Adaptive Phage Therapeutics (APT), a clinical-stage biotechnology company dedicated to providing therapies to treat infectious diseases, today announced that the company has closed a $40.75 million Series B investment round led by Deerfield Management Company. Also joining the Series B round are existing investor Mayo Clinic and an additional undisclosed institutional investor. Proceeds of this financing will be used to accelerate clinical development of PhageBankTM phage therapies, as well as for general corporate purposes.