That’s a great title that I can’t take credit for. A colleague (and regular supplier of papers for blog posts) Dr. Stephen Page send me a paper from the Journal of Clinical Microbiology with a more convoluted title “The Capnocytophaga canimosus isolate that caused sepsis in an immunosufficient man was transmitted by the large pine weevil Hylobius abietis” (Tuuminen et al 2014).

I often talk about the bacterium C. canimorsus, and any mention of it is usually greeted with either blank stares or the "what the heck was that bacterium called?" look. It’s an obscure bacterium that’s found in the mouths of pretty much all dogs, as well as some other species. While it rarely causes disease, when it does, it can kill quickly.

This report is noteworthy from a few standpoints.  One is the source of infection, as it was associated with a pine weevil, an insect. Insects have not been linked C. canimorsus infections in the past, although I’d wager that little is known about their normal mouth microbiotas. The affected person was a 44-year-old sawmill worker in Finland, with no remarkable health problems. That’s important because C. canimorsus infections almost always occur in people without a functional spleen, alcoholics or people with compromised immune systems. He seemed to have none of those risk factors. While this has been reported before, it’s quite rare.

So, should pine weevil bites be added to the list of things that indicate a need for high-risk people to seek medical care? Well, that seems extreme but it shows the unpredictable nature infectious diseases.

Another question, though: where did the insect get the bacterium (i.e. where did the bug get the bug)? Does C. canimorus actually have a much broader host range? Did this insect recently bite a dog in the mouth? Or, did the person have some other form of exposure? The paper’s title is probably more definitive about the source of infection than it should be. He didn’t own a dog or report being bitten, but could C. canimorsus have been inoculated into the bug bite lesion from some other source?

Who knows? Sounds like a good excuse for a field trip to Finland to look at the microbiota of the pine weevil.

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