Sherlock MS and the Case of the Polite Massacre

This is about antibiotics. Marvellous inventions, life-saving, civilisationally on roughly the same level as hot water and functioning door handles. So I am by no means against antibiotics. That would be as foolish as being against the fire brigade because water ruins carpets. 🚒

But one must look truth squarely in its well-groomed face: in the gut, antibiotics are not always elegant sharpshooters. At times they behave more like a police raid at two in the morning, necessary, yes, but afterwards the chairs are crooked, the neighbours have vanished, and the stairwell smells of trouble for days. 🫖💥

For lay people, I like to translate the crime scene into a more vivid image: your gut is not a crude tube, but a vast ballroom full of dancing microbes. Thousands of species, each with its own role. Some clear up the mess, others produce useful substances, and still others make sure the entire house does not fall into metabolic disrepair. As long as this ballroom is well attended and richly varied, the party runs with astonishing civility. This richness is called diversity. And in this context diversity is not moral decoration, but biological stability. 💃🦠🕺

Then in come the antibiotics. And unfortunately they do not read the guest list very carefully. So the interesting question in this case is not: Do antibiotics work? Of course they do. Thank goodness. The better question is: How long can one still see the upheaval afterwards in the gut?

And this is where matters become disagreeably interesting. People were observed not merely a few days after a course of antibiotics, but over a span of years. And lo and behold: the gut forgets such visits rather less well than one had given it credit for. As expected, the effect was strongest within the first year. That is the moment when even the most absent-minded butler notices that an unusual number of silver spoons have gone missing after the reception. 🍽️

But - and this is the true impertinence of the case - even 1 to 4 years later, and indeed 4 to 8 years later, traces were still visible in the microbial social register. Eight years! In better families one calls that holding a grudge. 🧐

Particularly delicate was the fact that not all antibiotics behaved equally badly. Some antibiotic classes acted in the gut rather like a noisy hunting party in a china shop, others considerably more restrained. In this study, clindamycin, fluoroquinolones, and flucloxacillin were especially striking. These gentlemen left the clearest mark on the ballroom, and by “mark” I mean, of course, a distinctly disagreeable massacre among the microbial guests. Other agents behaved comparatively more discreetly. In other words: not every antibiotic is the same sort of social catastrophe in the gut. 🎯

I can already hear the usual objection from the back of the drawing room: “But the gut recovers, doesn’t it?” Yes. And no. And that is precisely why I was needed. 😌

There was recovery, especially during the first two years after the event. That is the phase in which new guests appear, old ones return, and the ballroom begins to pretend that nobody ever marched across the parquet in boots. But after that, recovery became markedly slower. The gut is not a conjuring hat from which one may endlessly pull rabbits and stability at the same time. Some things return. Some only reluctantly. And some, it would seem, bring very long-lasting breaches of manners in their luggage. 🐇⏳

Scientifically speaking, not decoratively another particularly elegant point was this: apparently it did not even require an entire opera of repeated courses. Even a single course of antibiotics could leave traces in the microbiome years later. One single visit. One single evening. And yet years later still an empty place at the table. That is not hysteria, merely an indication that the gut has an excellent memory for bad guests. 🍷

Why does this matter? Because the microbiome is not some exotic side character lingering in the background making amusing comments about flatulence. It is bound up with metabolism, inflammation, and the general internal housekeeping of the body. Some of the bacteria that tended to increase after certain antibiotics were, in the study, also associated with less favourable metabolic markers, more abdominal fat, more triglycerides, more inflammatory unrest. That does not mean that every course of antibiotics automatically turns into a tragic medical novel. Kindly refrain from folk panic. It means only this: if one remodels the ballroom, one may be changing rather more than the seating plan. 🔥🧠

And that, precisely, was the solution to my case: antibiotics do not merely kill pathogens. Depending on the class, they alter the microbial society of the gut to very different degrees, and those alterations may remain visible for a remarkably long time. Not days. Not merely weeks. Sometimes years. This is not an indictment of antibiotics. It is a plea for style. For restraint. For wise selection. For recognising the difference between necessary and oh, let us just prescribe something. 👑

For medicine is like good manners: one intervenes decisively when needed. But one does not take an axe to the piano merely because one key is sticking. 🎹

I put the tablet back, closed the box, and allowed myself one of those quiet moments of satisfaction that suit me so very well. The culprit was not malice. The culprit was roughness with good intentions. And as so often, it is precisely the most polite interventions that must be dosed with the greatest care.

I do not solve ordinary criminal cases. I investigate those finer crimes in which the crime scene is a gut ballroom and the suspects have Latin names. 🔎🦠 Yours, Sherlock MS