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While I consider myself to be an informed microbiologist, I had never heard the assertion that chewing gum may reduce the incidence of ear infections among children. As we all know from our primary and secondary school educations, chewing gum is frowned upon and in the old days landed some of us detention! Therefore, a piece in today’s NY Times Science Times entitled “Really? The Claim: Chewing Gum Can Prevent Ear Infections piqued my interest.

As most of us parents know, ear infections are common among children and until recently, the majority of doctors prescribed antibiotics to treat them. However, antibiotic treatment frequently does not help much and in some instances can cause unwanted side effects or complications.  According to the information in the article, xylitol—a naturally occurring sugar alcohol sweetener used as a sugar substitute in most chewing gums—exhibits some antibacterial properties.

This led a group of researchers at the University of Toronto to conduct a meta-analysis of the 3,100 healthy children at day-care centers. They found that children who chewed gum (up to five times per day) were 25 percent less likely to develop ear infections. These results suggest that xylitol-containing gums may help to reduce the incidence of ear infections among young children. Obviously, chewing gum up to five times a day is a bit excessive and it is not clear whether smaller amounts of daily xylitol consumption would exhibitive similar protective benefits. As is the case for most scientific investigations, more experiments are necessary!

Until next time...

Good Luck and Good Job Hunting

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I read a post today on Yahoo News entitled “Warning on New Superbugs from S. Asia.” While I initially thought that this article may contain some important news on the real and growing of multiple drug resistant bacterial pathogens, I sadly learned that it was nothing more than an sensationalistic attempt to promote the discovery of a new metallo-beta-lactamase gene bla(NDM-1) in an Indian isolate of Klebsiella pneumoniae, a Gram negative bacterium. The work was performed by a group at Cardiff University in Wales and published almost a year ago in the journal Antimicrobial Agents and Chemotherapy.

There is no question that morbidity and mortality from Gram negative infections is rising and will certainly continue to increase in the future. This is because most of the work in antibacterial drug discovery in the last decade was focused on Gram positive bacteria including methicillin resistant Staphylococcus aureus (MRSA) and vancomycin resistant enterococci (VRE). Although new antibiotics have reached the market for these organisms, they are used judiciously, and mainly as a last resort, because of fears of emerging resistance to them among Gram positive clinical isolates. Unfortunately, developing new antibiotics against Gram negative pathogens as compared with Gram positive bacteria is much more difficult. To that end, no antibiotics of note have been discovered in recent years to treat multiple drug resistant strains of Gram negative bacteria. 

While identification of the bla (NDM-1) gene may be scientifically and biologically interesting, it will likely have little effect on the clinical treatment of Gram negative infections. This is because many Gram negative isolates are already resistant to most beta-lactam antibiotics and consequently these antibiotics are used only sparingly to treat many Gram negative infections. Regardless of the implications of the discovery of the NDM-1, what I find most troubling about the article is its title. It leads uninformed persons to believe that the world is in grave danger and that a pandemic of multiple drug resistant strains of Gram negative bacteria may be imminent.  While infections caused by multiple drug resistance strains of Gram negative bacteria are clearly on the rise, strains carrying the NDM-1 gene will not decimate the world population any time soon! In fact, the authors suggest that these strains may cause some problems in India which “already has high levels of antibiotic resistance.”

There is no doubt that informing people about the growing incidence of multiple drug resistant bacteria is a good thing. Maybe, if enough people get frightened they may be able to induce big pharmaceutical companies—many of which abandoned antibiotic drug discovery and development in the late 90s—to reinvigorate their programs. That said, it is not clear why this story got elevated to a lead story on Yahoo News since the discovery was made almost a year ago—maybe today is a slow news day? Nevertheless, the impending doom and sensationalistic tone of the article suggests that reporters who cover the life sciences need some training in microbiology. This is necessary to insure that the stories that they write about antibiotics are kept in the appropriate context and historical perspective. That said, don’t be surprised today if the sales of antibacterial products increase and the stock prices of biotechnology companies involved in antibacterial drug discovery and development spike!

Until next time...

Good Luck and Good Job Hunting!!!!!!!!!!!

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There are many natural products from animals, plants, fungi and bacteria that possess antibacterial properties. This makes complete sense from an evolutionary standpoint. Therefore, it should comes as no surprise that spices like cinnamon and natural products like honey possess inherent antibacterial properties. Nevertheless, despite my over 30 years as a card-carrying bacteriologist, I always pleased and pleasantly surprised when I learn that a common substance like cinnamon oil has potent antibacterial activity against antibiotic-resistant bacterial pathogens.

A recent study showed that a cinnamon oil solution was capable of killing a variety of nosocomial bacterial pathogens including Streptococcus pneumoniae and methicillin-resistant Staphylococcus aureus (MRSA). Moreover, the cinnamon oil appeared to be as effective as several antiseptics and disinfectants widely used in many hospitals. And, this isn’t the first report on the antibacterial effects of cinnamon oil. In a 2008 study, French researchers showed cinnamon oil solutions of 10% or less were effective against S. aureus, Escherichia coli and several antibiotic resistant strains of bacteria.  Further, there is a precedent for the use of cinnamon-derived products as an antiseptic. In the Middle Ages thieves who stole jewelry from dead bodies and used “thieves oil”—a concoction consisting of cinnamon bark, lemon oil and eucalyptus—rarely got ill. Finally, cinnamon oil when topically applied to the skin is generally safe. However, in some people it can cause an allergic reaction.

