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 Castings come through worm. Vermicompost has 
castings in it, but can and usually does contain considerable organic matter 
that has not been through the worm. You really need to be extra, extra careful 
handling some of this as there is a disease known as organic dust toxic syndrome 
(ODTS) which can result in airway irratation, stomach and intenstinal 
problems.....a dust mask will help. 
Testing is important. Know your source. There is 
some great worm vermicompost out there and some bad vermicompost. Also, you have 
to consider diversity. 
Cheers, 
Jeff 
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