Tackling Antibiotic Resistance

Author: Inez Cornell
|
Date: Nov 17, 2017

Antibiotic resistance

When the parents of two-year old Braxe found out that his recurring ear infection was caused by the life-threatening superbug MRSA, they were understandably shaken by the news.

Luckily, when doctors took a chance on a new drug, he was cured but not everyone faced with antibiotic resistance is as fortunate.

Antibiotic resistance kills an estimated 700,000 people each year and has fuelled the re-emergence of illnesses that had become a rarity in many parts of the world. Now we are in the midst of a tuberculosis epidemic and multi-drug resistant TB has been declared a public health crisis by the World Health Organisation (WHO). While the treatment of gonorrhea with last resort antibiotics has failed in at least 10 countries, including the UK.  

We are at risk of losing the many benefits antibiotics have given us, including a longer life expectancy and the ability to perform complex surgery and survive deadly infections. The UK’s chief medical officer Dame Sally Davies has warned of the spectre of a “post-antibiotic apocalypse”.

Raising awareness

Although antibiotic resistance is inevitable, thanks to bacteria’s ability to rapidly evolve, it has been made worse by the misuse of antibiotics. An estimated 50 percent of antibiotics worldwide can be bought without prescription. They can be bought on black markets in areas like South America and Asia and are even available over the counter in some parts of the world.

Education about antibiotic misuse is just one aspect of dealing with the resistance problem. Avoiding catching and spreading bacterial infections, by taking measures such as washing hands and being vaccinated, also play a vital role in combatting antibiotic resistance.

This week, the World Health Organisation is running World Antibiotic Awareness Week which will be followed by European Antibiotic Awareness Day on November 18. In the run up to this year’s campaign, the WHO has called for antibiotics not to be used in healthy animals being reared for food.

Many governments and organisations are also collaborating to tackle antibiotic resistance. Public Health England’s Antibiotic Guardian campaign calls on members of the public, health professionals and scientists to make a pledge to play their part in combating resistance. One of the pledges scientists can make is to participate in collaborative research into antibiotic resistance .

A new model for drug development

Many already recognise that scientific collaboration is important to overcoming the challenges involved in creating new antibiotics. A wide array of expertise is needed to tackle the problem.

Bacteria have acquired resistance to nearly all antibiotics that have been developed to date. The development of new antibiotics has steadily decreased in the past three decades and now resistance is on the rise faster than we can develop new treatments.

According to the Association of the British Pharmaceutical Industry, it takes over 12 years and costs £1.15 billion to do all the research necessary to gain the licence for a new medicine. Many agree that this archetype for drug development is inadequate when it comes to developing antibiotics.

They want the regulatory process to make it easier to bring new drugs to market more quickly. Among the proposals put forward to enable this is one by the Infectious diseases society of America (IDSA) which proposed limited approvals similar to those used for orphan drugs used to treat rare diseases.

In the US, a Generating Antibiotics Incentive Now (GAIN) Act passed in 2012 made it possible for some drugs for serious or life-threatening infections to receive priority review. The GAIN Act also made provisions for companies to get an additional five years of patent protection for certain drugs.

The nature of bacterial infections also makes it hard to design clinical trials. It is often hard to accurately diagnose a bacterial infection and therefore identify enough appropriate patients to participate in a clinical trial. What’s more, most infections are acute rather than chronic so patients may naturally recover during the course of the trial.

The short-lived nature of bacterial infections also creates economic challenges for pharmaceutical companies because it is difficult to recoup the investment put into developing the drug. And of course antibiotics are meant to be used sparingly too. A report by the Office of Health Economics in London found that the net present value of a new antibiotic is $5 million compared to $1 billion for a neuromuscular drug.

To tackle antibiotic resistance, far greater investment is needed. A review in the Lancet said tackling antibiotic resistance needs investment somewhere between the Large Hadron Collider, which cost approximately £6 billion, and the International Space Station, which cost £96 billion.

Antibiotic Research UK has proposed setting up a UK Discovery Fund with contributions from the government, medical charities and the pharmaceutical industry. In return for their contribution, pharmaceutical companies would be reimbursed for their efforts.

They also called for the UK government, medical research charities, the pharmaceutical industry, academics and the public to form an alliance to take on antibiotic resistance. One of the actions of the alliance would be to introduce five new antibiotics for gram-negative bacteria, which are particularly problematic because they rapidly become resistant.

CARB-X (Combating Antibiotic Resistant Bacteria), a global collaboration between academia, industry and government is already taking on the search for new antibiotics against gram-negative bacteria.

CARB-X is an innovative project which has $455 million in funding from the Wellcome Trust and BARDA (Biomedical Advanced Research and Development Authority). Their mission is to “accelerate a diverse portfolio of at least 20 high-quality antibacterial products towards clinical development.” In their 2016-17 annual report, they said they have eight new classes of antibiotics in the pipeline.

Novel approaches

But not all the research geared towards tackling antibiotic resistance is focussed on developing new drugs. Some researchers are looking at alternatives to antibiotics like pre and probiotics. A recent review into such alternatives concluded that they are likely to be used preventatively, unless a large investment is made to allow them to be developed into therapies.

Another interim solution being explored is the use of antibiotic resistance breakers (ARB) which involves co-administering a non-antibiotic drug with a failing antibiotic. This week, the pharmaceutical company Helperby Therapeutics announced they have developed an ARB which allows the tough cell wall of superbugs to be punctured to let in last-resort antibiotics.

Conclusion

Tackling antibiotic resistance will take a concerted effort and multiple approaches. It doesn’t matter whether you are a member of the public, or a researcher, you can play a part.

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