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I understand the concern regarding increase in numbers of syphilis cases in Belgium - there are flares of various diseases from time to time. The numbers of syphilis cases in heterosexuals across Western Europe is relatively small - when compared to the gay and bisexual populations where the numbers are high.
It is not possible, in the absence of very typical symptoms such as the appearance of a chancre - to draw any conclusion from symptoms.
The prospect of other less infectious diseases such as chlamydia and gonorrhoea is limited given the limited nature of your sexual contact.
The only reliable way to tell if you do have syphilis is to take a blood test at 4 weeks post event.
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