Steffanie A. Strathdee (born May 28, 1966) is the Harold Simon Distinguished Professor at the University of California San Diego School of Medicine and Co-Director at the Center for Innovative Phage Applications and Therapeutics.

In 1998, she published a manuscript in JAMA which showed that only half of HIV+ people who inject drugs who were medically eligible for antiretroviral therapy in Vancouver were actually receiving it, which subsequently led to intensified efforts to expand access to HIV care.

[7] In 2016, Strathdee enlisted the help of an international team of physicians and researchers to save her husband's life with bacteriophage (phage) therapy after he acquired a life-threatening infection with a 'superbug', Acinetobacter baumannii.

[15][16] As a result of the Patterson case, hundreds of other patients with multidrug resistant bacterial infections have been treated with intravenous phage therapy with the help of IPATH, including Joel Grimwood and Isabelle Carnell-Holdaway.

[17] Isabelle Carnell-Holdaway was a 15-year-old patient that underwent experimental treatment in which she was the first person in the world to be administered genetically modified phages to fight a multi-drug resistant infection following lung transplantation.