Final answer:
The term for the BSE type found in the US in recent years is 'atypical', differing from the 'classic' form associated with variant CJD in humans.
Step-by-step explanation:
The single word used to describe the "type" of Bovine Spongiform Encephalopathy (BSE) that has been found in the US over the last 10 years is atypical. This form of BSE occurs sporadically and affects older cattle, presenting with symptoms that vary from the classic BSE. This contrasts with variant CJD in humans, which is associated with the consumption of meat from cattle infected with classic BSE.