A Massachusetts pharmaceutical company has filed its second set of suits alleging Pfizer and Moderna violated patents when developing their coronavirus vaccines, nearly doubling the number of vaccine patent infringement claims pending against the two companies in the District of Delaware.

Alnylam Pharmaceuticals is represented in all its pending Delaware litigation by McDermott Will & Emery. The original Alnylam cases each involved one patent issued in February 2022, while the new ones, filed on March 26, claim infringement of several more all issued earlier this year.