On 3 June 2015, Miss Yiqing Wei successfully presented and defended her Master thesis. Prof. Hong-Yu Ou was her supervisor. Yiqing’s thesis systemically illustrates the toxin-antitoxin system in sequenced Klebsiella pneumonia genomes. We were delighted to have her in the lab and enjoyed working with her. We wish her every success in her future endeavors. Congratulations to her!