Hi Margaret,

There is a type of bacteria called Serratia that produces a red/pink
pigment. It is pretty common and can be a contaminant in the lab. I believe
it has been used over the years in biological attack experiments to track
how quickly organisms can be spread around - it was thought to be pretty
harmless. However, it can cause severe infections in some folks and is
implicated in nosocomial (hospital-acquired) infections. It shouldn't grow
very quickly in the refrigerator, but it is a pretty adaptable organism and
will stay alive and grow slowly even at low temps.

Sharon Knorr, BSMT(ASCP), IBCLC


On Fri, May 27, 2011 at 9:29 AM, Davis, Margaret E <
[log in to unmask]> wrote:

> Case:  When mother pumps, her milk is white.  After refrigeration,
> splotches of bright hot pink colors appear on the bottle, nipple and through
> the milk.
>

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