Arsanis, Inc., a clinical-stage biopharmaceutical company developing targeted monoclonal antibodies (mAbs) for pre-emptive and post-infection treatment of serious infectious diseases, today announced the closing of a $45.5 million Series D financing led by the Bill & Melinda Gates Foundation. Several additional new investors participated in the financing, including GV (formerly Google Ventures) and Alexandria Venture Investments. The company’s existing investors, including OrbiMed, Polaris Venture Partners, SV Health Investors, NeoMed, EMBL Ventures and the Anna Maria and Stephen Kellen Foundation also participated in the Series D round.
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