The first of this two-part series looks in detail at how antibiotic resistance affects the treatment of different types of illnesses — those that attack the gut (such as salmonella or cholera) and respiratory system (such as the tuberculosis bacterium), and the bacterium that causes gonorrhoea.  Treating these diseases in developing countries is increasingly difficult because the cheap antibiotics that were once effective are growing to be useful against bacteria that have developed resistance. These changes are pushing up treatment costs in developing countries. Drug-resistant tuberculosis, for example, is more expensive to treat than the non-drug-resistant type.

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