• 1 September 1978
    • journal article
    • research article
    • Vol. 49  (3) , 179-82
Abstract
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.

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