Stored in glass vials with foil-lined lids, -70 degrees (C or F ?) 
should hold them, if you know somebody (besides the Tucson Bee Lab) with 
an ultracold, never-defrosting freezer.
Or, store in 70% ethanol/water in glass.
Otherwise, fix in Bouin's solution, section and stain with H&E 
(haematoxylin & eosin), hope for no color fading.
    -with thanks to H.K. Poole and G. Loper,
        - John Edwards

Peter Dillon wrote:

> If by chance that investigation into this episode is unable to 
> identify the cause, are there any plans to hold/store biological 
> material (i.e. Honey Bees) in a medium that would allow for future 
> investigation and comparison when required.
> I do not know what would be considered as a prime method of retaining 
> bees in stasis over long periods of time.
> If (in 2025 to give a date) another outbreak occurs and the culprit 
> fingered, then samples from this period could be retrieved and compared.

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