Antibiotic resistance

Antibiotic resistance is a type of drug resistance where a microorganism is able to survive exposure to an antibiotic. While a spontaneous or induced genetic mutation in bacteria may confer resistance to antimicrobial drugs, genes that confer resistance can be transferred between bacteria in a horizontal fashion by conjugation, transduction, or transformation. Thus a gene for antibiotic resistance which had evolved via natural selection may be shared. Evolutionary stress such as exposure to antibiotics then selects for the antibiotic resistant trait. Many antibiotic resistance genes reside on plasmids, facilitating their transfer. If a bacterium carries several resistance genes, it is called multidrug resistant (MDR) or, informally, a superbug or super bacterium.

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'Pig MRSA' Came From Humans, Evolved Via Farm Drugs | Wired Science | Wired.com

2 months ago

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A nasty strain of drug-resistant bacteria called MRSA originated in humans but jumped to pigs on farms. There, it acquired a raft of resistance -- and then jumped back to humans, according to a new study. Superbug blogger Maryn McKenna reports.

Antibiotic resistance

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'Pig MRSA' Came From Humans, Evolved Via Farm Drugs | Wired Science | Wired.com