoms.
“Usually within about a day of receiving it, we’ll have tested it for up to 25 pathogens. But most of what we find is about eight main pathogens,” Killinger said.
Killinger said testing is not a substitute for a medical diagnosis, but results can help inform doctors about treatment options. Test results are entered into a database so people are able to size up their risk by state or zip code.
“Some doctors are a little bit skeptical, but I think for a lot of individuals it offers a lot of information rather than just sort of waiting,” said Killinger.
The CDC discourages using tick testing labs for diagnosis, saying results can be unreliable.
Kristen Smith, now fully recovered, is taking steps to ensure she never winds up hosting a tick again.
“I have not walked in the woods or in the grass with shorts on since this happened, and I don’t think I ever will again,” Smith said. “Just realizing what a single tick bite can do to you makes me realize that I have to take full precautions at all times.”
