Ticks wait on vegetation and climb on when you brush past; they do not jump or fly. So prevention is mostly about the edges — where lawn meets woods, where trouser meets sock, where the walk ends and the shower starts. Treated clothing, an EPA-registered repellent with a named active ingredient, a check within two hours of coming in, and a hot dry cycle for the clothes you wore cover most of it. Pets carry ticks in, so a household with a dog should ask the vet about a preventive. And when a tick does attach, taking it off correctly — tweezers, straight up, no squeezing — matters as much as anything above.
Yard sprays work on ticks and on everything else in the yard. The evidence that spraying lowers human illness is thin; the evidence that it lowers pollinators is not.
- 1. Petsa vet-prescribed preventive · protects the dog; how much it protects people is not knownunresolved
- 2. Clothingpermethrin-treated · trousers tucked into socksproven
- 3. Skinan EPA-registered repellent with an active ingredient CDC lists — DEET, picaridin, IR3535, OLE, PMD or 2-undecanone · CDC: do not use products containing OLE or PMD on children under 3 years old · follow the product labelproven
- 4. The checkwithin two hours of coming in · warm creases · hairlineproven
- 5. Yard edgeclear leaf litter · mow · a wood-chip barrierpromising
- 6. Yard spraysacaricide · fewer ticks · a cost to pollinatorsunresolved
If a tick is attached right now
This block is first on purpose. Most people arrive here mid-problem, and removal technique is where avoidable harm happens.
Use fine-tipped tweezers, not fingers
Grasp the tick as close to the skin as you can get. Pointed tweezers work far better than the flat household kind, which tend to squeeze the body.
Pull straight up, slow and steady
Even pressure, straight out. Do not twist or jerk — that is what breaks the mouthparts off in the skin.
If mouthparts stay behind, leave them
Try to lift them out with the tweezers, and if they will not come, leave them and let the skin heal. Digging around causes more trauma than the fragment does.
Clean the bite and your hands
Soap and water, or rubbing alcohol. Nothing more complicated is needed.
Save the tick and write down the date
Sealed bag, a scrap of damp paper towel, the date and where on your body it was attached. It can be tested, and the date is what tells a clinician whether a later blood test means anything.
When to be careful
The stages are drawn at their true size below.
When ticks are active
- Months a stage is active
- Nymph — the stage this drawing is about
CDC: “From April through July, nymphs are actively questing for hosts in the environment, and in early spring and fall seasons, adults are most active.”
Source: CDC, How Lyme Disease Spreads (opens in a new tab), read 12 October 2026.
Northeast and upper Midwest pattern. Timing shifts by region and by year, so read the months as orientation rather than as a local calendar — a month outside a stage's range is not a month with no ticks.
Life-stage seasonality for the blacklegged tick (Ixodes scapularis) in the Northeast and upper Midwest: US Centers for Disease Control and Prevention. Months are approximate and shift by region and by year; nothing on this drawing is a measured quantity.
Three life stages, drawn to one scale.
CDC: “In general, adult ticks are approximately the size of a sesame seed and nymphal ticks are approximately the size of a poppy seed.”
The seeds beside the nymph and the adult are drawn at the same scale as the ticks.
Silhouettes for scale only — not an identification aid. Size varies by species and sex, and a tick that has already fed is larger than any of these.
Life stages and seed sizes: US Centers for Disease Control and Prevention, How Lyme Disease Spreads, read 12 October 2026. The three silhouettes and the two seeds are drawn to one scale; no absolute measurement is shown.
The household’s own early warning
Pets carry ticks in. A dog on veterinary prevention brings fewer of them, and a dog’s annual tick screen is information about where the household lives, not only about the dog.
What a positive dog test can and cannot say
A routine C6 antibody test at the annual vet visit.
- The household — the dog and the people in it
- What the result is about: the ground around it
A dog and the people it lives with walk the same ground. A positive result is a fact about that ground, arrived at without anyone having had to notice anything.
Nothing here is a result for a person. What it gives you is one sentence worth saying out loud at your next appointment.
It says nothing about whether any person is infected. Dogs are tested yearly, stay close to home, and cannot hide symptoms.
Orientation only. Nothing on this drawing is a measurement — there is no rate here, no timeframe and no dose. It says what the alert itself says: where ticks are, never what anyone has. We test the real alert against that same limit before changes are merged.
