Post00231 VACCINE FREEZING 14 March 2000
CONTENTS
1. CHANGING VACCINE STORAGE LOWER TEMPERATURE LIMIT FROM 0 TO 2 DEGREES?
2. VACCINE FREEZING IN TEMPERATE CLIMATES
3. DOMESTIC REFRIGERATOR MODIFICATIONS?
4. VACCINE LOSS? COST? A QUESTION
1. CHANGING VACCINE STORAGE LOWER TEMPERATURE LIMIT FROM 0 TO 2 DEGREES?
Continued
The current EPI vaccine storage recommendation for refrigerator storage is
one month at 0 'C to +8'C. Other regions of the world and other countries
recommend +2'C, or even +4'C to 8'C. Many manufacturers label their vaccine
vial for storage between 0'C and 10'C.
Mary Catlin, PATH, proposed in Post0218 that, considering the risk of zero
degree storage on HepB - a vaccine coming into wide routine use, that we
try to modify the current recommendation to +2'C to +8'C on the TECHNET
Forum.
The discussions so far have see to the need to raise the lower vaccine
storage temperature limit for vaccines stored in refrigerators, but have
identified some engineering and cost constraints. Extending the proposed
change beyond electric refrigerators appears to be problematical. Other
technology based solutions are not in advanced states of development.
Terry Hart, IT Power India, in Post0226, pointed our that the accuracy of
built in refrigerator thermometers can be in error by as much as 4 degrees,
using existing technologies and called for a new specification for
refrigerator thermometers.
In Post0226, Michel Zaffran, WHO/V&B, raised 3 constraints that need to be
evaluated if we are, in fact, going to change a vaccine storage equipment
specification.
___________________________________________________________________________
From Michel Zaffran, Post0226: Constraints
1. If you restrict the allowed temperature range to 2 to 8'C, you make it
more difficult for the appliance to maintain that range hence more
expensive machines
2. For some of the appliances working on gas, kerosene and solar, which we
use a lot, if you restrict to 2 to 8'C, then the evaporator often will not
get cold enough to freeze icepacks in the freezer compartment, or you would
need two compressors or cooling systems and a more expensive appliance
3. Finally, hep B does indeed freeze at-0.5 to -1 degree but a/.this
is the temperature inside the vial and this corresponds to approximately
-3.1 degrees in the fridge and b/ this is the scientific freezing point but
there is, in fact, a substantial amount of supercooling down to -7.8
degrees before the vaccine actually crystallises and gets damaged by
freezing.
___________________________________________________________________________
Todays post from Eric Laurent, WHO/WPRO, and Anthony Battersby, FBA Systems
Analysts, and Mogens Munck, UNICEF, continue the discussion from TECHNET
Forum Post0218 T-ZONES & LOW TEMPERATURE PROTECTION, 18 January 2000 and in
Post0226 VACCINE FREEZING, on 8 February 2000.
Nothing is simple. The issues that arise in this discussion are:
* Should the WHO change the operational recommendation - guidance to health
workers: " Adjust your refrigerator so that it operates between +2'C &
+8'C under your local conditions "?
* What is the status of Vaccine Vial Freeze Monitor development?
* What is the status of + 2'C Eutectic Ice Pack development?
* Needed: A specification for integral refrigerator temperature monitoring
accuracy.
* Should the WHO change the specifications for vaccine storage
refrigerators or other cold chain equipment to ensure their capability of
maintaining +2'C to +8'C vaccine storage at each of the Temperature Zones?
[See T-Zones in Post0218]
* Have the cold chain equipment manufacturers identified the cost
implications of the change in specification?
* If there are costs, can they be funded if needed?
**** Manufacturers comments are needed, please!
Contributions, comments and additions please: [
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or use your reply button
___________________________________________________________________________
Date: Thu, 10 Feb 2000 22:55:45 -0500
From: Laurent
Subject: Comments on Post0226
To: Technet
Dear Allan,
To complete the latest reply made by Michel Zaffran, about the difficulties
for the appliance to maintain that range of temperature (2-8 C), we should
remember that it is almost impossible to guarantee the 2'C in a well
insulated cold box (at least with ice packs using only water).
