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  1. Umit Kartoglu
  2. Cold chain equipment
  3. Monday, 21 October 2019

The story of a time and temperature indicator (vaccine vial monitor) that has dramatically changed the course of vaccine management practices as well as shaped the future of cold chain, THE BOOK OF VVM: YESTERDAY-TODAY-and-TOMORROW is now available for free download in ePUB3 and PDF formats.

vvm cover copy

We may ask ourselves where humanity might be without some of the greatest inventions that have come to pass. Great ideas have continuously changed the path of human civilization over time with vaccination being widely considered one of the greatest medical achievements of modern civilization. Many commonplace and preventable childhood diseases are now increasingly rare because of vaccines. The concerted human effort to bring the vaccines to the ones who need them at the right time is remarkable.

Just one example of the dedication and self-sacrifice involved was the 1925 ‘Serum Run’ between the settlements of Nenana and Nome in Alaska also known as the Great Race of Mercy. This involved a famously grueling winter expedition across the frozen Alaskan interior using dog-sled relays to take diphtheria antitoxin to the beleaguered township of Nome where an outbreak of diphtheria was threatening around 10,000 local Alaskan natives who had no natural immunity to this lethal disease. The epic journey took 20 mushers and about 150 sled dogs just five and a half days to cover the 1,085 km route. This display of bravery and determination was how the small town of Nome and the communities surrounding it were saved from an incipient epidemic. Balto, the lead sled dog on the final leg into Nome, became the most famous canine celebrity of the era. Balto’s statue became a popular tourist attraction both in New York City’s Central Park and downtown Anchorage in Alaska.

The vaccine vial monitor (VVM) is one of the most important inventions of the last century; one that has dramatically changed vaccine management practices and continues to shape the cold chain. In 1996, when VVMs started to get to countries with the oral polio vaccine (OPV), I was the health officer for the UNICEF Central Asian Republics and Kazakhstan Area Office. I remember one particularly cold night going to the airport in Almaty at 03.00 am to receive the very first shipment of OPV with VVMs. For years, I was a humble VVM user and advocate in the field. Things started to change when I was hired by the WHO Headquarters ‘Access to Technologies’ team in 2001 and VVM became one of my prime responsibilities. That was at a time when vaccine manufacturers were dragging their feet about incorporating VVM onto vaccines other than OPV. My brief was to overcome this resistance from the manufacturers, an objective that formed the basis for my plans for the historic 2002 VVM technical consultation meeting.

In 2007, I immensely enjoyed organizing the event to celebrate the 10th year anniversary of VVM introduction. Visiting Niger, Indonesia, and Vietnam for the shooting of the “Five Senses” video is full of cherished moments.

Screen Shot 2019 10 21 at 20.44.21 copy

Towards my retirement in August 2018, I conceived the idea of writing this book. I was one of the few people who had witnessed the decades-long programme of VVM development from its birth to its maturity. I had worked with sweat and tears to get VVMs onto all vaccines as well as tirelessly helping vaccine managers and health staff to excel in using the VVMs to their utmost potential. Today, it is a great pleasure to see one of my e-VVM based vaccine management course graduates (2015), Junaidu Adamu Barde from Nigeria, working for the Clinton Health Access Initiative, using the course learning materials to duplicate efforts in his country.

I worked on this book from September 2018 to August 2019. I went through every single published and unpublished work on VVMs, watched all available videos about VVMs and the early contending products, talked to key people, some face to face, others over the phone. I visited the U.S., Albania, Burkina Faso, and Sierra Leone. Unfortunately, there were some people I just could not reach despite all my efforts with email and phone messages. And, although I considered myself highly knowledgeable about VVM, I was simply amazed at the volume of new information I discovered and the knowledge I gained.

I had originally wanted this book to be a concise, structured, globally-relevant manual that provided comprehensive information on a wide scope of issues; in other words, an ‘A-Z of VVM’. In the event, it turned out to be more voluminous than I thought. I did not want to restrict myself when there are so many clever, dedicated and selfless individuals that have made this near-miraculous innovation a reality and in doing so contributed to saving, literally, the lives of millions.

So, I am happy that it became a celebration of all the efforts of individuals, organizations, agencies, donors, and manufacturers involved in the development, scaling, applying, advocating for, enforcing, helping health workers to excel in their practice, and using it.

As with my previous books, I have again licensed this work under the Creative Commons (CC) Attribution-NonCommercial-ShareAlike 4.0 International License (CC BY-NC-SA 4.0). The book can be reproduced, remixed, tweaked or built upon non-commercially.

I am grateful to Temptime Corporation, and especially to Renaat Van den Hooff and Ted Prusik for sponsoring the creation of this book. I thank Emily Moore for the VVM literature list she put together, it eased my search enormously. I also thank all the individuals I have interviewed for their time and everything they have shared with me. I am thankful to all my colleagues who sent me photographs, and documents. Many thanks to Kadir Abbas for making again an excellent job on the cover and page design, print, and ePUB3 conversion. Gencer Yurttas deserves a special thank you for his immaculate VVM photography. I deeply appreciate Alan Kennedy for his editing work, and Umran and Gokhan Akaalp's help in developing the book’s website. I am grateful to my wife Nellie and daughter Deniz Nala who supported me with love. Deniz Nala was already helping me at the age of 14 measuring VVMs with a spectrodensitometer and entering data into an Excel sheet to calculate optical density differences during a VVM based vaccine management eLearning course.

