Aspiration pneumonias may develop when:
A) oral fluids containing large numbers of microorganisms are aspirated into the bronchial tree and lungs.
B) periodontal infections alter the local intraoral environment in such a way that the mouth becomes colonized with elevated numbers of respiratory pathogens.
C) the metabolic control of blood sugar levels is hampered by the presence of periodontal infections.
D) both a and b occur.
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