Microorganisms and Disease
Mucus helps in protecting against pathogens by

blocking access and attachment of pathogens to mucosal surfaces
facilitating the growth of normal flora
lowering the pH
sequestering Iron

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Microorganisms and Disease
Plastic implants can pose a serious nosocomial infection problem because

All of these
phagocytes have trouble engulfing bacteria embedded in a biofilm
infected implants usually have to be surgically removed
phagocytes have trouble moving on the plastic surface

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Microorganisms and Disease
What is common in catheters and ventilators?

They are used primarily in neonatal intensive care units
They predispose patients to viral rather than bacterial infections
They bypass important defenses of the body
Bacteria responsible for associated infections are usually susceptible to antibiotics

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