People are dying from “super bugs” because our antibiotic arsenal has run dry, leaving the world without sufficient weapons to fight ever-changing bacteria, warn infectious disease researchers at The University of Texas Medical School at Houston.
In the current issue of The New England Journal of Medicine, medical doctors Barbara E. Murray and Cesar Arias evaluate the past, present and future response to preventing and treating “super bugs.”
A “super bug” is an organism that resists antibiotics by either destroying or modifying the medication, creating a barrier to it, or pumping it out of the bacterial cell.
“Most of the public has heard of MRSA (methicillin-resistant Staphylococcus aureus) because it produces the most cases each year. However, they have not heard of other super bugs that can be far worse,” said Murray, co-author and director of Division of Infectious Diseases at the UT Medical School. “The Gram-negative bacteria are the most antibiotic-resistant with fewer treatment options in life-threatening diseases, such as certain forms of pneumonia, bloodstream infections, gastroenteritis and even meningitis.” Gram-negative bacteria can release toxins created by their cell walls into the bloodstream, where it is harder to treat them.
According to a 2004 report, “Bad Bugs, No Drugs,” by the Infectious Diseases Society of America (IDSA), none of the 89 new drugs approved by the U.S. Food and Drug Administration were antibiotics. Murray and Arias say people are also taking antibiotics without prescriptions or not following the prescription as directed. It is those practices that allow the antibiotics to be exposed to a wide-range of bacteria in the body, both good and bad, which gives the bugs an opportunity to find ways to beat antibiotic weapons.
“We have run out of options. The promise of genomics has not panned out. Gene sequencing has not helped us find a better way to fight these bugs,” said Murray, holder of the J. Ralph Meadows Professorship in Internal Medicine at the medical school. Genomics is the study of an organism’s genomes to chart its DNA sequencing.
According to the IDSA’s 2004 report, the research on new antibiotics is simply drying up, in part due to the expense of bringing a new drug to market.
“The pharmaceutical companies, like all other publicly traded industries, must deliver to its shareholders in order to justify their continued investment. The unique nature of antibiotics makes securing investments challenging. Because antibiotics work so well and so fast, they produce a weak return on investment for manufacturers. Antibiotics are commonly prescribed for seven to 14 days,” the report said.
“Academics can’t do it all. Pharmaceutical companies can’t do it all. Everyone needs to work together to address this potential worldwide public health crisis,” said Arias, co-author of the perspective and assistant professor in infectious diseases at the medical school.
Delay in diagnosis is also an issue. Murray said even with advancements, it takes about 48 hours or more from the time a culture is taken to determine what a person may have contracted and to determine what antibiotics are likely to be effective. “It may not sound like a lot of time, but with some of these bugs you have to move quickly to save a patient. You don’t want the bacteria to spread. Research needs to include finding new testing methods,” Murray said.
The Division of Infectious Diseases at the UT Medical School is already working toward solutions. It has now established the Laboratory for Antimicrobial Research, headed by Arias, within the Center for the Study of Emerging and Re-Emerging Pathogens, headed by Murray. The laboratory, which is supported with funding from the National Institutes of Health (NIH), aims to investigate the clinical and molecular aspects of antibiotic resistance, attempting to understand the complex mechanisms by which bugs become resistant to antibiotics and then designing new strategies to combat them.
“We are struggling, really struggling to treat patients around the world. If something isn’t done soon, more and more bugs are going to gain the upper-hand. There are simply not enough new drugs to keep pace with antibiotic-resistant bacterial infections,” Murray said. “We are sounding the alarm, and hopefully the world will hear it.”
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Practical procedures like inserting urinary catheters, central venous catheters, blood tests and intra venous cannula create an entry point for bacteria to enter blood circulation. MRSA is said to be resistant to antiseptics and disinfectants used to decontaminate skin before introducing needle and cannula through skin. Excess hand washings (more than ten times/day) is said to increase bacterial count in the hands of nurses. We are now threatened by six bacteria (ESKAPE).
The number of people dying due these bacterial infections in our hospitals has reached catastrophic proportion and infection is now the third most common cause of death in the world. The evidence available clearly points to poor hygienic practice when staff performs practical procedures and is now proved not associated with dirty hospitals, temporary staff or rapid turnover of patients.
The number of plastic disposable products used in hospital has increased since 1980s. Often two or three devices are used to successfully insert one into the patient’s body or blood vessels. Disposable plastic device manufacturers are talking about safety devices as a major problem. The are aggressively marketing their so-called “Safety devices” despite published data prove the risk of contracting infection due to sharp injury is considerably low.
Contaminated hospital waste accumulated in yellow sharp bins are not removed from the wards every day. These bins are often colonised with bacteria that are transported all around the hospital. Discarded hospital waste is polluting the environment. Some countries discard contaminated hospital waste and syringes in open landfill sites encouraging bacteria and viral spread in the community.
Drugs and antibiotics are essential but the most important fact we need to concentrate is reduction of these bacterial spreading in our community by reducing plastic disposable device used in hospitals and polluting our environment. Unless we stop encouraging bacterial spared, we will not be able to reduce bacterial spread and are likely to bring an end to our medical profession.