CONTAGIOUS MAMMITIS.

Poverty Bay Herald, Volume LI, Issue 16781, 14 July 1925, Page 12

CONTAGIOUS MAMMITIS.

J'iXI’MIMuME'NT.S WITH VACCINE. Tlit! Director-General of Agrigulture •stales that since the advent, of preventive treatment for contagious manuuitis by means of vaccine, Mu* Department has been canrying oui special experiments in order to determine the extent to which the vaccine treatment affords protection against tllic disease. A good deal of this work has been done at the Wallaccville laboratory, and a Idle it is ilot yet finally completed, it will he of interest to state the results so far arrived at. These may bo summed up as follows: In the firstt experiment three cows were used, two- of them being vaccinated with the maminitis vaccine and one not vaccinated and used as a control. Of the two vaccinated cows one was afterwards directly inoculated with a small quantity of a. pure culture of the organism of contagious mammitis, the other with a small quantity of milk taken from a cow .suffering from the disease, the non-vaccinated control cow being also infected with the same dope and the same form, of infective material into different quarters of the udder. The result was that all three contracted contagious mammitis. loiter, one vaccinated cow and the non-vaccinated control cow lrave completely recovered, while tire other vaccinated cow still shows the organisms of contagious mammitis in her milk.

A second experiment was conducted on five cows. Four had been treated with the vaccine and one left unvnoeinated as a control. All.five were later inoculated with a small quantity of milk containin'; the germs of contagious mammitis. All of them contracted the disease as a result of this nytHi'dal inoculation, hut since, three of life, four vaccinated cows ami the iiiiVa' : inated control cow have recovered, while one of the vaccinated cows stilt shows symptoms of the disease.

These are the results obtained so far al Wallacevillo, but further experimental wor'c is bein'/ (ondueted.