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Serological titers to various leptospiral serovars before and after vaccinating gilts with three commercial vaccines.

The antibody response to various leptospiral serovars was evaluated in six-month-old gilts vaccinated with three commercial vaccines, each containing five leptospiral serovars.All three vaccines elicited a significant postvaccinal antibody response to Leptospira canicola, grippotyphosa and icterohaemorrhagiae (copenhageni). The antibody response to the other leptospiral antigens in the vaccines varied among the vaccinates. None of the vaccinated groups developed significant titers to L. hardjo. Two of the three vaccines elicited a significant postvaccinal response to L. pomona, but in each case the titer mean of the vaccinated group was <1/100. Although not among the antigens in the vaccines, titers to L. bratislava increased in all vaccinated groups, except one, and in one control group.