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Marielle Segarra
Hey, it's Marielle. We talked about tics on the show recently. They're not my fave, but guess what? There's a little flying creature that gives them a run for their money. Let me give you a hint. You're lying in bed on a summer night drifting off to snoozeland, when you hear a high pitched whining sound right next to your ear. How did this damn mosquito get into my house? Now I'm up, the lights are on. I'm on a mosquito hunt. Because if I don't kill this thing before I fall asleep, it will feast on my blood all night and leave me with itchy bites all over my body. Seriously, I've had one Bite me on the ivory, not the face, y'.
Sammy Ramsey
All.
Marielle Segarra
And those itchy, inflamed bumps can be more than just a nuisance. In rare but real instances in the US they can lead to serious or even deadly illness. According to NASA's report on mosquito borne diseases from May, the US has seen nearly 1,500 cases of dengue fever so far this year. There are about the same number of cases of west nile virus in 2024.
Announcer
Out of all of the creatures on the planet. Mosquitoes have caused us no end of trouble. They are likely the most devastating insects that we have ever encountered.
Marielle Segarra
Sammy Ramsey is a professor of entomology at the University of Colorado, Boulder. And the thing you need to know about him is he's a bug evangelist. He thinks insects are so awesome. He goes by the nickname Dr. Bugs.
Announcer
I'm going to say something that I think a lot of people will find very surprising. I, Dr. Sammy, your friendly neighborhood entomologist, think that we should eradicate mosquitoes.
Marielle Segarra
Hey, I said it because mosquitoes are just so perfectly adapted to spread disease.
Announcer
He says they can find a human being like a homing beacon homing in on their breath and their body heat to arrive there and then have this remarkable set of needles all tucked into their face, all stitched together that allow them to pierce the human skin so effectively that oftentimes people don't even feel that they've been bitten enough to fight back and try to slap the mosquito.
Marielle Segarra
The good news is we humans have found simple, effective ways to protect ourselves from mosquitoes. So on this episode of Life Kit, reporter Andy Tagle talks all about that with Sammy and with Professor Brian Bird of Western Carolina University. They get into why some people get bitten by mosquitoes more than others, what ingredients you should look for in bug repellent, and why you've got to stop spritzing that bug spray the same way you do your perfume.
Brian Bird
First thing to know up front, takeaway 1. Mosquitoes aren't just a summertime or a weekend in the woods problem. Anywhere there's standing water, hot temperatures, and humans, mosquitoes are likely to follow. Is it just me or are there a lot more of these disease spreaders a lot more often, or is it just in my head? You know, like here where I live in San Diego? This isn't just a problem June through August or September anymore.
Announcer
Oh, it's not just you. The mosquitoes are seemingly everywhere all the time. As the climate changes around us, as we get both more rainfall as a result of climate change in a lot of areas and warmer weather, the mosquito season can persist for longer. And the rainfall is a really big part of this as well, because the only place that they can reproduce is in stagnant pools of water. And so when that water collects in tree holes after heavy rain, or discarded tires, garbage, cracks in the ground that have accumulated enough water and then have decomposing organic material in them that they can feed on, those mosquitoes are then able to lay a lot of eggs. And every year that they do really, really well, you have a larger number of mosquit emerging that spring to then start a new population.
Brian Bird
Okay, that doesn't make me feel good. But we don't have to worry about every mosquito that we come into contact with, right?
Announcer
Absolutely. You certainly don't have to worry about every mosquito. I mean, really, you only have to worry about half of them. The males are out for pollination. They are flying around sipping nectar, moving pollen from flower to flower and allowing for those flowers to set fruit and seed. Great. Good for them. Love that. The lady mosquitoes actually need the nutritive components of blood to really get the process of generating the egg yolk for their eggs going. And if they don't feed on our blood, it doesn't allow them to actually produce offspring unless they have fed on the blood of another vertebrate organism.
Brian Bird
Now, strictly speaking, you don't even have to worry about every female mosquito. There are over 3,500 mosquito species in the world, but only a small percentage of those bite humans and or carry human diseases.
Sammy Ramsey
What's important, if you notice you're getting mosquito bites it's time to do something about it.
