In 2023, the BioWorld Infectious Disease Index (BIDI) concluded with a 43.48% decline, showing improvement from the 83.57% drop observed in 2022. While an uptick was seen from October's year-to-date performance, down 47.98%, BIDI still lagged both the Nasdaq Biotechnology Index and the Dow Jones Industrial Average for the year, which saw gains of 3.74% and 13.7%, respectively.