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Fifty years avoiding penicillin
A label from childhood
Broadcaster Steven Dubner believed he was allergic because his mother told him so, and she had it from the family doctor. Some childhood rash or temperature spike had led the doctor to declare him allergic to the penicillin he had been given, and the cause was likely something else, perhaps a viral infection. His own doctor later urged him to get the label cleared, but it seemed like a hassle, and plenty of modern antibiotics seemed like a fine substitute.
The illness that followed
In 2024 a cough that would not go away turned into months of misery. He could not sleep through the night, he had ferocious night sweats, and his whole body ached. A Z-pack, a short course of azithromycin commonly used for people allergic to penicillin, did not help, and a lung scan found no cancer. Further tests turned up non-group A strep and an inflamed thyroid, the butterfly-shaped gland at the front of the neck, which most likely started releasing hormones in response to the infection.
Cleared and recovered
By then he had been cleared in an allergist's office, with a skin prick test, an intradermal test, and an oral challenge, all negative. Whether penicillin at the start of the illness would have spared him months of suffering is hard to say for sure, though quite possible. He took amoxicillin, his cough gradually died down, his voice came back, and he slept through the night. For the first time in months, he felt human.
Why do viral infections cause rashes?
Many common viruses produce rashes as the immune system fights them, including measles, rubella, and roseola. Roseola typically brings a high fever in young children followed by a rash as the fever breaks. When an antibiotic happens to be on board, the rash appears to follow it. Physicians have long recognized that this timing can falsely implicate the drug.
What does an oral challenge actually show?
An oral challenge gives the patient the actual drug under observation, so it tests the real-world outcome instead of a stand-in marker. Skin tests look for IgE sensitization, which can be absent in people who still react. Challenges are therefore treated as the definitive step in allergy evaluation. A negative challenge means the drug was tolerated, and the allergy label can be removed.
What does the thyroid do when it is inflamed?
The thyroid releases hormones that set the body's metabolic rate. Inflammation can damage its cells and spill stored hormone into the bloodstream, a state called thyroiditis. Excess hormone can bring a racing heart, sweating, and weight loss. Infections, including viral ones, are among the recognized triggers of thyroiditis.
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