Brian Bird
Brian Bird is a medical entomologist and professor of environmental health at Western Carolina University.
Sammy Ramsey
And spend most of my time studying mosquito borne diseases.
Brian Bird
Brian says there are a fair number of myths and misconceptions about mosquitoes out there. He's going to help us with a few for takeaway too. While the majority of mosquito bites don't pose a serious threat, there's still something you want to avoid as best you can. Especially if you're like me, someone who came to the story because you feel like you're attacked by mosquitoes 10 times more than anyone else you know. But you're wondering, is that really true? Like, are some people just more prone to getting bitten?
Sammy Ramsey
It absolutely is true. And there's all kind of sort of factors that play into that.
Brian Bird
One big factor is your smell.
Sammy Ramsey
So they'll notice how much you're breathing off. They'll detect that CO2 and then find their way closer and closer. And as they get closer, they might even cue into things like body temperature or other odorants that we give off. We give off things like lactic acid and some humans give off trace amounts of ammonia that some mosquitoes can kind of attack. Those are two sort of important what we call human odorants that mosquitoes can.
Brian Bird
Really hone into next clothing. A 2022 study found it's best to avoid wearing red and orange, likely because they most closely resemble skin tones. On the other side of the spectrum, mosquitoes weren't attracted to white, blue, green and purple. Something to consider before your next picnic. Another thing to keep in mind might be what you put in your picnic basket because there's been some research to suggest certain aspects of diet can attract mosquitoes. Specifically, researchers found that your body odor after drinking beer and eating bananas was a lot more attractive to little suckers. And I also asked about blood type, something I've long heard and blamed for being extra mosquito bite prone. But Brian didn't bite. The science on this just isn't settled.
Sammy Ramsey
He says regardless of your blood type, there's not one blood type that's 100% protective. Right. So it's not that you're going to be at 100% reduced risk for mosquito borne disease. And so I think we have other tools that would be much better ways to protect yourself than to think about your blood type.
Brian Bird
Fair enough, Brian. So let's talk about those best ways to protect yourself. The three Ds.
Sammy Ramsey
Three Ds are some of the basic mosquito protection 101, which involves drain, dress and defend.
Brian Bird
Let's learn those one by 1. Takeaway 3. Drain. Prevent mosquito populations.
Sammy Ramsey
Before they start, we really want to focus on standing water. And so if you're regularly emptying or cleaning out or covering containers that can hold water, these could be tires or buckets, toys, planters, bird baths, flower pots. The list sort of goes on. If you're regularly, maybe once a week, dumping that water or just doing a backyard inspection to make sure you're not creating any of your own problems when it comes to mosquitoes, that drain can actually reduce some of that risk in your backyard.
Brian Bird
Okay. And I'm thinking about how much water there needs to be and how, you know, how big of an area we're talking about.
Sammy Ramsey
Yeah, it doesn't take much. You know, even a small sort of, you know, coffee cup that's, you know, a third of the way full in your backyard can, you know, produce a lot of mosquitoes. And it doesn't take long. During the summer you can go from eggs to adults, certainly within a week to, you know, 10 days. And so it doesn't take long and it doesn't take much.
Brian Bird
Next up, dress. This one's about making sure you're covered by appropriate physical barriers. Takeaway 4. So if you're out camping, for example.
Announcer
Making sure that your tent is very well sealed is really helpful. But I know people who camp sometimes and all they want to do is sleep in a hammock. You can bring a mosquito net to then drape over that hammock and the mosquito net will protect you. In your home, you really need to pay attention to how well your doors are screened. If you have screen doors or screens on your windows, they don't last forever.
Brian Bird
This also means wearing protective clothing.
Sammy Ramsey
Cover your skin as much as possible. Wear clothing like long sleeve shirts and long pants that can reduce skin exposure. That's often a tough ask in the middle of the summer when mosquito biting pressure is sort of the highest. But if you have really tight feedback fitting thin clothes, especially the type of clothes we like to use when we're going for a run or working out, some species can bite through that clothing. So I think if you're wearing a little looser fitting clothes, that can add some level of protection.
