1. Mycobacterium tuberculosis - Stops fusion!
Mycobacterium tuberculosis utilizes macrophages for its replication! (It uses the usual killer to expand it's army :O ) How does tuberculosis bacilli survive in macrophages? M. tuberculosis has evolved a number of very effective survival strategies - It inhibits phagosome-lysosome fusion and inhibits phagosome acidification ensuring it's survival inside the macrophage.