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Their results also indicate that the four types of antimicrobial drug most commonly used in farm animals to help them gain weight — tetracyclines, sulfonamides, quinolones and penicillins — are also the ones with highest resistance rates.

This has been extended to include synthetic drugs, including sulfonamides and quinolones.

The great contemporary achievement of modern medicine is the technology for controlling and preventing bacterial infection, but this did not fall into our laps with the appearance of penicillin and the sulfonamides.

The situation is particularly acute in Africa, where the number of infections is rising and resistance to older antibiotics, such as penicillin or drugs based on sulfonamide, is growing.

Denmark and Croatia had sulfonamides, Norway had bacitracin, and Pakistan had several types of antibiotics.