Brian Bird
And if you're someone who works outdoors in bug or mosquito prone areas, Brian says it might be a good idea to go one step further.
Sammy Ramsey
Permethrin could be a sort of repellent you can use to treat clothing and gear. And it's not for the skin, but you can Apply it to your clothes and get, in some cases, long lasting through multiple washes. Protection against mosquito bites and ticks.
Brian Bird
Something to note about permethrin. The Environmental Protection Agency evaluated it for health and safety and deemed risks below levels of concern. But you definitely don't want to get it on your skin. Even brief exposure could cause irritation or burning on the spot. And accidentally ingesting it could cause dizziness, trouble breathing or vomiting. Also of note, permethrin spray is toxic to cats. So use only if needed and take care to use correctly. And that brings us to the last and seemingly most controversial D Depend takeaway five for individual defense against mosquito bites, use bug repellent. Now, after that disclaimer, this is something a lot of people understandably might feel concerned or confused about. Repellents often involve chemicals, and namely one called deet. DEET probably isn't what you're thinking it is, and we'll get into that in a second. But first, Sammy is going to explain how it works and why you want to use it. Remember in the beginning of the episode when he told us about how mosquitoes can find humans like homing beacons?
Announcer
If you think for a moment about what it is that DEET is doing for you, it provides hours and hours of consistent relief by confusing the capacity of the mosquitoes to smell you. And if they can't smell you, they can't locate you as a host. It basically camouflages your chemical scent so that you do not actually smell like a human being or a host for them.
Brian Bird
That is, if you spray enough to give yourself full coverage.
Announcer
I've seen people just kind of spritz it like cologne, like a little bit here, a little bit there, rub it together. That's not gonna help you. You want to make a sweeping motion each time you spray it so that the chemical is actually landing in very well distributed amounts across your skin instead of piling up in one area.
Brian Bird
So when used correctly, bug repellents with DEET basically act like invisibility cloaks against mosquitoes. Amazing, no? Now, let's address why you might have some concerns about deet.
Announcer
Now, DEET is something that I think I've heard from a lot of people that they're afraid of. And when I talk to them about it, they say, oh, yeah, deet it like thins eggshells and it's bad for pregnant women. And I realized after a while they weren't talking about de, they were talking about ddt briefly.
Brian Bird
Ddt, short for dichlorodiphenyltrichloroethane is an insecticide that was banned in the US back in the 70s. It was really effective at combating insect borne diseases, but it was found to do a lot more harm than good. It doesn't break down easily in the environment, causes liver tumors, and is a likely human carcinogen. DDT is a completely different thing from deet. D E E T the name DEET is a reference to the product's chemical compound, diethyltolamide. Unfortunately, DEET just sounds incredibly similar to that famously banned insecticide and also protects against pests. But that's where the similarities end. DEET has been deemed Safe by the EPA. Their last review, which was back in 2014, just FYI, didn't identify any risks to human health, non target species or the environment.
Sammy Ramsey
If it's used appropriately, DEET does not provide a health risk. Right? So sometimes people think a little is good, a lot is better. So they'll buy higher concentrations, for example, of DEET. And we know that even lower concentrations like 10% DEET or 20% DEET can last for up to about two hours or even longer. And then those higher concentrations actually last longer. It doesn't change their effectiveness.
Brian Bird
So before you buy, look at those labels and think about what you really need. If you're just heading to a neighbor's backyard barbecue for an hour or two, a lower concentration like 10% is probably the right call. But if you're say, headed to the rainforests of Borneo on a research trip, as Sammy's done before, you'll want something much stronger, maybe as high as 50 or 70% DEET. The point to underline here, not every bug spray is right for every person or scenario. The American Academy of Pediatrics, for example, says to remember anyone under two might have skin different than that of an adult or even an older child. So apply DEET sparingly when it comes to super young kids. But for most of us, when used correctly, it's effective and safe. Let's be really clear here though. There are bug spray best practices. Don't apply in enclosed spaces or under your clothes, just the exposed skin and outward facing stuff. Don't spray directly on your face. Instead spray into your hands and then rub onto your skin. Wash off your repellent with soap and water when you get back inside. And be aware there's also certain kinds of material that DEET can interact with strangely.
