14Pretesting of procedures for specimen conservation should be part of preliminary 15 studies for trials especially when quantification of bacteria must be performed in a second 16 time. Quantitative epidemiological studies of multidrug resistant organisms sampled from 17 rectal swabs could be then particularly favored. The aim of this preliminary study, was to 18 evaluate the performance of the flocked swab with liquefied Amies transport medium 19 ESwab TM , for the survival evaluation of aerobic bacteria, from rectal swab sampling 20 42 (5). Likewise, those species are also opportunistic pathogens and quantitative studies of the 43 prevalence, bacterial load and diversity of these species as well as E. coli in their natural 44 3 environment, which is the digestive gut, are essential (3, 6, 7). 45 Several steps in the analyses of bacteria from digestive gut are crucials and are directly 46 related to a good diagnostic performance in the Clinical Microbiology laboratory. For 47