Ticks have arguably the most dangerous bite to humans of any species in the British Isles. Our warming climate will only make things worse as ticks become able to breed all the way through winter, and it is now not uncommon to find ticks on dogs in the winter months. Walkers and climbers are at particular risk too. Why is such a small creature so scary? Two words: Lyme disease.
Ticks are arachnids, part of the spider family. A tick may be completely harmless but many carry different diseases, from Tick-Borne Encephalitis and Rocky Mountain Spotted Tick Fever to Babesia, Q fever and Louping-ill. More recently one has been discovered in the New Forest which can cause a fatal allergic reaction to red meat. However the most well known is Lyme disease, caused by bacteria of the Borrelia type. Until recently Lyme was thought to be an import from our American cousins, but it is far more likely that we exported it to America as there is evidence of Lyme disease in 3000 year old skeletons in the Orkneys, and Otzi the Iceman in Austria was also found to have it.
At the moment around 2500 cases of Lyme disease are reported each year in the UK and it is now reportable under RIDDOR; however doctors are not obliged to report it unless it is work related, so there may be many other cases out there. One expert entomologist, Ian Burgess, Director for Insect Research and Development in Cambridge, thinks that the true figure is more like 35,000.
Although some areas in particular are flagged up as being higher risk, among them the Lake District, the New Forest, Hampshire, the North York Moors, the Scottish Highlands and Exmoor, in truth wherever there are ticks there is a risk of infection - even in urban parks such as London's Richmond Park.
1) Many people who develop the symptoms are not aware that they have been bitten by a tick in the first place.
2) The one sure sign of having Lyme disease is the 'bulls eye' rash (erythema migrans). In a perverted sort of way, you are actually lucky if you develop this as it confirms that you have Lyme disease. However less than 40% of people who have Lyme disease had a bulls eye rash to confirm.
3) The disease is still relatively little-known among medical practitioners in Britain, even in areas of high risk. As a result it is not uncommon for doctors to refuse to accept that Lyme exists in the UK, while others might insist that you cannot possibly have it unless you also have the textbook bull's eye rash. Anecdotally, friends of ours have met with both of these reactions.
4) The blood tests for Lyme disease may not show any sign until the body produces some antibodies to the disease, by which time it may already have taken hold.
5) The signs and symptoms are so variable, and may take different lengths of time to appear, that people may not associate them with a tick bite many months ago. There is disagreement from experts on the incubation period for Lyme disease, with quotes of anything from three days to up to six months.
So as you can see there are many signs and symptoms, and different people get different ones. This may be because Lyme disease is thought to supress the immune system, so if someone is exposed to a certain virus whilst being infected with Lyme disease, those are the symptoms which develop.
Removing a tick
It is thought that so long as you don't distress a tick it is reasonably safe for about the first 24 hours of attachment, because to begin with it just feeds. Only when it has digested and taken on board food (your blood) does it start to get rid of waste products (including any disease it carries) into your bloodstream.
On a positive note, there is now a vaccination for dogs against Lyme disease which suggests one may become available to humans in the next few years.
As a postscript, (and a more negative note) there is also a belief that ticks are not the only way that Lyme Disease is spread. There is a theory, as yet just a theory, that mosquitos and midges may also spread the disease.
Helen runs Snowdonia First Aid with her husband Steve.
Each have over twenty years of Scottish winters and are qualified Winter and International Mountain Leaders. They run Outdoor First Aid courses and Mountain Leader Training and Assessments as well as mountain and hill skills courses. This winter Helen and Steve are running Winter Skills courses both in Snowdonia and Scotland.
Helen is also a qualified Mountain Rescue Dog handler who has trained three SARDA dogs. Both she and Steve are active members of Llanberis Mountain Rescue Team and have served on the Medical and Training Sub committees running some of the team's winter training.
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