The U.S. Department of Agriculture (USDA) has announced that ground beef samples from retail outlets in states with bird flu-positive dairy cows have tested negative for the H5N1 bird flu virus. The USDA also confirmed that dairy products such as cottage cheese and sour cream, as well as retail milk and infant formulas, have shown no signs of the live H5N1 virus. However, genetic fragments of the bird flu virus were found in about 20% of retail milk samples, indicating wider spread among dairy cows than initially thought. Despite this, there's no consumer health concern, and efforts to control the outbreak continue.