Bengbu Medical College 1 article published in JoVE Immunology and Infection Visualization of Macrophage Lytic Cell Death During Mycobacterial Infection in Zebrafish Embryos via Intravital Microscopy Liangfei Niu1, Cong Wang1, Kaile Zhang1,2, Miaomiao Kang1,2, Rui Liang1, Xiaonan Zhang1, Bo Yan1 1Shanghai Public Health Clinical Center, Fudan University, 2School of Life Sciences, Bengbu Medical College This protocol describes a technique for visualizing macrophage behavior and death in embryonic zebrafish during Mycobacterium marinum infection. Steps for the preparation of bacteria, infection of the embryos, and intravital microscopy are included. This technique may be applied to the observation of cellular behavior and death in similar scenarios involving infection or sterile inflammation.