 REHOVOT, Israel, May 19, 2021 GLOBE NEWSWIRE -- Purple Biotech Ltd. Purple Biotech , or the Company NASDAQTASE: PPBT, a clinical-stage company developing first-in-class, effective and durable therapies by overcoming tumor immune evasion and drug resistance, today announced the appointment of Suzana Nahum-Zilberberg, a seasoned biopharmaceutical Industry executive, to its Board of Directors. 