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Comparison of the proportions of oral bacterial species in BALB/c mice from different suppliers

In order to assess the influence of the origin of mice on their oral bacteria, the proportions of bacterial species found in the oral cavity of BALB/c mice from 5 suppliers were determined. The results indicated that mice from different origins harboured different oral bacterial populations upon arrival at our animal facilities and the differences persisted for at least one week after arrival. Except in one case, the oral bacteria did not differ from one shipment to another from each supplier and remained similar after one week at our animal facilities. The results thus indicate that the composition of the oral bacterial population is influenced by the origin of the mice.