The Lyme tick
I noted with understanding that the Doubtful News can’t take it anymore. The relentless tsunami sewage slurry of pseudo-science (who says I can’t alliterate?) has worn her down. She is:
currently experiencing a phase in which I can’t seem to bring myself to promote another ridiculous story in the media about a haunted location, scary sounds from the sky, or the latest outrage fueled by ancient superstition. You might call that… jaded. It’s been over four years now of nearly daily effort to keep track of the weird world of woo. It can wear one down when virtually or literally the same thing appears and reappears over and over as if it hasn’t already been passed around a million times.
I sympathize. I have had a touch of SCAM ennui of late. It is a bit due to the repetitiveness of the SCAMs. I still find the variations on the theme of pseudo-sciences curious. It is like infectious diseases where every case has unique and subtle diversity so no two SCAMs are the same. But there are almost 4,000 clinical trials on acupuncture and I would wager that they all have several of the same half-dozen fatal errors. It is like hand hygiene at work. We have known for, oh what, 160 years, that hand hygiene prevents the spread of disease but people still can’t do it right. We know how to do a good clinical trial but the SCAMsters just can’t seem to figure it out.
The ennui is not the seeming futility of the endeavor. I have always been comfortable with futility, secure, as an example, in the knowledge that someday I will be consumed by the bacteria I spent a career killing. Unless, of course, they get me cremated right away. I keep looking for a motto for the SfSBM; I am attracted to “Sisyphus had it easy.” (more…)
It’s that time of year when every day I can expect to see at least one patient with a concern about Lyme disease. In Lyme-endemic regions such as Western Massachusetts, where I practice pediatrics, summer brings a steady stream of children to my office with either the classic Lyme rash (erythema chronicum migrans, or ECM), an embedded tick, a history of a tick bite, or non-specific signs or symptoms that may or may not be due to Lyme disease. Sometimes the diagnosis is relatively straightforward. A child is brought in after a parent has pulled off an engorged deer tick, and there is a classic, enlarging ECM rash at the site of the bite. More often the presentation is less clear, requiring detective work and science-based reasoning to make an informed decision and a diagnostic and therapeutic plan based on the best available evidence. Depending on the story, the plan may include immediate treatment without any testing (as in the straightforward case described above), immediate testing without treatment pending test results, or waiting as we watch and see how a rash progresses before doing anything. An example of this latter course of action would be when a patient comes in with a pink swelling at the site of a new tick bite. In this case, it may not be clear if the swelling is a Lyme rash or simply a local reaction to the bite, a much more common occurrence. The classic ECM rash (an enlarging, red, circular, bull’s-eye rash at or near a tick bite) typically develops 1-2 weeks after a tick bite, but can occur anywhere from 3-30 days later. It then expands and darkens over another 1-3 weeks before fading. This classic rash is not the most common rash of Lyme disease, however, as it occurs in only about 30% of cases. Instead, the rash may be uniformly pink or red (or even darker in the center) without the target-like appearance, or may be a linear rash, expanding outward from the tick bite site. In the case of a patient who comes in with a vague, pink swelling within a day few days of a tick bite, we will typically wait and see what happens to the rash. If it is a local reaction, it will likely resolve within another few days. With Lyme disease, the rash will continue to enlarge and declare itself as an ECM rash. Another unclear and not uncommon situation is when a patient comes in with non-specific symptoms such as fatigue, musculoskeletal pains, and headache. If warranted by the history and the physical exam, we may in this case order Lyme testing. This may not give us an answer even if the patient has Lyme disease, because results are often negative in the first few weeks of the disease. In this case, if symptoms persist or evolve, we will repeat the testing in another few weeks at which point true Lyme disease will test positive and can then be treated. The good news is that the treatment of Lyme disease, particularly in the early, localized phase of the disease, is extremely safe and effective with a 14-day course of antibiotics. The testing is also relatively straightforward, with very good sensitivity and specificity when performed correctly. And this is where the bad news comes… (more…)