I never imagined that for something only 0.38 cm2 in size that I could write a book of 424 pages. This ‘little big thing’, now reinventing itself with the incorporation of a peak threshold indicator as well as entering the digitized supply chain with the integration of 2D barcodes, never ceases to amaze me.

For download please visit

The book is available both in interactive PDF (32.9 MB) and ePUB3 (24.4 MB) versions. 424 pages...


Serge Ganivet Accepted Answer



My sincere congratulations for this excellent book, the fruit of long research and experiences in the field. I won't forget how far you have come not only to develop this indicator but also to convince those involved in vaccination and its use in vaccine management. You can be very proud of your contribution to vaccine management, among others. Thank you for all what you have done, including for my coaching !

Serge Ganivet

iSCM Specialist / UNICEF WCARO

Route des Almadies, Immeuble Madjiguene, BP 29720, Dakar Yoff, Senegal

Office (direct): +221 33 8310 855 | Cell: +221 77 740 4679

Email: / Skype: sergemanivelle

  1. more than a month ago
  2. Cold chain equipment
  3. # 1
Larry Schlussler Accepted Answer

"Buffered Cold Chain"


After reading Umit's book my interest in what I call the  "buffered Cold Chain"  BCC, was renewed.In his bookI found the history and the description of the obstacles which were overcome very interesting.
By BCC I mean a cold chain which will maintain temperatures between 20 degC and 25 degC . Thesehigher temperatures could be maintained with simple low cost systems.  These life of a vaccine will be shortened at these higher temperatures however in many instances the reduced life will be adequate.  The time to end pointat these temperatures can be determined form the the graphs on pg 183 of Umit's book. At 20 degC the life of a VVM 2 vaccine will be 22 days and the life of a VVM 7 will be considerably longer 89 daysand the life of the less sensitive vaccines will be even longer.
An interesting point is that a 5 degC change in temperature will change the life of all
vaccines by a factor of aproximately two, this can be seen form the graphs on pg 183 of Umit's book. For example if the storage temperature of a VVM 14 vaccine increases from 15 degC to 20 degC it'slife will decrease from about 400 days to 200 days, for a VVM2 vaccine if the storage temperature increases from 20 degC to 25 degC  the life of the vaccine will decrease from about 20 days to 10 days.
Storage temperatures in the 20 degC to 25 degC are easily attained by thermal electric cooling.These solid state devices are reliable, low in cost and light weight, unfortunately at lower temperatures
they are very inefficient. However in the 20 degC to 25 degC temperature range they can provide reliable refrigeration.
A thermal electric cooled refrigerator can be purchased for less than $100 and with slight modifications thecooler could be connected directly to a solar module.The installed system cost of SDD thermal electric coolerwould be about one fifth the cost of a standard compression driven SDD system. The thermal storage required to maintain adequate temperatures at night will be considerably less than what is required in standard SDD refrigerators because the storage temperature will be close to thenight time temperature. 
Thermal storage requirements could be further reduced by incorporating "Time Temperature Integration"in the monitoring device. On pg 150  of Umit's book he points out how MKT temperatures can fulfill this function. The MKT temperature is a weighted average which counts higher temperatures more than lower temperatures.Details of how MKT temperature is used to determine the impact of a temperature excursion aredetailed in the Science section of Umit's book. If for example at night the temperature climbs to 28 degC,and during the day the cooling system reduces the temperature to 12 degC  the MKT temperature may be about 22 degC; with this temperature excursion the life of the vaccine willbe the same as a vaccine which is constantly kept at 22 degC. A small electronic device could be built which would display the MKT temperature and also the loss of life of the stored vaccines. The loss of life could be displayed for vaccines of different sensitivities. the results displayed would be consistent the change of life indicated by VVM's.
The Buffered Cold Chain is another tool to expand the cold chain in a low cost manner.
If there is further interest in this concept, please contact me.

Larry Schlussler  Phd
Sun Frost


  1. more than a month ago
  2. Cold chain equipment
  3. # 2
Matondo Phaku Accepted Answer

warm congratilations to Mr UMIT for this great work,what important.

  1. more than a month ago
  2. Cold chain equipment
  3. # 3
Dr Daudi Manyanga Accepted Answer

Thank you, Umit for the release of the VVM book. The main purpose of book documentation is to provide sufficient information or instructions for improving decisions now and in the future. This was fully achieved after the release of the VVM book. The book went further to persuade readers for enacting good practices from malpractices.

  1. more than a month ago
  2. Cold chain equipment
  3. # 4
Nguyen Nga Accepted Answer

Thanks Umit for writting this book. Although I am very familiar with VVM and some parts of VVM story, It is  still so impressive with  a long journey of VVM innovation and VVM's heroes 

  1. more than a month ago
  2. Cold chain equipment
  3. # 5
Modibo Dicko Accepted Answer

Warm congratulations to Umit for this immense and informative work!




Modibo Dicko, Consultant

Supply & Solar Systems - Scaling Up Strategies for Health

Cité El Farako, Porte 145 Rue 806, Bamako, MALI

Chemin Terroux 29bis, 1218 Gd Saconnex, SWITZERLAND

Bamako: +223 66 34 89 84 / +223 75 43 34 41

Geneva: +41 76 716 32 42


Skype: mobydick511 



  1. more than a month ago
  2. Cold chain equipment
  3. # 6
Dan Brigden Accepted Answer

Wonderful news, heartiest congratulations Umit. Will it be possible to buy hardcopy versions of the book?

  1. more than a month ago
  2. Cold chain equipment
  3. # 7

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