 Los Angeles, California--Newsfile Corp. - May 12, 2021 - The Schall Law Firm, a national shareholder rights litigation firm, reminds investors of a class action lawsuit against BELLUS Health Inc. BELLUS or the Company NASDAQ: BLU for violations of 10b and 20a of the Securities Exchange Act of 1934 and Rule 10b-5 promulgated thereunder by the U.S. Securities and Exchange Commission.Investors who purchased the Companys securities between September 5, 2019 and July 5, 2020, inclusive... 