Welcome to Global Travel Health

Dedicated to a Higher Quality of Life


Global  Travel Health is Colorado's oldest and most highly respected source of  international travel medical consultation. For over 20 years we have  been dedicated to safer and healthier global travel. We offer  vaccinations, medications and advice for foreign travel. Weather you are  traveling for business or pleasure, you will have a one on one consultation with a experienced travel  nurse who will review your travel itinerary and medical history in  detail and advise you about any recommended vaccines, precautions or  preventive medications that will make your trip safer and more  enjoyable. One of expert physicians reviews every consultation and is  available to answer any questions that may arise during your visit. 

Global Travel Health is located at 4500 E. 9th Avenue, Suite 740  in Denver, Co. Our office is located in the Physicians Office Building  Two on the south side of 9th Ave., across the street from Rose Medical  Center. There is free parking in Rose Medical Centers parking garage.  Valet parking is also available. 

Global Travel Health is a designated Stamaril / Yellow Fever vaccination site 

Since  the maker of YF-Vax, the only yellow fever vaccine manufactured and  approved for use in the US, temporarily stopped manufacturing the  vaccine in order to update their production facilities, the only yellow  fever vaccine now available for use in the US is Stamaril, a similar  vaccine manufactured in France.  While this vaccine has been used safely  around the world for decades, it is not officially approved by the FDA,  so all recipients must be enrolled in a study to track it’s safety.   Global Travel Health is one of a few travel clinics in Colorado that  has been safely administering the vaccine within this program since the  it started, and continue to receive ample supplies from the  manufacturer.  If your travel plans involve travel to a yellow fever  endemic region, or a country that requires documentation of yellow fever  vaccination for entry, book your appointment today! "

Our clinic requires payment at time of service and does not accept  insurance . We will provide you with an itemized receipt for you to  submit to your insurance company for possible reimbursement.

About Us

Global Travel Health

can provide vaccinations for students starting college, EMT and medical students, and medical sales representatives.

Customer Service

No matter where you travel, Global Travel Health can teach you about medications and travel health care, and administer the travel shots needed to prevent illnesses and ensure Safe Travel, Good Health.  Our staff of nurses and doctors will assess your medical needs and  provide detailed advice and counseling that will help minimize  travel-related risks. 

Providers Who Care

  • Susan Robbins, R.N. 
  • Peggy Zellner, R.N. 
  • Abigail Yager, R.N. 
  • Malina Patane, 

Kenneth Greenberg, D.O., Pharm.D.

John Hammer, M.D.

Get to know the staff

Susan Robbins, R.N.

 Susan Robbins has worked for our clinic since 2004.  Her educational background includes a MBA from Regis University as well as a Bachelor of Science in Nursing from the University of Colorado.  She finds that working at Global Travel Health allows her to blend her passion for traveling with her knowledge of travel medicine.   When she’s not working, you can find her hiking, bird-watching or riding her trusty horse Kai. 

Peggy J. Zellner, R.N.

Peggy graduated with a bachelor of science in nursing from the University of Colorado. She has been with the clinic for over 22 years consulting and caring for international travelers. Peggy loves assisting clients with their unique travels and enjoys hearing  about the travel adventures and experiences from returning clients. In her free time, she is outdoors as much as possible riding her bike, walking her dogs and hiking. 

Abigail Yager, R.N.

 Abbey is a graduate from Regis University where she earned  her Bachelor of Science in Nursing with Honors. She currently works in  the intensive care unit at Rose Medical Center. Inspired by her personal  travel and interest in infectious disease, she joined the Global Travel  Health team in 2018.

Kenneth Greenberg, D.O., Pharm.D.

Kenneth is currently a Co-Director of Global Travel Health and had been a  Co-Director of Rose Travel Medicine since 1993. As a member of Denver  Infectious Diseases Consultants, Dr. Greenberg has continued in the  practice of Infectious Diseases. His medical appointments include the  University of Colorado for Medicine and Pharmacy, and he is a national  educator on the utilizations of vaccinations due to his association with  Global Travel Health. Dr. Greenberg is a Certified HIV Specialist and  is a national educator in HIV disease.

John Hammer, M.D.

John completed his residency in Internal Medicine and a Fellowship in  Infectious Diseases at the University of Colorado Health Sciences Center  in 1997. In 2003, he received his diploma in Tropical Diseases from the  renowned Gorgas Institute of Tropical Medicine located in Lima, Peru.  He is a Co-Director of Global Travel Heath and an active member of both  the International Society of Travel Medicine and the American Society of  Tropical Medicine and Hygiene. He has worked overseas in developing  countries in association with the International Center for Equal  Healthcare Access providing instruction to healthcare personnel in the  treatment of HIV. He enjoys working in the developing world, and simply  traveling whenever he gets the opportunity. 

New Patient Information

 When You Come For Your First Visit

  • Bring information about your medical and vaccination history, if available.  
  • Bring your trip itinerary and agenda.
  • Arrive 15 minutes prior to appointment and have paperwork completed. 
  • Please print out and complete these new patient information forms and bring them to your appointment:


Contact Us

Visit or Call to Schedule an Appointment

Please contact us directly with any questions, comments, or scheduling inquiries you may have.

Feel free to fax any documents to 303.320.1953   

Global Travel Health - Suite 740

4500 East 9th Avenue, Denver, Colorado 80220, United States

Office: 303.468.6986



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