Announcer
Things like spandex, nylon, rayon. It can melt them. There are plastics in eyeglasses and stuff that you also don't want to get this Chemical on it can kind of goo ify them in ways that will make them look less than stellar. So do keep that in mind.
Brian Bird
Yikes. I mean should. But it's okay for your skin in the smaller concentration. I mean, it just makes me feel strange that something at a higher concentration would melt a plastic. But it is okay for my skin or like even okay for my kids skin. How does that work?
Announcer
I know how scary it sounds when someone says that this has the capacity to dissolve things like latex and so on, but I mean water has the capacity to dissolve sugars and you can drop it on a sugar cube and be like, oh my God, it just turned that into nothing. What will happen if I deposit this water on the surface of my skin? And because of the totally different chemistry of your skin, you're totally fine.
Brian Bird
If that analogy still doesn't make you feel totally comfortable with DEET products, the.
Sammy Ramsey
Good news really is there's other products. There's Picardin, there's IR3535, there's oil of lemon, eucalyptus and others that have been proven effective.
Brian Bird
Brian also shared a great online tool for this from the EPA with a very direct name. Find the repellent that is right for you. It's a little dashboard that asks how long you'll be outside, what you need protection from. Even if you're interested in a particular active ingredient, there are likely also a lot of products that aren't on the EPA's list that you might have questions about. When I told people that I was reporting on this story, the questions started flooding in. What about essential oils, citronella, candles, those little bracelets or bug spray patches I put on my kids clothes?
Sammy Ramsey
You know, there's a lot of alternative options out there. And I think the important message is that different pathogens like viruses that can cause disease. From a public health perspective, we want strong data supporting what we're going to recommend. So if they're not evidence based, we do not recommend them.
Brian Bird
Before you buy, look for the science. If a product doesn't mask your body heat or human odor entirely, don't expect it to work or at least work well enough to protect you better than draining, dressing or defending. Finally, I asked Sammy and Brian about what to do after you've been bitten. The answer? Not much takeaway. 6 less is more. So what do we do when one of these little suckers gets us?
Announcer
Calling them little suckers is the perfect way to refer to them too. That's precisely what they are.
Sammy Ramsey
The first thing I do is you know, avoid more bites, right. So it might be putting on another layer of clothes. It might be reaching for the repellent. But if I get a mosquito bite, I'm really focused mostly on just keeping that bite clean. Right. Look for signs of infection. That can be any redness or persistent swelling or pus, especially with children. They've scratched it and introduced some bacteria into that wound.
Announcer
So one thing that I do is I slap a band aid over it to kind of prevent my instincts for scratching.
Brian Bird
And then there are topical ointments you can use. Of course, hydrocortisone is a common one. Aloe vera is a good natural idea, but a lot of people have their own. Go to favorites for itch relief. I asked Sammy about a few that I'd heard. Like running your arm under hot water, slapping the area so the pain could substitute the itchiness, or even applying things like oatmeal or honey. Those last two are both safe remedies according to the Cleveland Clinic. But it might not be recommended. If you want to avoid more bug.
Announcer
Bites, there are a lot of things that you can do. Putting ice on it. If you're someone who is particularly prone to swelling or heavy reactions from mosquito bites. Not everyone reacts the same way. It's not actually the bite of the mosquito that causes your skin to turn red and swell. It's actually the saliva that they've injected and it's the response of your immune system. There's not a lot that you can do about your immune system response other than slowing it down.
Brian Bird
And when is it time to see someone about a potentially more serious disease contracted from a mosquito?
Announcer
There is no one answer to when you should be worried that you have a disease from mosquitoes because they are such effective vectors, that there are so many different diseases that they are able to spread to people, and all of them have their own sets of ailments and symptoms and so on. I will say that a lot of them have very generalized symptoms.
Sammy Ramsey
Body aches, joint aches, confusion, vomiting, any neurological symptoms. Seek healthcare. You don't want to wait.
