Maryn McKenna

Journalist and Author

New report and recommendations, “Why Infectious Diseases Are a Threat to America”

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I’m still catching up post-ICAAC – and in addition am on the road reporting, again. But I’m trying to keep all y’all informed. (That’s a clue to my destination. Where in the US is “y’all” a single noun and “all y’all” the plural? Hint: It’s the same place where “barbecue” is only made of beef… Oh, OK, I’m in Texas, enough with the quiz already.)

While the ICAAC-IDSA meeting was happening, the very good nonprofit organization Trust for America’s Health released a report that, just in time for the election, proposed a policy framework for emerging infections and infectious diseases generally. “Germs Go Global: Why Emerging Infectious Diseases Are a Threat to America” lists five major, ongoing, under-appreciated threats:

  • Emerging infectious diseases that appear without warning (SARS, H5N1)
  • Re-emerging infectious diseases (measles, pertussis/whooping cough)
  • “Neglected” infectious diseases (dengue)
  • Diseases used as agents of bioterrorism (smallpox, anthrax)
  • Rising/spreading antibiotic resistance.

The report makes a number of important, well-argued recommendations for the next administration to consider. Several concern us particularly:

The U.S. government, professional health organizations, academia, health care delivery systems, and industry should expand efforts to decrease the inappropriate use of antimicrobials in human medicine, agriculture and aquaculture.
The U.S. Congress should amend the Orphan Drug Act to explicitly address infectious diseases like MRSA, or create a parallel incentive system to address the unique concerns in this area.

The entire report is worth reading. (If you’re short on time, there is an executive summary that covers the main points.) I recommend it.

Breaking MRSA news from the ICAAC meeting 1

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There are 15,000+ people at the 48th Interscience Conference on Antimicrobial Agents and Chemistry (known as ICAAC – yes, “Ick-ack”) and 46th Infectious Diseases Society of America Annual Meeting, and at least half of them seem interested in MRSA. At the keynote address last night, Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases at NIH, referred to MRSA as a “global pandemic.”

Here are some highlights — a few of very, very many — from the first two days:

  • MRSA is truly a global phenomenon: Researchers here are reporting on local epidemics in Argentina, Australia, Botswana, Canada, Colombia, Ecuador, Greece, Japan, Nigeria, Peru, South Korea, Sweden and Taiwan.
  • In the United States, USA300 — the virulent community strain that is crowding out all other community strains — continues its dominance. It first appeared in the San Francisco jail in 2001 and now is the only cause of community MRSA infections there. (Tattevin, P. et al. “What Happened After the Introduction of USA300 in Correctional Facilities?” Poster C2-225.)
  • And MRSA continues to demonstrate its protean ability to cause unexpected forms of illness: The number of cases of sinusitis caused by MRSA seen at Georgetown University tripled between 2001-03 and 2004-06. (I. Brook and J. Hausfeld. “Increase in the Frequency of Recovery of Methicillin-Resistant Staphylococcus aureus in Acute and Chronic Maxillary Sinusitis.” Poster C2-228.)
  • Meanwhile, treatment options are shrinking. Hospitalization for vancomycin-resistant pathogens (that is, resistant to vancomycin, the drug of last resort for MRSA) doubled between 2003 and 2005 according to national healthcare utilization databases. (A.M. Ramsey et al. “The Growing Burden of Vancomycin Resistance in US Hospitals, 2000-2005.” Poster K-560.)
  • But, new drugs are beginning to emerge from the pipeline. Early results from a privately held company called Paratek Pharmaceuticals (co-founded by resistance guru Dr. Stuart Levy) showed that their new tetracycline relative PTK 0796 scored as well or slightly better than linezolid (Zyvox) in safety, tolerability and adverse events, and is advancing to a full Phase 3 trial. (R.D. Arbeit et al. “Safety and Efficacy of PTK 0796.” Poster L-1515.)

More as the meeting goes on.

