Disinfection simply means that you are reducing the microbial load on an object. Since this is usually done to render the object less likely to be involved in the transmission of infection, a good disinfection procedure is aimed at specifically reducing the numbers of potentially pathogenic organisms in the context of the use of the object being disinfected.
An object that has been disinfected is less likely to transmit infection that one that hasn't but because there is only a reduction in the number of microorganisms, their is no guarantee.
Sterilisation is absolute. It means that ALL of the microorganisms have either been removed or killed. A sterile object has NO viable microbial cells present.
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