VIM-15 and VIM-16, Two New VIM-2-Like Metallo-β-Lactamases in Pseudomonas aeruginosa Isolates from Bulgaria and Germany

Two Pseudomonas aeruginosa urine isolates from Bulgaria and Germany produced two new VIM-2 variants. VIM-15 had one amino acid substitution (Tyr218Phe) which caused a significant increase in hydrolytic efficiency. The substitution Ser54Leu, characterizing VIM-16, showed no influence on enzyme activity. Both genes were part of class I integrons located in the chromosome.