POST 00562E : COLOR OF VVMs
Follow-up to POST 00558E
26 April 2003
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Moderator's note:
It appears that some members do not see what should be seen in the first
attachment to Post 00558E, "How to read VVM1". The top two VVMs should have
a tickmark on their right indicating they are OK and vaccines can be used,
while the bottom two should have an X, indicating that the vaccines should
not be used. Depending upon the version of your word processor, the font
used to show both these marks may have changed and the marks appear quite
different and meaningless.
So if you do not see the marks properly, you can change them easily as this
file is in Word format.
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Souleymane (mailto:[log in to unmask]) from WHO in IVORY COSTE wants to
share yet another tool for the interpretation of VVMs with those who have
not seen it already. Here is his message with an attachment.
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Thank you for sharing these docs. In the same order can the attached
document be shared. We have recently received it from HQ and it was really
helpful.
Souleymane
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Moderator's note :
This file is especially intended for those whose responsibility is
interpreting VVM readings. It is relatively heavy, around 0.5 MB, and is
not presently available in other WHO documents accessible through the Internet.
As its name says, this file shows the hue variation (minimum and maximum),
and the gradual transition from start to end-point color. If someone pays
attention only to the square color of a maximum darker VVM (left column),
it may be thought that it is pretty dark compared to minimum column.
What is important here is that the VVM reference circle color may vary from
batch to batch along with that of the square, but the reading principle
remains the same. As explained in the previous posting, the VVM square is
never snow white at the start point, there may be some hue variations from
batch to batch. Thus the darkness of the square should ALWAYS be compared
with the outer circle to make a decision.
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