Shake Test

1. The following 4 photographs were taken on 6
August 2003 in Suva, Fiji during the primary
vaccine store assessment (Richard Duncan
(WPRO) and Diana Chang-Blanc (PATH) on
the background).
The shake test
See the difference in sedimentation rates
Umit Kartoglu
Control vial
(purposely frozen)
The demonstration was conducted with 10 dose
TT vaccine. For better visualization, the labels
are scrubbed off. The control vial (on the left)
was purposely frozen solid at -25
o
C for 4 hours.
In principle, you do not need to wait this long.
The moment you are confident that you can tell
whether the sedimentation rates are different or
same in two vials, you may end the test.
Test vial
(passes the test :
not affected by
freezing)
In this demonstration, the test vial on the right
sediments slower compared to the control
vial: The test vial has not been affected by
freezing, and may be used safely.
Resolution of digital images in this presentation is
purposely reduced for having smaller file size

2. 10:25 am
4 minutes after placing the vials
on the table

3. 10:28 am

4. 10:31 am

5. 10:33 am