Deerberg F, Pittermann W
J S Afr Vet Assoc. 1978 Sep;49(3):179-82.
The mortality rates and spontaneous diseases defining the course of natural mortality graphs in colonies of Han: NMRI mice kept under conventional, SPF and germfree maintenance conditions are reported. A specific problem in SPF colonies is caused by ubiquitous germs. The lesions and possible reasons for such types of infections are discussed.