Microorganisms and Disease
The nature of the poliovirus gives for oral vaccination (satin vaccine) as part of the eradication programme is

live attenuated strains of all three immunological types
small dosage of wild-type live viruses
heat killed virus
formalin-inactivated viruses

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

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

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