The frightening prospect that even routine operations will be impossible to perform has been raised by experts alarmed by the rise of drug-resistant genes
Scientists attending a recent session of the American Society for Microbiology reported they had uncovered a highly disturbing trend. They revealed that bacteria containing a gene known as mcr-1- which bestows resistance to the antibiotic colistin- had spread round the world at an alarming rate since its original discovery 18 months earlier. In one area of China, it was found that 25% of hospital patients now carried the gene.
Colistin is known as the” antibiotic of last resort “. In many parts of the world physicians have turned to its use because patients were no longer responding to any other antimicrobial agent. Now resistance to its employ is spreading across the globe.
In the words of England’s chief medical officer, Sally Davies:” The world is facing an antibiotic apocalypse .” Unless action is taken to halt the practices that have allowed antimicrobial resistance to spread and routes are found to develop new types of antibiotics, we could return to the days when routine operations, simple wounds or straightforward infections could pose real threats to life, she warns.
That scaring prospect is likely to be the main points of a major international conference to be held in Berlin this week. Organised by the UK government, the Wellcome Trust, the UN and several other national governments, the session will be attended by scientists, health officers, pharmaceutical chiefs and politicians. Its undertaking is to try to accelerate measures to halt the spread of drug resistance, which now threatens to remove many of the major weapons currently deployed by doctors in their war against disease.
The arithmetic is stark and disturbing, as the conference organisers make clear. At present about 700,000 people a year die from drug-resistant infections. However, this global figure is growing relentlessly and could reach 10 million a year by 2050.
The danger, say scientists, is one of the greatest that humanity has faced in recent times. In a drug-resistant world, many aspects of modern medication would just become impossible. An instance is provided by graft surgery. During operations, patients’ immune systems have to be inhibited to stop them rejecting a new organ, leaving them prey to infections. So doctors employ immunosuppressant cancer drugs. In future, however, these may no longer be effective.
Or take the example of more standard operations, such as abdominal surgery or the removal of a patient’s appendix. Without antibiotics protecting children during these procedures, people will die of peritonitis or other infections. The world will face the same dangers as it did before Alexander Fleming discovered penicillin in 1928.
” Routine surgery, joint replacings, caesarean section, and chemotherapy also depend on antibiotics, and will also be at risk ,” says Jonathan Pearce, head of infections and immunity at the UK Medical Research Council.” Common infections could kill again .”
As to the causes of this growing threat, scientists point to the widespread misuse and overuse of antibiotics and other drugs and to the failure of pharmaceutical companies to investigate and develop new sources of general medicines for the future. Western doctors are over-prescribing antibiotics to patients who expect to be given a drug for whatever complaint they have. In many countries, both land and fish farmers use antibiotics as growth promoters and haphazardly pour them on to their livestock. In the latter case the end outcome is antibiotics leaching into creeks and rivers with alarming results, particularly in Asia.
” In the Ganges during pilgrimage season, there are levels of antibiotics in the river that we try to achieve in the bloodstream of patients ,” says Davies.” That is very, very disturbing .”
The creation of these soups of antibiotic-laden water and banks of drug-soaked clays is ideal for the development of “superbugs”. Rare strains that are resistant to antibiotics start to thrive in farm animals that are raised in these artificial environments and emerge as highly potent infectious agents that then spread across the planet with startling speed. Instances of this involves tuberculosis, which was once easily treated but which, in its modern multi-drug-resistant form, known as MDR-TB , now claims the lives of 190,000 people a year.
Another even more uncovering instance are offered by colistin.” Colistin was developed in the 50 s ,” says Matthew Avison, reader in molecular biology at Bristol University.” However, its toxic side-effects built it unpopular with physicians. So it was taken up by vets and used in animals. But as resistance- in humen- to other antibiotics has spread, doctors have returned to colistin on the grounds that it was better than nothing .”
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