This is good news for a country that has grown increasingly obsessed with chemically-based antibacterial soaps and sanitizers whose overuse may actually be selecting for the emergence of strains of multiple antibiotic resistant bacteria. Nevertheless, the use of natural antiseptics like cinnamon and other plant oils as sanitizers may help to reduce the growing incidence of  drug resistance among nosocomial bacterial pathogens.

Until next time....

Good Luck and Remember to Wash Your Hands (with plain soap, not antibacterial-containing products!)

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As an undergraduate at Cornell, I took a course called "Bee Keeping" mostly because it had the reputation of being a  “gut” course (i.e., easy to ace) and I had a passing interest in entomological microbiology. To this day, I will tell you that it is one of the best courses that I have taken in my academic career. It was taught by a practicing bee keeper who maintained hives in Florida during the winter and in Ithaca during the summer (not surprisingly the course was taught in the Spring semester so that his bees could pollinate the local crops).

Not only did we learn a lot about honey bee biology and social insect behavior, we also learned a great deal about honey and its virtues (we even got to sample different types of honey from time to time). One of honey’s lesser known properties is that it is sterile. This is because honey is extremely hygroscopic and has high concentrations of fructose, thereby preventing the growth of bacteria. These properties led me to wonder in those days whether honey would be an effective antibiotic in certain situations. 

Over the next 30 years or so, I had all but forgotten about the possible use of honey as an antibacterial. Then, much to my surprise, I came across a recent Canadian study which suggests that honey may be useful to treat a variety of infections. Apparently, honey is surprisingly effective in treating bacterial biofilms which are increasingly implicated in the etiology of many chronic skin, mucosal and wound infections. Previous studies showed that honey is effective in wound healing. The researchers who conducted the study also suggested that a “honey rinse” might be effective for treating  "stubborn ear, nose and throat infections."

Interestingly, not all of the honey that was tested exhibited potent antibacterial properties. Canadian clover and buckwheat honey didn’t exhibit any antibacterial properties at all. This suggests that the plant nectars that the bees use to make honey might influence the antibiotic properties of various honeys. It is important to note that the results of these experiments are very preliminary and additional studies will definitely be required to support or refute the use of honey as an antibiotic. Nevertheless, I thought the results were exciting and worth mentioning.

Until next time….don't forget to eat your honey!

Good Luck and Good Job Hunting (try beekeeping…its lucrative these days)!!!!!!

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A friend of mine accidentally gashed his leg on an open dishwasher door and thought nothing of it for several weeks until he noticed that the wound wasn’t healing and it hurt really badly. He eventually went to the emergency room at a local, where the ER docs cultured the wound and sent him home with a prescription for oral antibiotics. The antibiotics stopped working several days later and he wound up in another local hospital–this time he was admitted and the spent the next 5 days on a variety of intravenous antibiotics. Despite the treatment (they could not find the right antibiotic combination at first because  they never recultured the wound) his leg turned black from his ankle to his knee and they almost had to amputate. He is back at home now and will be treated with a regimen of iv antibiotics for the next 6 weeks or so. I talked with him last week and I learned that his leg wound is still not completely healed and the infectious disease docs are worried!

My friend almost lost his leg because of a lack of understanding about bacterial infections and antibiotic resistant bacteria and— unfortunately— because of substandard wound care treatment. With this in mind, I am posting what I think are useful tips (from the June issue of the Mayo Clinic Women’s Health Source) about how to prevent, manage and treat wound infections to minimize the emergence and spread of multiple, antibiotic- resistant bacteria.

• Wash your hands: This simple procedure, done properly, remains the best defense. Carry alcohol-based hand sanitizers for times when hand washing isn’t possible.
• Keep personal items personal: Don’t share towels, soap, sheets, razors, clothing or athletic equipment.
• Sanitize linens: If you have a cut or abrasion, wash towels and sheets with hot water and added bleach. Wash gym and athletic clothes after each use.
• Get infections tested: If an infection requires treatment, ask your care provider to take a culture to confirm what bacteria are present before you are given an antibiotic. (Editor’s note: Unfortunately, this is no longer standard practice—most infections are treated empirically which is partly responsible for the increasing frequency of antibiotic resistant bacteria.) If you test positive for a Staphylococcus (Staph) infection, ask that a culture be tested specifically for MRSA in case you need a special antibiotic.
• Use antibiotics appropriately: When you take antibiotics, take all doses even when you start feeling better. Don’t demand antibiotics for viral illnesses; antibiotics don’t work with viruses. Taking too many antibiotics over time could become a detriment because the medication’s effectiveness can be compromised by overuse.
• Use antibacterial products sparingly: Antibacterial soaps and cleaning products probably don’t prevent infections at home and may make these products less effective in hospitals.
• Take precautions in the hospital: Ask all hospital staff and visitors to wash their hands or use an alcohol-based hand sanitizer before touching you. Ask care providers to wipe stethoscopes and other equipment with alcohol. Don’t set food or utensils directly on tables or beds. Make sure that intravenous tubes and catheters are inserted under sterile conditions.

I hope that these tips will help to keep you out of the hospital with potentially life-threatening, antibiotic resistant bacterial wound infections!

Until next time….

Good Luck and Good Job Hunting!!!!!!!!!

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