Infectious disease stocks stumbled in the early months of 2025, with the BioWorld Infectious Disease Index (BIDI) plunging 17.83% by the end of April, well behind the broader markets. By comparison, the Nasdaq Biotechnology Index slipped just 1.16%, and the Dow Jones Industrial Average declined 4.41%. In 2024, the BIDI ended the year down 6.28%, after hitting a low of -25.12% in late April.