I did some laboratory testing for a private company which was freighting
clinical products in cold boxes. We almost always got a temperature (at
least for the first hours) between O and 2 C.
It will be difficult to guarantee the standard +2'C to +8'C in our actual
cold chain.
Thanks,
Eric
---
Date: Wed, 9 Feb 2000 00:21:23 -0500
From: Anthony Battersby
Subject: Post0226 VACCINE FREEZING
To: Technet Moderator
Dear Allan,
I strongly support the proposition that the lower storage temperature be
+2degC. With the VVMs surely we can live with +2/+10degC, still giving us
an 8 degree range. There are new and very expensive vaccines which do not
have adjuvant but are still damaged by temperatures below zero. As vaccine
development progresses it seems that the risk of freezing temperatures
becomes more critical. On which point. WE REALLY NEED A ZERO SENSITIVE
VVM. Lifelines say they are working on it, when can we have an idea of
when it will be available. Can anyone else make a freeze sensitive VVM?
Freeze Watches are too expensive and cannot be vial specific.
Anthony
---
Subject: Re:Post0226 VACCINE FREEZING
Author: Mogens Munck
Date: 2/12/00 9:45 AM
12.2.2000
Re.: Changing vaccine storage lower temperature limit from 0 to 2 degrees.
Dear Allan,
Due to change of address I did not get the previous post where this topic
was discussed, if I had I would have reacted sooner.
However, Michel Zaffran has very much said what I wanted to say,
particularly in item 1 and 2 in his contribution. Changing the limit from
0-2 degrees make things very difficult for the manufacturers, particularly
if you want a fridge that at health center level keeps vaccine at positive
temperatures, and AT THE SAME TIME PRODUCES ICE PACKS IN ANOTHER CHAMBER IN
THE SAME FRIDGE. At health center level you need a fridge for two purposes:
keeping your vaccines cold between 0/2 and 8 degrees and ice packs for
outreach.
The design engineers I have talked to would very much prefer a lower
temperature limit of minus 2 degrees. I think that they throw the towel if
you raise it to plus 2 degrees. However, WHY NOT ASK THEM FOR THEIR
OPINION.
Personally, I have always believed that the solution would be having
icepacks with eutectics that freeze in the same temperature range at which
you keep the vaccines. As soon as I receive here in Maputo my personal
files from my home I will start up on field trials of Glaubers' salts,
please refer to Technet Copenhagen and a previous Technet posting on
eutectics.
Many regards!
Mogens
___________________________________________________________________________
Moderators note: Eutectics were discussed in TECHNET Post0188 COLD CHAIN &
EUTECTICS & LTP, 28 September 1999.
____________________________________*______________________________________
2. VACCINE FREEZING IN TEMPERATE CLIMATES
Vaccines freeze in the cold chains in colder and non-tropical countries.
The Technet has been concerned with this problem since its first global
meeting in Cyprus in 1990.
Work has been done to confirm the problem and develop low temperature
protection (LTP) equipment specifications, the definition of a colder and
temperate equipment temperature zone, and more effective vaccine management
procedures.
A 0'C FreezeWatch indicator is available. The soon to be prepared revision
of the cold chain equipment product information sheets [PIS] should
incorporate the new T-Zones and LTP. Long needed but not available are
Vaccine Vial Freeze Indicators.
Hala Azzam, USAID, asks what has been done and the availability of
materials on vaccine freezing in temperate and colder climates. Robert
Steinglass, BASICS, discusses what was done in the past under the REACH and
BASICS project and identifies technet reports on the problem. Jaap
Dominicus, MSF/A, is interested in research if needed.
Two TECHNET reports and a presentation are now available for download.