Announcer
You know your body probably better than anybody else. It's worth going to a doctor and having that examined to determine if there is a problem there and really make sure to describe the set of circumstances. I was in Thailand for a vacation and I'm coming back and I'm just feeling kind of crummy. And I was bitten by some insects there. And not entirely sure, but that might be related to this. That can be really helpful for your physician.
Brian Bird
Okay, let's recap Takeaway one You're likely to find mosquitoes just about anywhere you can find hot temperatures, standing water and humans. They're not simply a summertime or out in the woods type pest, so takeaway 2 try to avoid being bitten in the first place. The best way to do that is. Takeaway 3 Drain, dress and defend. Start by draining standing water once a week to eliminate any potential mosquito breeding grounds nearby. Dress to protect yourself. Create physical barriers between you and mosquitoes by wearing loose fitting clothes when you go outside. Use screen doors and mosquito nets when you can, and fans and AC units can help guard from mosquitoes too. Takeaway 5 Defend your exposed skin with bug repellent. DEET is safe and effective and the preferred choice of our experts, but there are other options and different concentrations that will work best depending on your personal needs. Finally, Takeaway six When you get a mosquito bite, less is more. Keep it clean and dry. Do your best not to scratch and monitor for infection. If you feel strange or feverish after getting bitten, especially if you traveled outside the country, don't wait. Consult your doctor.
Marielle Segarra
That was Life Kit reporter Andy Tagle. For more Life Kit, check out our other episodes. We have one on composting and another on protecting yourself from ticks. You can find those@npr.org LifeKit and if you love Life Kit and want even more, subscribe to our newsletter@npr.org LifeKitnewsletter this episode of Life Kit was was produced by Sylvie Douglas. Our visuals editor is Beck Harlan and our digital editor is Malika Garib. Meghan Keane is our senior supervising editor and Beth Donovan is our executive producer. Our production team also includes Claire Marie Schneider and Margaret Serino. Engineering support comes from Simon Laszlo Jansen and Tiffany Vera Castro. I'm Mariel Segarra. Thanks for listening.
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Brian Bird
Please take a stand for public media today@goacpr.org thank you. @ Planet Money, we know that economic.
Sammy Ramsey
Jargon can sometimes feel like speaking another language.
Brian Bird
Yeah, like arbitrage, Alpha, Otarchy.
Sammy Ramsey
That's just what's in the news these days. There's also absolute advantage.
Brian Bird
Aggregate demand, aggregate supply. And this is just the A's.
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Brian Bird
That's a pretty good one. Planet Money from npr, we help you translate the economy so you can understand the world wherever you get your podcasts.
Sammy Ramsey
You know, those things you shout at.
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Sammy Ramsey
On NPR's Wait, Wait, don't tell me. We actually say those things on the radio and on the podcast. We're rude across all media. We think the news can take it. Listen to NPR's Wait, Wait, don't tell me.
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Life Kit Podcast Episode Summary: "How to Avoid Mosquito Bites"
Release Date: July 8, 2025
Host: Marielle Segarra
Guests:
In the July 8, 2025 episode of NPR's Life Kit, host Marielle Segarra delves into the persistent nuisance of mosquito bites and the serious health risks they pose. Drawing listeners in with a relatable scenario of a sleepless night due to a pesky mosquito, Segarra sets the stage for an informative discussion aimed at equipping listeners with effective strategies to prevent mosquito bites and mitigate their impact.
Segarra begins by highlighting the dual threat mosquitoes pose: not only do their bites cause itchy, inflamed bumps, but they can also transmit serious diseases. Referencing NASA's report, she notes, "the US has seen nearly 1,500 cases of dengue fever so far this year" alongside similar numbers for West Nile virus (01:00). This establishes the urgency of addressing mosquito populations and protecting oneself from their bites.
Quote:
"They're likely the most devastating insects that we have ever encountered." — Announcer (01:22)
Sammy Ramsey, affectionately known as Dr. Bugs, expresses a controversial viewpoint: advocating for the eradication of mosquitoes. He explains, "mosquitoes are just so perfectly adapted to spread disease" (01:58), underscoring their efficiency as disease vectors.
