 Στο 2011, ένα εξπλόστιο αδυναμό της HIV έφτασε στην Αθήνα στους αντιμετωπικούς δρακούς χρησιμοποιούς. Υπάρχει πολλή αξιότητα για να συνεχίσουμε με αυτή η επειδεμή και το Αριστοτλ's προγράμμα was designed to address this problem. Το σημαντικό της Αριστοτλς ήταν η πολύ σύντερη εκρουσία. Και για να καταλαβαίνουμε αυτή η επειδεμή, we decided to follow the path of responding driven sampling, including monetary incentives. So at the mid of 2012, the recruitment was impressive and every people coming was tested for HIV, took prevention material and the synopositives were connected with OST programs. We provided needles and also synopositives were linked to HIV care and non-diretroviral treatment. One peculiar issue of ArisTotal was that it was repeated five times. The results were impressive, in total more than 3300 intravenous drug users were enrolled. Many, many of them with repeated enrollment. At the end of the program, the incident was decreased around 78 to 80%. Also, the prevalence was stabilized from the beginning at around 16%. It was also impressive to see that injecting behaviors were improved, linked to OST double and 50% of them at the end of the program 2013 were connected also to non-diretroviral treatment. Up to today we don't have any kind of recurrence of the outbreak and we strongly believe that this program, because of the combined prevention effort, was one of the practical examples how to deal with this kind of outbreaks.