Arecent virology study showed the novel, broad-spectrum influenza PB2 inhibitor CC 42344 exhibits strong antiviral activity against the highly pathogenic H5N1 avian influenza A strain.- CoCrystal Pharma

 Cocrystal Pharma, Inc.  announces that a recent virology study showed its novel, broad-spectrum influenza PB2 inhibitor CC 42344 exhibits strong antiviral activity against the highly pathogenic H5N1 avian influenza A strain (A/Texas/37/2024).On March 25, 2024, the highly pathogenic avian H5N1 influenza virus was confirmed in a dairy cow in Texas and has continued to spread widely in U.S. dairy cattle, causing a few human cases. There is concern that the H5N1 virus could adapt for human-to-human transmission and potentially result in an influenza pandemic. CC 42344 is a new investigational drug candidate for the treatment of pandemic and seasonal influenza infections. This inhibitor binds to a highly conserved active site of the PB2 protein and inhibits the viral replication process. The Company previously announced the structural and in vitro data of CC-42344 with the purified H5N1 PB2 protein.

The virology study utilized the highly pathogenic H5N1 avian strain (influenza A/Texas/37/2024) and was conducted to test antiviral activity of CC 42344 using Tamiflu  as a reference inhibitor. The data showed that CC 42344 was highly potent against the H5N1 avian influenza virus (EC50, 0.003 µM), approximately 1,000-fold more potent, compared to a refence compound Tamiflu (EC50, 2.69 µM). CC 42344 is currently in development as an oral treatment for pandemic avian and seasonal influenza A infections with initial data showing a favorable safety and tolerability profile.

“We are excited to share these H5N1 results that further validate our structure-based drug discovery platform technology and strengthen our position in developing treatments for influenza infection,” said Sam Lee, PhD, President and co-CEO of Cocrystal Pharma. “These important antiviral data along with the favorable safety profile observed in a Phase 1 study support further clinical evaluation of CC-42344 for pandemic and seasonal flu.”

“We are developing a therapeutic candidate with the potential to address the multibillion-dollar influenza market,” said James Martin, CFO and co-CEO of Cocrystal Pharma. “Influenza is a major global health concern that may become more challenging to treat as highly pathogenic avian viruses emerge and become resistant to approved antivirals. On average, in the U.S. about 8% of the population contracts influenza each season and influenza is responsible for an estimated $11.2 billion in direct and indirect costs annually.”