(UTC) 

 The ifr link above was found dead on 22 Dec 2011 

 UK TV program "QI" broadcast 23 Dec 2011 cited that Brazil nuts are the only nut whose allergens can be sexually transmitted. The sexual transmission aspect is indicated in a study available here: http://www.ncbi.nlm.nih.gov/pubmed/17583107, here: www.jiaci.org/issues/vol17issue03/10.pdf and in other locations. I have not followed up as to whether this is unique amongst Brazil nuts, but is it worthy of being included in the main article?   23:00, 23 December 2011