Table 2.

Relative percentages of mice housed in barrier, nonbarrier, or barrier and nonbarrier housing and the prevalence of outbreaks by housing type

Facility type	% of total mice in facility type	% of MHV, EDIM, MVM, and TMEV outbreaks	% of MPV outbreaks	% of pinworm and fur mite outbreaks
Barrier	69	9	38	55
Nonbarrier	18	81	45	32
Barrier and nonbarrier	12	9	17	13