Good results have been achieved through a comparative study carried out on a sample of 362 cultures in order to verify the attendibility of a new method of research on bacteriuria. The new Urotube system follows the theorical bases of dip-inoculum of a substratum of a medium of culture. The changes which were verified after the simultaneous use of the two methods on the same sample, were very slight and meaningless for the crossed calculation of the chi2. The second part of the research refers to the qualitative side and test out the bacterial species found out us the considered samples. There were no important varieties between the studies of the following AA. (Kass, Schito) and ours; most infectious processes have, as ethiological agents, gram-negative bacteria, named Enterobacteriacae, which are much more numerous than gram-positive bacteria. It seem however important to underline a slight change of this ratio; it was verified during our test, infact we recorded a percentage of gram-positive higher than the percentage recorded by Kass and Schito.