What actually works
Each product below carries an evidence grade in the three words the graphic near the top of this page uses — proven, promising, unresolved. The cards that are routines rather than products carry none. Effectiveness varies with concentration and how thoroughly a product is applied — the best repellent is the one you will actually use properly.
DEET
CDC Recommended · On Skin
Evidence
proven
An active ingredient CDC lists for tick and mosquito repellents, registered with EPA. Concentration changes how long one application keeps working, not how well it works while it lasts. The ages a given product is approved for, and what it says about pregnancy, are on its label.
- Best For
- All-day outdoor activities
- Reapply
- As the label states — it depends on the concentration
Picaridin (Icaridin)
CDC Recommended · On Skin
Evidence
proven
A synthetic repellent CDC lists alongside DEET. Odourless, non-greasy, and it does not damage plastics or fabrics. Published comparisons between the two measure repellency in laboratory conditions; they cannot separate that from how a product behaves on a person over a day outdoors, or from how thoroughly either one gets put on.
- Best For
- Everyday use, children
- Reapply
- As the label states — it depends on the concentration
Oil of Lemon Eucalyptus (OLE/PMD)
CDC Recommended · Plant-Based
Evidence
proven
One of the six active ingredients CDC lists for tick repellents, and one of two derived from plants (2-undecanone is the other). OLE — also sold as PMD, the synthesized form — is registered with EPA. Important: it is not the same thing as pure lemon eucalyptus essential oil, which is unformulated, unregistered, and not what CDC lists. CDC: "Do not use products containing OLE or PMD on children under 3 years old." Follow the product label.
- Best For
- Chemical-sensitive adults
- Reapply
- As the label states — it depends on the concentration
IR3535
CDC Recommended · On Skin
Evidence
proven
A synthetic repellent registered with EPA and in use in Europe for decades; it turns up most often in combined sunscreen-and-repellent products. Tick-specific head-to-head data is thinner than for DEET or picaridin, and what exists measures laboratory repellency rather than whether anyone got ill.
- Best For
- Beach/water activities
- Reapply
- As the label states — it depends on the concentration
Permethrin Clothing Spray
On Clothing Only — NOT Skin
Evidence
proven
Sprayed onto fabric, never onto skin. Boots, socks, trousers, tent fabric. Let it dry completely before wearing — hang it in a garage overnight. It is an insecticide: keep cats away from treated fabric until it is dry, and follow the label.
- Apply to
- Boots, socks, pants, tent
- Lasts
- The washes stated on the label
Factory-Treated Permethrin Clothing
Pretreated · Long Duration
Evidence
proven
Clothing treated with permethrin at the factory holds its protection through many more washes than a spray-on treatment; each label states how many. It costs more upfront and less per wash.
- Best For
- Frequent outdoor exposure
- Lasts
- The washes stated on the label
Clothing Choices That Help
No cost · Immediate effect
Evidence
proven
Light colours make a tick easier to see against the fabric. Long sleeves and long trousers give it less skin to find. Tucking trousers into socks turns the easiest route up a leg into a climb across cloth, in full view.
- Cost
- Free — clothing you own
- What it does
- Slows a tick down and keeps it visible
Tumble Dry Your Clothes First
Post-Exposure · No cost
Evidence
promising
Ticks die when they dry out, and a hot tumble dryer is the driest place in the house. CDC's routine is to tumble dry the clothes you wore on high heat before washing them; a cold or warm wash does not kill ticks.
- When
- Straight after time outdoors
- Dryer
- High heat — CDC publishes how long
Yard Landscaping Changes
Permanent · No chemicals
Evidence
promising
Clearing leaf litter, mowing, and a wood-chip or gravel strip where lawn meets woods make that edge drier and less hospitable to ticks. Tick counts fall at a managed edge; what that does to how often the people in the house get ill has not been measured.
- Lasts
- Permanent with maintenance
DIY Permethrin Yard Spray
Acaricide · Applied at the yard edge
Evidence
unresolved
A permethrin concentrate put on with a hose-end sprayer, concentrated where lawn meets woods rather than across the whole lawn — that edge is where most encounters happen. Mixing rate, timing and re-application are on the product label, and the label is the instruction, not this page. It kills more than ticks, which is the trade the page names.
