lungs showing in human body , colorful

aeruginosa air alveoli alveolus anatomical anatomy bacteria biology body bordetella breathing bronchi bronchitis chest coli concept conceptual cough disease escherichia health human illustration infection internal klebsiella larynx legionella legionnaires lungs man medical medicine microbe microorganism mycrobacterium organ pathogen pathology pertussis physiology pneumonia pneumoniae pneumophila pseudomonas realistic respiration respiratory rod science shaped system trachea tuberculosis whooping