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 PhageBank™ phage therapies as well as for general corporate purposes.