Strongyloides are not endemic in the UK either, but it was the Hospital of Tropical Diseases in the Uk that diagnosed me thru blood seriology test. Neither have I travelled to areas where it is endemic.
look at the Morgellons forum. there is a theory that it can be contracted by wearing cotton goods imported from Thailand and other areas....
I think with the amount of international travel and the possibility of getting infected by other people who have been to these places is spreading these parasites.
my Naturapath is treating an 80 yr old lady who in the last ouple of yrs has contracted Morgellons , and no way has she been to these areas!