Dr. Brian Bird adds depth to this perspective by explaining mosquito lifecycle and environmental factors contributing to their proliferation. He observes, "a lot of these disease spreaders a lot more often... this isn't just a problem June through August or September anymore" (03:26), attributing the extended mosquito season to climate change, increased rainfall, and warmer temperatures which create ideal breeding grounds.
Bird and Ramsey explore the reasons certain individuals attract more mosquitoes. Dr. Bird points to various human odorants, such as CO₂, lactic acid, and trace amounts of ammonia, which mosquitoes detect to locate their hosts (06:03). Additionally, clothing color plays a role; a 2022 study indicated that mosquitoes are less attracted to colors like white, blue, green, and purple, while red and orange are more enticing (06:30).
Ramsey confirms the variability in bite susceptibility, stating, "It's absolutely true. And there's all kind of sort of factors that play into that." (05:58). He also debunks the myth linking blood type to mosquito attraction, emphasizing that no blood type offers complete protection.
The podcast outlines a comprehensive approach to preventing mosquito bites through the "Three Ds":
Drain
Dress
Defend
Quote:
"Three Ds are some of the basic mosquito protection 101, which involves drain, dress and defend." — Ramsey (07:45)
A significant portion of the episode is dedicated to understanding and addressing concerns about DEET, the most recommended bug repellent:
How DEET Works:
DEET confuses mosquitoes by masking human scents, effectively acting as an "invisibility cloak."
Quote:
"If they can't smell you, they can't locate you as a host." — Announcer (11:36)
Safety of DEET:
Contrary to common misconceptions, DEET is distinct from the banned insecticide DDT. The EPA has deemed DEET safe when used as directed (13:46). However, care must be taken to avoid over-application and contact with certain materials.
Proper Application:
Apply DEET in sweeping motions for even coverage, avoiding enclosed spaces, under clothing, and direct face application. For children under two, use lower concentrations as advised by the American Academy of Pediatrics.
Alternatives to DEET:
For those uncomfortable with DEET, alternatives like Picardin, IR3535, and natural options such as oil of lemon eucalyptus are available and effective (16:21).
Quote:
"DEET is safe and effective and the preferred choice of our experts, but there are other options and different concentrations that will work best depending on your personal needs." — Dr. Brian Bird (14:11)
While prevention is key, the episode also addresses what to do if bitten:
Immediate Actions:
Avoid Scratching:
Protect bites with band-aids or other coverings to reduce the risk of infection.
Seek Medical Attention If:
Quote:
"Keep it clean and dry. Do your best not to scratch and monitor for infection. If you feel strange or feverish after getting bitten, especially if you traveled outside the country, don't wait." — Dr. Brian Bird (17:53)
Mosquito Ubiquity:
Mosquitoes thrive wherever there is standing water, warm temperatures, and human presence, making them a year-round concern in many areas.
Preventive Measures:
Implementing the Three Ds—Drain standing water, Dress appropriately, and Defend with repellents—can significantly reduce the risk of mosquito bites.
Effective Use of Repellents:
Proper application of DEET or its alternatives is crucial for maximum protection. Always follow label instructions and consider the specific needs of your environment and activities.
Post-Bite Care:
Managing bites promptly and knowing when to seek medical help can prevent complications from potential mosquito-borne diseases.
Comprehensive Summary:
"Start by draining standing water, dress to protect yourself with appropriate clothing, and defend against mosquitoes using effective repellents like DEET. If bitten, keep the area clean and monitor for any signs of infection or illness." — Dr. Brian Bird (20:27)
Marielle Segarra's episode on avoiding mosquito bites offers a thorough exploration of the challenges posed by these insects and provides actionable advice backed by entomological expertise. By understanding mosquito behavior, recognizing personal vulnerability, and employing effective prevention and management strategies, listeners are empowered to protect themselves and their communities from the nuisances and dangers associated with mosquito bites.
For more tips and insights, explore other Life Kit episodes on topics like composting and tick protection, available at npr.org/LifeKit.
Note:
This summary excludes advertisements, intros, outros, and non-content sections to focus solely on the informative aspects of the episode.
Note: Timestamps are indicative and refer to the transcript provided.