The moderator was co-author.
The files are now available for download:
Vaccine Storage in cold climates-1998.zip 91 Kb
VaccineStorageInColdClimatesTechnet98.PDF 480 Kb
Warmchain.zip 317 Kb
Send an email to: [
[email protected]]
[email protected][/email]
with the message:
get technet Vaccine Storage in cold climates-1998.zip
get technet VaccineStorageInColdClimatesTechnet98.PDF
get technet Warmchain.zip
Or go to the FTP website:
ftp://ftp.acithn.uq.edu.au/Technet/1-ClickHereForTECHNETfiles/
Click on the folder "VAX-Freeze" and then click on the files
* How do we get timely implementation?
Action, comments and additions please: [
[email protected]]
[email protected][/email]
or use your reply button
___________________________________________________________________________
From: "Hala Azzam"
Date: 02/24/2000 1:27 PM:
To: "Emily Wainwright"
In response to your query about the cold climate cold chain problem in our
region, I raised the question of vaccine freezing in the WHO/TECHNET
meeting at Harare. I got information that PAHO had worked on a low tech
solution and that for a $1000 dollar or so, a study could be performed for
our region. The basic idea is to use the cold box with the ice packs at
room temp and using them to maintain safe vaccine temperature during
transport.
As a result of raising this issue MSF has expressed interest and I recently
got an e-mail from Jaap Dominicus at MSF/amsterdam saying that he is
willing to do research in that area and testing of equipment in cold
countries if need be.
I would like to know what are the next steps we could take in this area to
help facilitate this activity and use it for our region.
I have enclosed below a paragraph of info from TECHNET on the problem of
vaccine freezing
___________________________________________________________________________
Post0226 VACCINE FREEZING 8 February 2000
INTRODUCTION OF FREEZE SENSITIVE VACCINES INTO THE EXISTING COLD CHAIN
Soren Spanner, WHO/SEARO, raises the fact that existing cold chain
equipment meeting the agreed WHO/UNICEF/EPI cold chain specifications
does not provide low temperature protection. This current equipment will
continue to freeze damage both of the routine vaccines DTP and TT, but
with the wider introduction of Hepatitis-B and Hib, among other new
vaccines, this equipment will freeze large quantities of the newer more
expensive vaccines. The cost to national immunization programs in wasted
activity,resources, disease and credibility will not be negligible.
___________________________________________________________________________
Sincerely,
Hala
----
From: "Emily Wainwright" 02/28 9:17 AM >>>
Hi Robert,
Didn't BASICS look into some of the issues of vaccine freezing in the NIS?
What was the verdict on this type of technology in the region?
Emily Wainwright
Office of Health and Nutrition
U.S. AID
Phone: (202) 712-4569
Fax: (202) 216-3702
e-mail: [
[email protected]]
[email protected][/email]
---
From: "Robert Steinglass" , on 02/28/2000 4:30 PM:
To: Emily [
[email protected]]
[email protected][/email]@AIDW
Cc: technet moderator
At REACH and then BASICS, we documented the extent of the problem of
accidental freezing in health facilities in Moldova and Kazakhstan using
TTMs (Tiny Tim Monitors) - tiny computerized temperature data loggers. It
was largely the result of our work that we supported the renewed TECHNET
concern for accidental vaccine freezing in temperate climates. Remember
that the global cold chain was largely designed with tropical climes in
mind.
Also, in the NIS, frequently health facilities conserve energy by turning
off refrigerators during the winter, which doesn't help keep the
temperatures inside refrigerators in the right narrow range or protect
vaccines from freezing given the ambient temperatures in winter in the NIS.
