Cat’s Unexpected Role in Spreading Rare Infection
A woman with a compromised immune system found herself facing an unusual health crisis, all thanks to her cat. A recent report from doctors in Slovenia shares the details of how this feline friend likely transmitted a rare bacterial infection that resulted in her hospitalization.
The report, published in the June issue of Emerging Infectious Diseases, revolves around a 56-year-old woman who had previously undergone a kidney transplant. She developed a serious case of Mycoplasma arginini infection, ultimately traced back to her pet. Fortunately, the doctors recognized her condition in time, allowing for appropriate treatment, and she was able to recover.
The situation began when the woman visited a medical facility after experiencing three weeks of swelling, redness, and pain in her left forearm. Despite being given an oral antibiotic, her symptoms deteriorated. Five days later, she made a return trip, only to find that the swelling had spread to her wrist and hindered her mobility. Tests revealed the infection had permeated the main joint, tendons, and surrounding skin.
The medical team suspected an uncommon germ was at play, and tests soon confirmed the presence of M. arginini bacteria. Mycoplasma bacteria are quite unique; they’re very small, without a cell wall, which allows some strains to invade cells and replicate in a virus-like manner. This peculiarity likely explained the initial failure of the first antibiotic treatment. It’s worth noting that the woman had also been bitten by her cat on her left arm shortly before falling ill.
Once the source of the infection was identified, the medical team switched her to more effective antibiotics. Although she faced some subsequent complications, her condition gradually improved, eventually leading to her discharge. Follow-up visits later confirmed the infection had resolved.
M. arginini bacteria are typically found in the respiratory and genital systems of various animals, including pets. The doctors gathered samples from her three cats and a dog, discovering mycoplasma bacteria in one of the cats, though they couldn’t definitively confirm it was M. arginini. Given the recent cat bite and no other clear causes, the medical team concluded her cat was likely the culprit.
While there are common mycoplasma infections in humans, such as M. genitalium, M. arginini is relatively rare. The doctors found only a few other documented cases in medical literature, most affecting individuals with weakened immune systems. It’s important to note that organ transplant recipients need ongoing immunosuppressive medication, and this woman had undergone two kidney transplants, the latest in 2022. While M. arginini isn’t a major concern for healthy individuals, medical professionals treating immunocompromised patients should be aware of its potential risks, particularly for those with animal exposure.
Cat bites shouldn’t be overlooked since cats can carry various germs that might affect even the healthiest of people. It’s advisable to promptly clean any cat bite or scratch with running water and soap for at least five minutes. It’s also crucial to monitor the area for signs of infection, such as redness or swelling. If these symptoms occur—or if the person is in poor health or was bitten by an unfamiliar animal—seeking medical attention is recommended immediately.
