** Shares of CSL CSL.AX fall as much as 5.5% to A$255.4, their lowest levels since November 21, 2023

** The biopharmaceutical co has reported half-year net profit of $2.01 billion, lower than analysts' forecast of $2.09 billion

** Co says earnings weighed down by falling immunisation rates in the U.S., its largest market

** About 1.2 million shares change hands, vs the 30-day average of 558,040

** Stock fell 1.8% in 2024

(Reporting by Nichiket Sunil in Bengaluru)

((Nichiket.Sunil@thomsonreuters.com;))