One of the most important problems in the NIS is that those countries still
dependent on supplies from Russian suppliers (which includes most NIS for
booster doses of some vaccines which UNICEF won't supply, as well as some
vaccines like monovalent mumps) receive their vaccines in uninsulated
wooden cartons without ice. This is the same problem we documented in
1992. I still have an example of the container. Of course, for a cold
chain problem to occur at such high levels of the cold chain through which
all vials must pass is ridiculous, as it is easily remedied and affects
every vial. In my mind, this is one area where a bit of interest and
effort is needed. A firm in Russia even has developed the right cold box,
but the countries have to agree to specify its use when vaccines arrive
from Russia.
There are many issues. I am not sure how much more testing is really
needed. It is solutions that we want. Maybe Hala would be interested in
some of our materials. (You could forward this to her if you like, as I
don't have her e-mail address.)
Robert
---
Date: Tue, 8 Feb 2000 10:02:25 +0000
From: [
[email protected]]
[email protected][/email] (Jaap DOMINICUS)
Subject: vaccine freezing
To: [
[email protected]]
[email protected][/email]
Dear Alan, Anthony, Hala and others,
I am well aware of the risks of freezing vaccines in warm countries.
Unfortunately I have no data on the occurrence and impact of this
problem in our projects.
We do see the need for a freeze vial monitor.
On top of this problem, we are working in cold countries, where even the
transport of vaccines in cold boxes might cause freezing. Has anyone good
information or recommendations on this subject?
We are willing do research or testing of equipment in cold countries
if need be.
Best regards,
Jaap Dominicus/Menno Goedhart
Field Support Unit
MSF-Holland
---
To:
From: "Hala Azzam"
Subject: re: fwd: Re: fwd: Low tech solutions for vaccine freezing!
Hi Robert
Thanks for the info. I would like to get the documents you mention.
Especially as it regards Russia and vaccine distribution, it seems
leverage is needed. With GAVI/ GFCV and introduction of hepatitis B, this
may be an area they may want to put pressure on.
Hala Azzam, PhD
AAAS Fellow
USAID/E&E/EEUD/HRHA
tel 202- 712 1585
fax 202- 216 3409
email: [
[email protected]]
[email protected][/email]
____________________________________*______________________________________
3. DOMESTIC REFRIGERATOR MODIFICATIONS?
In Post0212, VACCINES & COLD CHAIN, 26 November 1999, TECHNET Forum posted:
a warning from Anthony Battersby, FBA Health System Analysts, on the
vaccine freezing conditions in "frost free" and "multi-flow" refrigerators
and called for accelerated efforts to develop and implement vaccine vial
freeze indicators.
In Post0214, VACCINE FREEZING 07 January 2000, Nan Miller, CDC-THS, posted
comments in responses to the ALERT: FROST-FREE REFRIGERATORS IN THE COLD
CHAIN. It turned out that the refrigerators were not "multiflow"
" Although freezing of vaccines remains a concern we have reduced losses
due to freezing from over 47% to less than 5% during storage using only
modified, frost free refrigerators. "
This brought a series of questions from TECHNET Forum subscribers asking
about the modifications.
Terry Hart, IT Power India, informed us in Post0226, that training
materials for making the refrigerator modifications on scale were validated
some years ago.
* In todays post Carib Nelson, PATH, asks about the modifications. Eric
Laurent, WHO/WPRO, has kindly made the file of the Refrigerator
Modification Manual available to the TECHNET Forum. Thanks!
The table of contents and the first page are reproduced below.
The file, in MSword format is available as zip file:
DomesticRefrigeratorModificationManual-1996.zip 204 kb
To get the file send an email to: [
[email protected]]
[email protected][/email]
with the message:
get technet DomesticRefrigeratorModificationManual-1996.zip
Or go to the website:
ftp://ftp.acithn.uq.edu.au/Technet/1-ClickHereForTECHNETfiles/
Click on the folder "ColdChain" and then click on the file:
DomesticRefrigeratorModificationManual-1996.zip
Contributions, comments and additions please: [
[email protected]]
[email protected][/email]
or use your reply button
___________________________________________________________________________
From: "Nelson, Carib"
To: Technet Moderator
Subject: RE: Post0214 VACCINE FREEZING
Date: Tue, 8 Feb 2000 03:15:00 -0800
Hi Allan:
Did Nan ever respond regarding the modifications they made to the frost
free refrigerators in Australia? It would be useful info for some of units
we have in Indonesia.
