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Tick Test & Prophylaxis Proof.


- candidate number14729
- NTR NumberNTR3953
- ISRCTNISRCTN wordt niet meer aangevraagd.
- Date ISRCTN created
- date ISRCTN requested
- Date Registered NTR18-apr-2013
- Secondary IDsNL42713.094.12 / 2012-005101-51 / V/330564/01; CCMO / METC / RIVM
- Public TitleTick Test & Prophylaxis Proof.
- Scientific TitleTick Test & Prophylaxis Proof.
- ACRONYMTT&PP
- hypothesisAntibiotic prophylaxis reduces the risk of Lyme disease after a tick bite in the Dutch setting, in relation to tick infection, tick engorgement and attachment time.
- Healt Condition(s) or Problem(s) studiedLyme, Prophylaxis, Antibiotics, Tick bite
- Inclusion criteria1. 8 yrs and older;
2. Not pregnant;
3. Report a recent tick bite on the webportal Tekenradar.nl – i.e. at the moment of inclusion they are able to take prophylaxis within 72 hrs after removal of the tick;
4. Willing to send the tick to the RIVM.
- Exclusion criteria1. Not able to give informed consent or do not have a thorough command of the Dutch language;
2. Report other tick bites in the three months before inclusion;
3. Contra-indication for treatment with doxycycline (including pregnancy and earlier allergic reactions to tetracyclines);
4. Not able to take prophylaxis within 72 hours after removal of the tick at the moment inclusion.
- mec approval receivedyes
- multicenter trialno
- randomisedyes
- masking/blindingNone
- controlNot applicable
- groupParallel
- Type2 or more arms, randomized
- Studytypeintervention
- planned startdate 1-apr-2013
- planned closingdate1-apr-2018
- Target number of participants2500
- InterventionsA single dose of 200 mg doxycycline for adults and children > 8 years and older (if body weight < 50 kg, the dose is adjusted to 4 mg/kg body weight) within 72 hours after tick removal.

The control group receives no treatment.
- Primary outcomeEfficacy of prophylaxis, i.e. the relative risk (RR) reduction for developing Lyme disease after a tick bite and the Number Needed to Treat (NNT) to prevent one case of Lyme disease. The tick screening results will be used to assess the reduction in NNT when only prescribing prophylaxis if the tick is infected and the engorgement or attachment time are above a certain threshold.
- Secondary outcomeThe number of participants that develop Adverse Events in the month after taking the prophylaxis. Scores for epidemiological risk factors for acquiring tick bites and developing Lyme disease such as exposure to ticks in daily life, participants’ activities when acquiring the tick bite, area of acquiring the tick bite, prevention of tick bites. Differences in NNT for children and adults.
- TimepointsAfter 1 week, 1 month, and every 3 months up to 18 months of f.u. the subjects are requested to complete a questionnaire regarding symptoms of Lyme disease.
At week 1 and month 1 subjects in the treatment group are also asked about Adverse Events after antibiotic use.
- Trial web sitewww.Tekenradar.nl
- statusopen: patient inclusion
- CONTACT FOR PUBLIC QUERIES R.A.J. Boxtel, van
- CONTACT for SCIENTIFIC QUERIES R.A.J. Boxtel, van
- Sponsor/Initiator Rijksinstituut voor Volksgezondheid en Milieu (RIVM)
- Funding
(Source(s) of Monetary or Material Support)
ZON-MW, The Netherlands Organization for Health Research and Development
- PublicationsN/A
- Brief summaryIn the last 15 years, the number of cases of early Lyme disease in the Netherlands has tripled to 22,000 per year, posing an increasing public health burden. Antibiotic treatment of early Lyme disease is crucial as it can prevent the development of late and more severe disease stages. However, infections can initially remain undetected due to the diverse and often ambiguous nature of clinical manifestations of Lyme disease. Furthermore laboratory diagnostics are not always capable of detecting an early infection.
In the US, prophylactic antibiotic treatment after a tick bite has been shown to prevent most Lyme disease. It has not been investigated whether prophylaxis is effective in the Netherlands whereas transmission dynamics regarding ticks and Borrelia species are different from the US. With 1.1 million tick bites per year the recommendation of prophylaxis would result in very large numbers of patients treated with prophylaxis.
For a future evidence-based guideline on prophylaxis, its efficacy in the Dutch setting should be investigated. It should also be investigated to what extent the NNT can be reduced by using tick-screening criteria (tick infection, tick engorgement and attachment time) to assess the risk of Lyme disease after each tick bite. If this tick-screening and subsequent preventive intervention procedure proves successful, most Lyme disease is preventable with minimal use of antibiotics.
- Main changes (audit trail)
- RECORD18-apr-2013 - 26-apr-2013


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