Sunday 12 April 2015

Half a minute past midnight - The threat of antibiotic-resistant superbug bacteria

The threat posed to public health by antibiotic resistant bacteria has been well known since the early 1990s however recent reports in the media of potential discoveries of new drugs has given hope that the threat is being mitigated, if not resolved. This is an unduly optimistic and premature belief.

The recent report on Antimicrobial Resistance (AMR) to the UK Prime Minister in December 2014 highlighted that antimicrobial resistant infections currently claim over 50,000 lives each year across Europe and the United States alone. In 15 European countries more than 10% of bloodstream Staphylococcus aureas infections are now caused by methicillin-resistant strains (or MRSA) with some countries now approaching 50%. Drug-resistant tuberculosis prevalence amounted to 480,000 new cases in 2013 worldwide and reported cases of drug resistant malaria have started increasing in South East Asia particularly in Myanmar and Thailand. The death toll from drug resistant malaria is only available as a vague estimate of between 10,000 and 200,000 people worldwide, mainly children. The tough gut-bacteria known as Enterobacteriaceae of which the best known is Escherichia coli (or E-coli) have also been found to have drug-resistant strains. In the United States, currently 4% of Enterobacteriaceae are drug resistant and in Greece it has reached 68% for the strain of Klebsiella.

Research from the United States has found that drug resistant bacteria from cattle has been able to become airborne and move distances for further contamination.

Without effective prophylactic antibiotics to reduce infections, many surgical procedures would become too risky to undertake. Four areas of high-volume medical intervention would particularly be affected: caesarean sections for births; joint replacements; cancer surgical treatment; and organ transplants. In effect modern medicine would be plunged backwards into the pre-antibiotic period.

In early 2015, the discovery of Teixobactin, a small molecule antibiotic was announced in the journal Nature. Teixobactin was found to effectively kill both Staphylococcus aureas and Mycobacterium tuberculosis without the bacteria developing resistance. However this drug has not yet undergone clinical trials involving humans and is at best 5 to 6 years away from this stage of testing. A newer class of drugs termed carbapenems have been in use but a significant number of these remain suspended from development due to economic and regulatory hurdles. Even so carabapenem-resistant bacteria are on the rise.

And what are the causes of this growing health crisis ? Drug development is less than half the problem with over-prescribing/misuse of antimicrobials, and counterfeit/sub-standard drugs being sold over the counter without a prescription being major culprits, particularly in developing countries such as parts of Africa, India, Pakistan and Bangladesh. Researchers have found drug-resistant Enterobacteriaceae in street puddles in Delhi, India and in water samples taken in Pakistan and Bangladesh. Although infection control in hospitals can provide short term solutions, the fundamental need for new discoveries, faster pathways for antibiotics to be available and stricter management of drug access and use remains the pivotal changes needed.

The link to the research findings for Teixobactin is at the link below:
Nature: Teixobactin

The link to the UK report can be accessed at the link below:

Wednesday 1 April 2015

Australia's decline in renewable energy investment

The Clean Energy Council's diagram below shows the strength of the industry and its value to Australia in 2013 but with reports that investment in large scale renewable energy has declined by 88% to $240 milion by the end of 2014, what is the future ? Australia has fallen from 11th in the world ranking for renewable energy investment to 39th.