bacteria

• • Prokaryotic unicellular organisms that don't have membrane-bound organelles and are made up of one cell
• • Found everywhere, including soil, air and the human body
• • The majority benefit ur health with only a small portion pathogenic
• • Cause diseases by releasing toxins or damaging host tissue
• • Tuberculosis → caused by bacterium mycobacterium tuberculosis. Enter lungs when a person inhales infectious droplets. Engulfed by macrophages but survive and reproduce making hard layer of dead tissue around macrophage leading to chest pain