As bird flu cases rise to 31, an additional human infection has been reported in Missouri, raising concerns among health officials. The CDC confirmed two infections in Washington and conducted a thorough investigation into the Missouri case. Blood tests ruled out avian flu among health workers, and while a second person in Missouri caught the virus without exposure to infected animals, authorities emphasized that there is no evidence of human-to-human transmission. Extensive testing continues as officials strive to control the situation, but they have found no indications of the virus spreading between individuals in Missouri. Meanwhile, bird flu remains a significant problem in California.