Bharat Serum" refers to Bharat Serums and Vaccines Limited (BSV), an Indian biopharmaceutical company specializing in women's health, critical care, and assisted reproductive technology products, whereas "bio" (likely a typo for "Biotech") refers to Bharat Biotech, a different Indian biotechnology firm focused on developing and manufacturing vaccines and bio-therapeutics, including indigenous COVID-19 vaccines. The confusion arises because both are major Indian biopharmaceutical companies.