北京
The patient, a 29-year-old woman from Lithuania, had been struggling to conceive with her partner for a prolonged period. Despite undergoing two rounds of in vitro fertilization, pregnancy remained elusive, and all gynecological examinations returned normal results, leaving the couple mystified. With a known history of asthma and allergic sensitivities to mold, cat fur and dust, she decided to explore whether her immune system might be sabotaging her fertility. At a specialized medical facility, blood tests uncovered an abnormally high count of eosinophils, a type of white blood cell that typically reacts to allergens. Subsequent skin tests revealed she was also highly sensitive to mites, certain weed and grass pollens, as well as allergens from insects and dogs. Among the triggers, doctors identified an unusually strong reaction to a specific protein called Can f 5, which is present in dog dander and urine. In their case report, the physicians noted that sensitivity to Can f 5 can sometimes cross-react with structurally similar proteins found in human seminal fluid, potentially leading the immune system to mistakenly attack sperm. The case points to a rare but plausible hidden cause of unexplained infertility: a dog allergy that backfires in the bedroom. After the diagnosis, the patient was advised to strictly minimize exposure to dogs and prescribed targeted allergy treatments. The medical team now urges couples facing unexplained fertility challenges to consider unconventional culprits, including environmental allergens that can trigger immunological misfires.
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