Bug of the Month: You Never See Me Coming

Bug of the Month helps educate readers about existing and emerging pathogens of clinical importance in health care facilities today. Each column explores the Bug of the Month's etiology, the infections it can cause, the modes of transmission, and ways to fight its spread. The pathogen profiles will span bacterial, viral, fungal, and parasitic species.

We encourage you to use Bug of the Month as a teaching tool to help educate health care personnel and start a dialogue about microbiology-related imperatives.

You can spend your entire life eating hamburgers, bacon, pork chops, venison, and steak without giving me a second thought.

In fact, you've probably met me thousands of times already.

I've been quietly hiding inside every bite of mammalian meat you've ever eaten, and for years your immune system ignored me completely.

Then one day everything changed. It wasn't because I became stronger. It wasn't because you ate too much steak. It wasn't even because of dinner.

It was because of one tiny tick bite.

I don't move on my own. I don't crawl, fly, or infect people. Instead, I rely on one of nature's smallest accomplices, the lone star tick. Hidden inside its saliva, I'm introduced into your body during a blood meal. Suddenly, your immune system notices me for the very first time and decides I don't belong there.

From that moment on, you've got a problem.

Your immune system begins making IgE antibodies against me, preparing for the next encounter. The irony is that I've always been in the foods you've eaten. The only thing that changed was your immune system's opinion of me.

I'm patient.

Unlike peanut allergies or shellfish allergies that strike within minutes, I prefer dramatic timing. I'll wait 3, 4, sometimes even 8 hours after you've enjoyed dinner before making my presence known. By then, you've forgotten what you ate, you're asleep, and suddenly you're waking up covered in hives, doubled over with abdominal pain, or rushing to the emergency department wondering why your throat feels tight.

That delay makes me incredibly difficult to recognize.

Researchers have recently discovered I've been far busier than anyone realized. A CDC-supported study found that nearly one-quarter of adults living in states with established lone star tick populations carry antibodies against me. Arkansas led the way, followed closely by Missouri, Virginia, Kentucky, and Tennessee.

But here's my biggest secret.

A positive blood test doesn't mean I've actually ruined your life.

Many people carry antibodies against me and never experience symptoms. Scientists call that sensitization, not disease. That's why experienced clinicians don't diagnose my syndrome from a laboratory result alone. They listen carefully for the story: delayed allergic reactions after eating beef, pork, lamb, or other mammalian products following tick exposure.

I also seem to enjoy the countryside.

People living in rural and suburban communities meet me more often than city dwellers. Older adults encounter me more frequently than younger adults, and men appear slightly more likely to develop antibodies than women. None of that surprises me. The closer you are to brush, woods, and fields where lone star ticks thrive, the easier it is for my tiny chauffeur to introduce us.

Fortunately for you, I'm remarkably easy to prevent. You don't need antibiotics or a vaccine.

You simply need to avoid the tick that delivers me. Protective clothing, EPA-registered repellents, careful tick checks after spending time outdoors, and prompt tick removal all make it much harder for us to meet.

Scientists are still trying to understand why some people develop lifelong food allergies after meeting me, while others carry antibodies without ever becoming ill. They hope future studies will answer that question.

Until then, remember this: I'm not a bacterium, a virus, or even a parasite.

I'm simply a tiny sugar molecule that has convinced your immune system that the cheeseburger you've loved your entire life is suddenly the enemy.

And thanks to one little tick, dinner may never be the same again.

Who am I?

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