Dear Everton, I am not up to date with details of current production of allergen extracts by companies and labs. (I ceased research on dust mites in 2009 after my book was published.) However, there are three basic methods for separating dust mites from culture media, detailed on p. 271 of Dust Mites, using sieving, flotation in sodium chloride solution, or using a hot light source. Hope this helps. Cheers, Matt

I grew mites on frayed chicken feathers. Sergey

This can be carried out by using Berlese funnel