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crops of eruptions on the udder and teats extending over 

 several weeks or three or more months. Possibly the 

 later eruptions are due to infection by pus germs or to 

 mixed infection. The true cause of varicella is also un- 

 known. Yet it is infectious and can be transmitted by 

 the milker from one cow to another and possibly from the 

 cow to the milker. A similar disease in men is commonly 

 called chicken pox; so far no direct relation betw^een 

 the disease in cows and in man has been established. 



No inoculations have been made as in cow pox. 

 The treatment for this is the same as for cow pox. 



Furunculosis is a disease that is also found on the 

 teats and udder of the milch cow. It is an inflammation 

 of a hair follicle and its subaceous gland, and of a cer- 

 tain amount of connective tissue surrounding them. 

 The cause is an infection through the follicle by one or 

 more of the pus germs, usually the micrococcus 'pyogenes, 

 var. aureus or alhiis. Generally the central parts un- 

 dergo necrosis, or degenerative changes, forming a small 

 pus collection, which usually escapes by a break in the 

 skin and rarely by erupting into the milk sinus or reser- 

 voir of the udder or ducts of the teat or udder. 



Furuncles (small boils) appear usually about the base 

 of the teats, but may occur anywhere on the udder or 

 teats; some report their occurrence on the vulva and 

 perineum. 



At first the furuncle is a hard, swollen nodule, about 

 one-half inch in diameter; in the course of a few days it 

 becomes soft in its centre and with slight pressure may 

 erupt. Another or several more may appear near or 

 around the first one, and thus a series of successive 

 furuncles may appear on the teats and udder during the 

 greater part of the period of lactation. Sometimes the 

 nodules are quite deeply situated and remain Avithout 

 erupting; these are usually about the base of the teat, 



