Table 1.

Number of new intramammary infections (IMIs) over the dry period and at calving in udder quarters of untreated cows (negative control) and of cows treated with a dry cow antibiotic (positive control), teat seal, or teat seal plus antibiotic (Adapted from [33])

Experimental group	Negative control	Positive control	Teat seal	Teat seal + antibiotic
Total quarters treated	528	528	505	505
New dry period clinical IMIs	18	2*	1*	2*
New IMIs at calving	67	12*	12*	8*
Total new IMIs	85	14*	13*	10*
% of quarters infected	16.1	2.7*	2.5*	2.0*

*The difference between any of the three treated groups and the negative control group was significant (p < 0.01) in all cases.