Μέλος Εταιριών:
- Ελληνική Εταιρεία Εσωτερικής Παθολογίας
- Ελληνική Εταιρεία Χημειοθεραπείας (Γραμματέας: 1982-1997 και Πρόεδρος του Δ.Σ από το 1998-σήμερα).
- Ελληνική Εταιρεία Μελέτης και Αντιμετώπισης του AIDS
- Ελληνική Εταιρεία Λοιμώξεων (Founder and Past President 1993- 1996).
- Association “Friends of Institute Pasteur”.
- International Society of Chemotherapy (Μέλος: 1989-1993). Τιμητικό Μέλος από 2011
- British Society for Antimicrobial Chemotherapy
- European Society for Clinical Microbiology and Infectious Diseases (ESCMID)
- Infectious Diseases Society of America (IDSA)
- Hospital Infection Society (UK)
- E. O. R. T. C.: European Organization for Research on Treatment of Cancer.
- ISGAR: International Society Group on Antimicrobial Resistance.
- International Immunocompromised Host Society.
- International Society for Anaerobic Bacteria.
- Alliance for the Prudent of Use of Antibiotics (APUA).
- New York Academy of Sciences.
- Surgical Infection Society Europe.
- F. E. S. C. I. (Federation of European Society of Chemotherapy and
- Infectious Diseases) (President 2003-2007).
- ICE (International Collaboration Endocarditis): Duke University, Durham, USA.
- Ιδρυτικό Μέλος και Τιμητικό Μέλος του ESCMID Study Group στις “Λοιμώ-ξεις σε βαρέως πάσχοντες ασθενείς” (2011-present)
Μέλος Συντακτικών Επιτροπών (Editorial Board) Ιατρικών Περιοδικών και Κριτής Εργασιών (Reviewer):
- Clinical Infectious Diseases (USA).
- Infectious Disease Practice for the Clinician (USA).
- Clinical Microbiology and Infection. (ESCMID- Switzerland)
- Infectious Diseases in Clinical Practice (USA).
- European Journal of Clinical in Clinical Microbiology and Infectious Diseases (Germany).
- Drugs (New Zealand).
- Drug Investigation.
- Journal of Chemotherapy
- Revista Espaniola di Quimioterapia (Spain).
- American Journal of Clinical Dermatology. (USA)
- Lancet Infections Diseases. (UK)
- Journal of infection (UK).
- Journal of Antimicrobial Chemotherapy (UK).
- Antimicrobial Agents and Chemotherapy (USA).
- Expert Opinion on Pharmacotherapy.
- Journal of Pediatric Infectious Diseases (USA).
- International Journal Antimicrobial Agents (UK).
- Intensive Care Medicine.
- Expert Opinion on Investigational Drugs.
- The Lancet
- Eurosurveillance
- Minerva Anestesiologica
- Expert Review of Anti-infective Therapy
- The Open Emergency Medicine Journal
- The Medical Letter
- Scandinavian Journal of Infectious Disease
- Saudi Journal for Health Sciences
- PLoS ONE
- Respiration (International Journal of Thoracic Medicine)