(1) The occurrence of further outbreaks of lumpy wool in South Africa is reported.
(2) The isolation and morphological and cultural characters of
Actinomyces dermatonomus are described.
(3) The production of the lesions of lumpy wool in laboratory animals and in sheep by the use of cultures and material from naturally infected sheep is recorded.
(4) The probable method of natural infection, and curative measures are discussed..
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