Scavenger hunt for e-VVM (APR-JUN 2016)
Friday, February 27, 2015
Wednesday, February 25, 2015
VVM guidelines
5.4.6 How to check for heat damage?
Vaccine Vial Monitor (VVM)
Reading VVM: VVMs are labels on vaccine vial that have a small white square
inside a blue circle. As the vial is exposed to cumulative high temperature,
the color of the white square will change. Read the VVM (see below) and
determine whether the vaccines have been damaged by heat. If these vaccine
vials show change in colour to the discard point, then discard the vaccines.
Remove vaccines that have reached discard point from the vaccine carrier.
Vaccine Vial Monitor and reaction rates:
There are four types of
VVM, which are assigned based on the different stability characteristic of the
product.
The table below
summarizes different levels of VVM reaction rates by category of heat stability
Category (vaccines)
|
No. of days to end
point at +37C
|
No. of days to end point at + 25 C
|
Time to end point at +5C
|
VVM 30: High stability
|
30
|
193
|
Ø 4 years
|
VVM 14: Medium
stability
|
14
|
90
|
>3 years
|
VVM7: Moderate rate
stability
|
7
|
45
|
Ø 2 years
|
VVM 2: Least stable
|
2
|
NA
|
225
days
|
Tuesday, February 24, 2015
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