- Where
- The lawn–woods edge, not the whole lawn
- Evidence
- Fewer ticks; a large randomised trial found no fewer illnesses
Professional Yard Treatment
Commercial Acaricide · Applied by a service
Evidence
unresolved
A licensed applicator sprays a commercial acaricide, usually along the wooded edge. The same trade applies as the DIY version and so does the same open question: treated yards hold fewer ticks, and a large randomised trial found no fewer illnesses among the people living in them.
- Evidence
- Fewer ticks; no fewer illnesses in the large trial
Natural / Low-Chemical Yard Options
Reduced toxicity · Plant-derived acaricides
Evidence
unresolved
Plant-oil acaricides — rosemary, cedar and similar — for households that would rather not put a synthetic pesticide near children or pets. They have been tested against tick counts far less than permethrin has, and the comparisons that do exist cannot separate the product from how much of it went down, how often, and how carefully.
- Best For
- Chemical-sensitive households
- Supplement with
- Landscaping changes
Oral Isoxazolines — NexGard, Bravecto, Simparica, Credelio
Prescription · Dogs only · Systemic
Evidence
proven
Prescription chewables for dogs. The active ingredient circulates in the dog's blood, so it acts on ticks that have already bitten rather than keeping them off the coat. Nothing sits on the fur, and swimming or bathing does not wash it off. Which one suits a particular dog is a veterinary decision.
- Species
- Dogs only
- Label interval
- 1 month (NexGard) · 3 months (Bravecto)
Seresto Collar
Dogs & cats · Repels and kills · Collar
Evidence
proven
A collar that releases imidacloprid and flumethrin across the coat, so it both repels ticks and kills ones that attach. Its label states eight months from a single collar. It has to stay in contact with the skin to do anything at all. The dog and cat versions are separate products, not one cut down.
- Species
- Dogs AND Cats (separate products)
- Label interval
- 8 months from one collar
Permethrin Topicals — K9 Advantix II, Vectra 3D
Dogs only · Repels and prevents attachment
Evidence
proven
Spot-on topicals containing permethrin, applied to the dog's skin. They repel ticks and prevent attachment rather than acting through the blood. Permethrin is toxic to cats, so a treated dog sharing a house with a cat is a conversation to have with the vet before the first application.
- Species
- Dogs ONLY — toxic to cats
- Label interval
- Monthly
Annual IDEXX 4Dx Plus Testing
Detection · A signal about the household · At the annual vet visit
One blood sample screens a dog for Lyme (C6 antibody), Ehrlichia, Anaplasmosis and Heartworm. A positive C6 result is evidence of ticks carrying Lyme where you live. It says nothing about whether any person in your household has been infected — a pet's test is not a diagnosis for a human. It is worth mentioning to your own clinician.
- When
- At the annual vet visit
The Post-Exposure Protocol
CDC routine · Coming in from outside
Evidence
proven
CDC's routine for coming in from tick habitat: shower within two hours, do a full-body check, and tumble dry the clothes you wore. Showering rinses off ticks that have not attached yet, and undressing is the moment a full-body check is actually easy to do.
- When
- Within 2 hours of coming inside (CDC)
- Look at
- Warm creases, hairline, waistband, behind the knees
Found a Tick — Remove It Correctly
Immediately on Discovery
How you take a tick off matters. Squeezing the body — or burning it, or smothering it — can push its stomach contents into the bite. The steps are at the top of this page.
- Tool needed
- Fine-tipped tweezers
- After removal
- Bag it, and write down the date and where on the body
Submit Your Tick for Testing
After Any Tick Bite
Some laboratories will test a removed tick for the organisms it was carrying, usually for a fee, and some state agencies test ticks for their own residents. What the tick carried is information for your clinician and tells you what to watch for. Results arrive after the decisions that are made soonest.
- Cost
- Usually a fee — ask the laboratory
Whether treating a yard with acaricide lowers human infection is unresolved — a large randomised trial found fewer ticks and no fewer illnesses. We do not know how much of a dog's preventive protects the people in the house, only that a protected dog carries fewer ticks in.
- Which tick preventive is right for our dog?
- Is permethrin clothing sensible for a child who plays at the woodland edge?
- After a high-risk bite, would you offer preventive treatment — and how soon do you need to hear from me?
Review statePending clinical review
Repellent active ingredients, the treated-clothing guidance, and the tick-removal procedure. A clinically-informed reviewer has not yet signed this off, and it stays marked until one does.