Non-pharm prevention alternative for MRSA skin infections

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Longtime reader and botanical-medicine expert Robyn spotted this new story and study this morning and pointed it out in the comments to a previous post. It’s about a product, but it’s a product with science to back it, so under my rules regarding commercial products, I am moving it up to post status. (Robyn didn’t say, but given the internals of her post I assume, that she has no commercial interest in this. Right, Robyn?)

The product under investigation is an over-the-counter cream called StaphASeptic that contains the natural antimicrobials tea tree (Melaleuca alternifolia) oil and white thyme (Thymus vulgaris — the “white” refers to the preparation not the species) oil, along with the commercial antiseptic benzethonium chloride. That product’s effect on isolates of CA-MRSA was compared against two common OTC first aid creams, one containing the topical antibiotic polymyxin B and the other containing both polymyxin B and the topical antibiotic neomycin.

The authors found that the botanical-containing cream did a better job of killing CA-MRSA in a time-kill analysis, finding specifically that it went on killing longer — up to 24 hours — than the other two creams. The assumption obviously is that this non-antibiotic cream would do a better job of protecting superficial wounds and scrapes from MRSA infection than the antibiotic-containing ones, while presumably not promoting resistance.

But the important question, which Robyn raises, is whether the essential oils are not in fact acting as natural antibiotics, possibly synergistically. Let’s remember that the majority of antibiotics — including, for instance MRSA drug-of-last-resort vancomycin, and its replacement daptomycin — were initially isolated from natural substances (fungi, in both those cases). Overall, however, botanical products receive much less research attention that pharmaceuticals, so their action and their therapeutic potential remain unexplored.

The cite is: Bearden, DT, Allen GP and Christensen JM. Comparative in vitro activities of topical wound care products against community-associated methicillin-resistant Staphylococcus aureus. Journal of Antimicrobial Chemotherapy (2008) 62, 769–772. NB: The research was supported by an unrestricted grant from StaphASeptic ‘s manufacturers, Tec Laboratories Inc., and JM Christensen, of the Oregon State University College of Pharmacy, disclosed a consultant relationship with Tec.

Gram-negatives need love too

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Britain’s Health Protection Agency warns today that the supply of new drugs for resistant Gram-negative infections — Acinetobacter, Pseudomonas, Burkholderia — is in even worse shape that the drug pipeline for MRSA and other Gram-positives.

“Over the last ten years the pharmaceutical industry has significantly invested in antibiotic treatments for bacteria such as Staphylococcus aureus (including MRSA). There is however a big public health threat posed today by multi-resistant gram-negative bacteria and therefore there is an urgent need for the pharmaceutical industry to work towards developing new treatment options to tackle infections caused by these bacteria, in the same way as they did for bacteria like MRSA.” (Dr. David Livermore, HPA press release)

The announcement comes between two important events: the release of the HPA’s annual survey of antibiotic prescribing patterns in England, Wales and Northern Ireland (report .pdf here, 2mb); and the start next week of the HPA’s annual scientific conference, which will have a full-day symposium on resistant infections (agenda here).

Interesting: The meme “MRSA’s taken care of, let’s get on to the gnarly Gram-negatives” has picked up traction in the past few months. While I’d certainly agree with the second proposition — pharmaceuticals for resistant Gram-negatives are the next big task — I reject the first, that the MRSA problem is solved and all we have to do is wait for the drugs to roll down the pipeline. Doesn’t exactly square with all those posters at the last ICAAC and IDSA exploring emerging resistance to daptomycin and other new compounds.

For a full and thoughtful exploration of the Gram-negatives problem, see this recent New Yorker article, written by the inestimable Dr. Jerome Groopman. (True story: When Groopman’s first book came out, I interviewed him by phone – I was working in Atlanta – and wrote a complimentary piece about it. Fast-forward several years, he has at least one more book out, has become a writing rockstar – in addition to being a hugely respected Harvard clinician and professor — and I am doing a journalism fellowship on genomics at Harvard Medical School. I’m standing in line at the Longwood area Starbucks, and I spy Groopman about four people ahead of me. And I’m too shy to say anything. So much for reportorial moxie.)