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if a person is suffering from common cold which is viral disease and that person is taking antibiotics would not work and would not reduce the severity of that disease and when any person suffer from bacterial infection along with the viral cold then antibiotics will help thats and we knew that antibiotics are category of medicine use to kill only bacterial diseases . 

organ specific infection are those type of disease which targets only an organ . 
e.g. brain fever  ,
tissue specific infection are those type of infection which targets only group of cell or tissue . e.g. malaria which infects Red blood cells ( RBCs ) .
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