What Health Risks Do Ticks Pose to Humans?
At a Glance
- Short answer: In NH the real risks are Lyme disease, anaplasmosis, and babesiosis — plus rare but serious Powassan — all from the deer tick, and all worth taking seriously without panic.
- This is about: Ticks
- Why timing matters: attachment time drives disease risk
The short of it
In NH the real risks are Lyme disease, anaplasmosis, and babesiosis — plus rare but serious Powassan — all from the deer tick, and all worth taking seriously without panic.
The tick risk clock
NH's risk is genuinely high by national standards, but the individual math still favors most bites resolving without illness — which is why this hub grades the risk seriously and proportionately, not with alarm.
The longer it feeds, the higher the risk — so remove it early.
Lower Lyme and babesiosis risk, but Powassan and, to a lesser extent, anaplasmosis can transmit within this window.
The point at which anaplasmosis transmission becomes a real possibility.
CDC's general threshold for likely Lyme transmission — the reason prompt removal is the single best individual defense.
The Powassan exception — rare in NH (8 human cases since 2013) but the clearest reason not to rely on any 'safe window.'
What NH’s blacklegged tick can carry
- Watch for itLyme disease
The most common tick-borne disease in NH, found in all 10 counties; identified early, it's generally very treatable.
- Watch for itAnaplasmosis
A bacterial infection causing fever, headache, chills, and muscle aches, usually within about 2 weeks of the bite.
- Watch for itBabesiosis
A parasitic infection of red blood cells causing fever, chills, sweats, and fatigue; NH has seen a significant rise in reported cases in recent years.
- Rare · seriousPowassan virus
Rare — 8 confirmed NH human cases since 2013 — but can cause serious neurologic illness (encephalitis) and lacks a specific treatment, so any severe headache or confusion after a bite needs urgent evaluation.
Calibrated from: NH DHHS Tickborne Diseases; CDC; academic surveillance data
What to do about it
For people
- An expanding rash at the bite site
- Fever or chills
- Fatigue or headache
- Muscle or joint aches
- Any severe or unusual symptom (confusion, facial drooping, irregular heartbeat) in the weeks after a bite
- Don't assume every bite causes illness — most don't, especially with prompt correct removal
- Don't skip a doctor's visit just because you don't have a classic bull's-eye rash
- Don't rely on a home tick-testing kit to decide whether you need care
- Don't self-treat with leftover antibiotics or delay care while you 'wait and see' if severe symptoms appear
Contact your doctor if you develop a rash or flu-like symptoms in the days to weeks after a tick bite, and mention the bite specifically. Go to urgent or emergency care for neurologic red flags — severe headache with stiff neck, confusion, facial drooping — or cardiac/breathing symptoms.
The full picture
The NH deer tick's disease list
NH DHHS has confirmed local transmission of five tick-borne diseases, all carried by the blacklegged (deer) tick: Lyme disease, anaplasmosis, babesiosis, Borrelia miyamotoi, and Powassan virus. Lyme is by far the most common and the one most people have heard of; anaplasmosis and babesiosis are less familiar but genuinely present in NH's tick population; Powassan is rare but the most serious when it does occur, since it can cause encephalitis and has no specific antiviral treatment. Diseases like ehrlichiosis and Rocky Mountain spotted fever, which people sometimes worry about, are mainly associated with tick species found in other regions and aren't a significant local concern.
How big is the risk, really
New Hampshire is repeatedly documented as one of the highest-incidence Lyme states in the country, with over 1,300 reported cases a year for several years running, and roughly 60% of sampled NH deer ticks carry the Lyme bacterium. That's a genuinely high regional risk — but it doesn't mean every bite is dangerous. Most people bitten by a tick, even an infected one, do not go on to develop illness, and prompt correct removal meaningfully lowers the odds further. Holding both facts at once — real regional risk, and low probability from any single bite — is the honest, calibrated picture.
Attachment time isn't a safe-harbor promise
The commonly repeated rule that Lyme needs 36 to 48 hours of attachment is a useful general guide, not a guarantee. It describes typical minimums from research, and some pathogens carried by the same tick — Powassan virus, and to some extent anaplasmosis — can transmit faster. The honest takeaway is that removing a tick as soon as you find it always reduces risk, even if you can't be sure exactly how long it was attached.
The good news: these diseases are treatable
Lyme disease, anaplasmosis, and babesiosis are all generally treatable, and outcomes are best when they're caught and treated early — which is exactly why this page routes every rash or flu-like symptom to a doctor rather than encouraging readers to wait it out. The practical NH-calibrated plan is straightforward: reduce your exposure (long grass, leaf litter, tick checks), remove any attached tick immediately and correctly, and see a doctor promptly if a rash or flu-like illness shows up in the following weeks.
Key takeaways
- NH is a high-Lyme-incidence state — over 1,300 reported cases a year and roughly 60% of sampled deer ticks carrying the Lyme bacterium.
- Anaplasmosis, babesiosis, and rare Powassan virus are the other real NH deer-tick diseases; ehrlichiosis and RMSF are mainly concerns elsewhere.
- Most individual bites do not cause illness, especially with prompt correct removal — real risk, but not a reason to panic over every bite.
- See a doctor for any rash or flu-like symptoms within weeks of a bite; these diseases are generally very treatable when caught early.
Why NH grades this risk seriously
New Hampshire's blacklegged tick population is well-established in all 10 counties and most abundant in the southeast, and the state has repeatedly ranked among the highest for Lyme disease incidence nationally. That's the reason this hub treats tick-disease questions with more caution than, say, a flea remedy question — but it's still a calibrated caution, not fear-mongering. Anchor Pest Services reduces the tick population around your home and yard across Manchester, Nashua, Concord, and the surrounding towns; any actual bite or symptom is always a matter for your doctor.
We serve these communities
- NH-licensed applicator · #782664
- Same-day service
- Family-owned since 2017
Service Area Map
Southern New Hampshire
Reduce the ticks before they reduce your peace of mind
You can't control what a tick carries, but you can control how many ticks are in your yard. Anchor treats the habitat where NH deer ticks actually live.
Frequently asked questions
Sources(5)
- [1]NH DHHS — Tickborne Diseases
Five NH-confirmed tick-borne diseases; blacklegged tick vector
govverified 2026-07-14 - [2]CDC — How Lyme Disease Spreads
Blacklegged tick transmission biology and attachment-time framing
govverified 2026-07-14 - [3]CDC — Surveillance for Lyme Disease, US 2022 (MMWR)
NH listed among high-incidence Lyme jurisdictions
govverified 2026-07-14 - [4]
- [5]UNH Extension — Biology and Management of Ticks in NH
NH tick distribution and abundance
extensionverified 2026-07-14
Written & reviewed by
VerifiedDaniel Brady
NH-Licensed Pesticide Applicator · License #782664 (NHDAMF, RSA 430)
Daniel Brady is the New Hampshire–licensed applicator behind Anchor Pest Services, a family-owned pest control company serving the Manchester area since 2017.
Last updated 2026-07-14
Integrated Tick Reduction
Lower Your Exposure Where You Actually Spend Time
Anchor Pest Services treats the yard zones — tall grass edges, leaf litter, brush lines — where NH's deer tick lives and quests, reducing bite exposure for your family and pets across southern and central New Hampshire. Family-owned since 2017, NH license #782664. We never diagnose or treat illness — that's your doctor's role.
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