Ticks and SFTS on Japan's Trails: Why a Summer Bite Is Not Just an Itch, and How to Prevent It

This is not a bug bite. It is a disease with a 10–30% fatality rate.

Get bitten by a mosquito or a blackfly in Japan and you get an itch. Ticks are different. The tick-borne disease that matters most here is SFTS — severe fever with thrombocytopenia syndrome — which carries a case-fatality rate of about 10–30%. There is no specific cure and no widely available vaccine; treatment is supportive. Ticks in Japan also carry Japanese spotted fever and Lyme disease. A "little bite in the summer brush" can turn, days later, into a fever that threatens your life. That is why a tick cannot be treated with the same shrug as a mosquito.

The good news is blunt: prepared properly, you can sharply lower both the chance of being bitten and the chance of it becoming serious. It comes down to three things — don't get bitten, remove it correctly if you are, and watch for fever for two weeks afterward. Here is each, concretely, for hiking in Japan.

Why a tick is not "just a bug bite"

A tick is not a mosquito that stabs, drinks, and leaves. It drives its mouthparts into your skin and feeds slowly over several days, and during that time it can transfer viruses and bacteria from its body into yours. Its danger is its performance as a courier:

• SFTS (severe fever with thrombocytopenia syndrome): after an incubation of 6 days to 2 weeks, fever over 38°C with vomiting, diarrhoea, and abdominal symptoms. Fatality 10–30%, no specific treatment. Most reported cases are in western Japan, but the range is expanding.
• Japanese spotted fever: fever, rash, and a bite eschar. Needs early antibiotic treatment; delay worsens it.
• Lyme disease: a spreading ring-shaped rash (erythema migrans) around the bite is the classic sign.

Where they are: grassy clearings, bamboo grass (sasa), forest edges, animal trails — and the more deer and wild boar in an area, the more ticks. When: active from spring through autumn, peaking in the warm months. Bushwhacking off-trail or resting in tall grass on a summer low mountain walks you straight into their ambush zone.

So the target is clear: reduce bare skin, and stay out of the brush. And, if bitten, don't panic.

Not getting bitten: cover skin, repellent, and treat your clothing

The basics are unglamorous and effective. Wear long sleeves and long trousers, cover your neck, and reduce exposed skin. Light-coloured clothing makes a crawling tick (a tiny black-to-reddish dot) easier to spot. Tuck your shirt into your trousers and your trouser hems into your socks to physically close the entry points.

Over that, add the chemical layer. Put a DEET or picaridin repellent on exposed skin, and a clothing-grade repellent on your clothes, trouser hems, and boots. Ticks climb up your clothing, so treating the fabric — not just skin — is what counts. For children or sensitive skin, picaridin formulas have no age limit and are low-irritation. Both a skin repellent and a clothing-grade spray (look for one labelled for ticks, madani) are easy to pick up at any Japanese drugstore before your hike.

Walking and the post-hike check: finding it early is the whole game

A tick takes 5–30 minutes after reaching your skin to cement its mouthparts in place. Which means: find it before it attaches and you can simply brush it off, harmlessly. Early detection is safety.

• Walk down the middle of the trail. Don't brush against grass, bamboo grass, or leaf-littered paths.
• Wear light colours so an attached tick stands out against the fabric.
• Glance over yourself often and flick off any tick crawling on your legs or pack before it settles.
• Full-body check after the hike, and again at your lodging. Ticks prefer soft skin: armpits, behind the knees, groin, nape, hairline, behind the ears. A shower is the easiest time to find them.
• Check your dog too, if you hiked with one.

A tick that is still walking — not yet attached — is no problem at all once you remove it. The danger is failing to notice an attached one and letting it feed for days.

If you are bitten: never pinch and pull

The single worst thing to do with an attached tick is to notice it, panic, and grab the body with fingers or tweezers and pull. The reason is structural: a tick's mouthparts are locked into your skin with a cement-like substance. Pull on the body and the head tears off, leaving the mouthparts embedded — and those retained parts are rich in pathogens and can cause a lump or abscess. Squeezing or crushing the body can also push the tick's (pathogen-laden) fluids back into you.

Correct removal, in order of preference:

1. Best: have it removed at a dermatology or plastic-surgery clinic. Excising the bitten skin under local anaesthetic is the most reliable option and avoids both retained mouthparts and fluid backflow. Japan has dermatology clinics in most towns; if you can see one soon after the hike, don't force it out yourself.
2. Petroleum-jelly method (low-stress self-care): cover the attached tick thickly with petroleum jelly for about 30 minutes; deprived of air, it often detaches on its own. Useful at a mountain hut or back at your lodging when a clinic isn't reachable. Clean the wound afterward.
3. A dedicated tool: slide a tick-removal tool between the mouthparts and skin and turn, don't pinch, to lift it out whole. If you must use fine tweezers, grip at the very base of the mouthparts, not the body, and pull straight out, perpendicular to the skin. Never squeeze, pull, crush, or twist the body — it tears and the fluids back up.

After removal: rinse with running water and keep it clean. Keep the tick — it helps identify the species and explain the bite to a doctor. Don't burn it or rip it off, which both risk fluid backflow.

A twist-out tick tool (such as a Tick Twister) is cheap, weighs nothing, and is sold at outdoor shops and many pharmacies — worth carrying one in your first-aid kit for summer hikes.

The next two weeks: don't write off a fever as "summer fatigue"

The most dangerous trap is relaxing once the tick is out. SFTS incubates for 6 days to 2 weeks. If you develop a fever over 38°C, nausea, diarrhoea, or abdominal pain in the days-to-fortnight after a bite, do not dismiss it as heat exhaustion or a stomach bug — seek medical care immediately.

And the decisive detail: tell the doctor, explicitly, "I was (possibly) bitten by a tick, on this date, while hiking in this area." For tick-borne disease, that one sentence changes the initial testing and treatment. A photo of the bite or the saved tick helps even more. Remembering "actually, I did go into that brush" only after the fever starts is too late.

For overseas hikers there is one more layer: carry travel medical insurance that covers hospitalisation in Japan. SFTS treatment can mean inpatient care, and you do not want to be weighing cost against treatment in that situation.

The bottom line

Ticks carry genuinely dangerous diseases, but the plan is simple. In brushy, animal-heavy terrain keep skin covered and treat skin and clothing with repellent; if bitten, never pinch — remove it whole with a clinic or a proper tool; and don't stop there — watch for fever for two weeks and tell the doctor it was a tick bite while hiking.

The brushy summer low mountains where ticks wait also overlap with land leeches (yamabiru) and mosquitoes — build your foot-and-skin defense once and it carries across all of them. The thing to fear is not the tick itself, but walking into the brush unprotected and unaware.