Thanks
Carib
---
Date: Thu, 10 Feb 2000 22:55:45 -0500
From: Laurent
Subject: Comments on Post0226
To: Technet
Dear Allan,
Just to let you know that WPRO made some research, trial and guidelines a
few years ago regarding domestic refrigerator modifications.
These modifications are simple, and were aimed to be easily made by a local
technician. Although such modifications can not rise the quality of a
domestic refrigerator to the standard of refrigerator like Vestfrost or
Electrolux, they improved the performances. In countries where domestic
refrigerators are widely spread (China, the Philippines, and etc.), it
could be useful.
We finalized a manual with spreadsheets and drawings and will email it to
the Technet Forum.
Eric Laurent
Thanks,
Eric
___________________________________________________________________________
A DOMESTIC REFRIGERATOR FOR SAFER VACCINE STORAGE
A MANUAL FOR HEALTH STAFF AND COLD CHAIN TECHNICIANS
September 1996
Alasdair Wylie, WHO Consultant
Eric Laurent, WHO Consultant
Bernardo Bersola, Cold Chain Engineer, DoH Philippines
Rene Barlin, Cold Chain Technician, DoH Philippines
Roland Garcia, Cold Chain Technician, DoH Philippines
___________________________________________________________________________
CONTENTS
INTRODUCTION Page
Why modify ? The Objectives 2
What to modify ? The Tasks 3
How to plan the work 3
How to use this manual 3
MODIFICATIONS
1. Preparing the refrigerator 4
2. Water containers underneath the freezer 5
3. Water containers in the bottom section 6
4. Insulation material inside the door(s) 7
5. Insulated box for vaccine storage (optional) 8
6. Restarting and using the modified refrigerator 9
ANNEXES / REMOVABLE PLATES
Summary of modifications 10
Materials, tools and spare parts required 11
Correct vaccine lay out in a single door refrigerator 12
Correct vaccine lay out in a double doors refrigerator 13
___________________________________________________________________________
INTRODUCTION
Why modify ? The Objectives
Laboratory and field tests done for WHO show that domestic refrigerators
can be unsafe for vaccine storage in tropical climates but also in cool
climates :
* Temperatures are often too high for vaccine storage in many parts of the
refrigerator, specially close to the door and in the bottom section
* During power failures, the "holdover time" - time for which the
refrigerator can keep a safe temperature for vaccines - is very short,
mostly because of poor insulation
* When ice packs are being frozen, the temperature inside the refrigerator,
specially on the top, can be negative and put adsorbed vaccines at risk
(DPT, TT and Hepatitis B)
Tests also show that with certain simple modifications, risks can be
reduced and vaccines stored safely in a domestic refrigerator :
* Temperature stability improves in the different sections of the domestic
refrigerator
* Holdover time increases and becomes reliable
* Running costs are being reduced due to a better insulation
It is essential, however, to stress that such modifications are not a
substitute for proper regular use and care of the refrigerator (temperature
monitoring, defrosting, door seal checking and preventive maintenance).
_________________________________*_________________________________________
4. VACCINE LOSS? COST? A QUESTION
Carl Erickson, Solar Ice Company, asks an interesting question.
Action, comments and additions please: [
[email protected]]
[email protected][/email]
or use your reply button
___________________________________________________________________________
From: [
[email protected]]
[email protected][/email]
Date: Tue, 7 Mar 2000 11:40:13 EST
Subject: Technet Post
To: [
[email protected]]
[email protected][/email]
Dear Technet Members:
I am interested in information on what percentage of vaccines is lost due
to overheating, freezing or mishandling and what the cost is.
Carl Erickson
____________________________________*______________________________________