Which of the following bacterial diseases of the respiratory system can be prevented by vaccine?
Choose one:
A. bacterial sinusitis
B. diphtheria
C. Pseudomonas pneumonia
D. pharyngitis

Facultative intracellular pathogens
Choose one:
A. can live either inside or outside host cells.
B. are killed by fusion of the phagosome with the lysosome.
C. do not require oxygen to survive.
D. live exclusively inside host cells

Biofilms are clinically relevant because
Choose one:
A. they are organized, high-density communities of cells.
B. they coordinate their behavior through cell-cell communication.
C. bacteria in biofilms are more resistant to antimicrobial drugs.
D. they interfere with cytokine production.