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What are antibiotics ?...

What are antibiotics ?

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(i) Antibiotics are medicines obtained from bacteria and fungi .
(ii) They are used to control human and animal diseases.
(iii) Antibiotics like penicillin , cephalosporins, erythromycin , gentamycin , neomycin , tetracyclins, etc. are used against various strains of gram positive and gram negative bacteria .
(iv) Example : Rifamycin is effective against tuberculosis.
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