Microorganisms and Disease
Type III secretion systems are used to inject "effector" proteins directly into a host cell. Salmonella uses a type III secretion system to help the pathogen to

activate T cells to proliferate and secrete cytokines
survive the acid pH of the stomach
survive within macrophages
secrete LT (heat labile toxin) and ST (heat stable toxin) into the lumen of the intestine

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

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

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Microorganisms and Disease
Prontosil is

an effective antibacterial both in animals as well as in in-vitro cultures
an effective antibacterial when used in animals
not used as an antibacterial agent
an effective antibacterial when used in in-vitro cultures

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