molecular diagnostics – Page 2

A case of Blastomyces helicus pneumonia in a dog from a non-endemic region: diagnostic challenges and successful treatment outcome

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A dog from Colorado developed a severe respiratory infection that was initially mistaken for a bacterial pneumonia. After antibiotics failed to help, advanced testing revealed the dog had a fungal infection caused by Blastomyces helicus, a rare fungus found in western North America. The dog was successfully treated with an antifungal medication called itraconazole and made a complete recovery within six months, demonstrating the importance of considering fungal infections when standard treatments fail.

First human case of Eidernor doerrieniae colonization in a peritoneal dialysis catheter: A warning from silent contamination

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A 52-year-old dialysis patient noticed brownish particles inside his peritoneal dialysis catheter. Doctors identified a rare fungus called Eidernor doerrieniae using DNA sequencing, which had never been found in humans before. The catheter was removed and the patient received antifungal medications that successfully eliminated the infection without causing serious complications.

Primary cutaneous mixed infection with Cryptococcus uniguttulatus and Mycobacterium tuberculosis

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A 43-year-old man had persistent facial skin lesions for seven years that initially appeared to be fungal infection caused by Cryptococcus uniguttulatus. Standard antifungal treatments failed to completely cure the condition. Advanced genetic testing revealed the lesions were actually caused by two simultaneous infections: the fungus and tuberculosis bacteria. Once both infections were properly identified and treated with appropriate medications, the skin lesions finally healed.

Epidemiology of Onychomycosis in the United States Characterized Using Molecular Methods, 2015–2024

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This large study examined over 710,000 nail samples to identify which fungi cause nail infections in the United States. Using modern molecular testing combined with microscopic analysis, researchers found that while the fungus T. rubrum is most common, other molds and yeasts cause many infections too. Importantly, women and older adults are more likely to have infections from these other organisms, which are often harder to treat with standard antifungal medications.

An Optimized In-House Protocol for Cryptococcus neoformans DNA Extraction from Whole Blood: Comparison of Lysis Buffer and Ox-Bile Methods

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Researchers developed a simple, low-cost method to extract DNA from Cryptococcus neoformans fungal cells found in blood samples. The new method uses a homemade salt buffer solution instead of expensive commercial kits, making it accessible to laboratories in developing countries. Testing showed this method works better than an alternative ox-bile method, detecting very small numbers of fungal cells. This breakthrough could help doctors more quickly diagnose a serious fungal infection called cryptococcal meningitis in resource-limited settings.

Diagnostic Performance of a PCR-Based Approach for the Diagnosis of Dermatomycosis

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This study evaluated a new testing method combining DNA analysis (PCR) with traditional microscopy and culture to diagnose fungal skin, hair, and nail infections. The PCR method detects the infection quickly and accurately, identifying the specific fungus causing the problem within days rather than weeks. The study of over 4,400 samples found that Trichophyton rubrum was the most common cause of fungal infections, and the combined testing approach was 98.5% accurate while reducing unnecessary lab work.

Onychomycosis in the US Pediatric Population—An Emphasis on Fusarium Onychomycosis

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This study examined nail fungus infections in American children using advanced molecular testing. Researchers found that elementary school-aged children (ages 6-11) have the highest rates of nail fungus, usually caused by common fungi like Trichophyton rubrum. Notably, Fusarium, an environmental fungus that was once rare in nail infections, is becoming increasingly common, especially in older teenagers, which may require different treatment approaches.

The diagnosis of mucormycosis by PCR in patients at risk: a systematic review and meta-analysis

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This study reviews how well a molecular test called PCR can diagnose mucormycosis, a dangerous fungal infection. Researchers analyzed 30 studies covering over 5,000 patient samples and found that PCR works very well for detecting this infection, especially when using samples from the lungs. Blood tests were also effective but slightly less sensitive. The study recommends using PCR as part of updated diagnostic guidelines to help doctors catch this serious infection earlier, potentially improving patient outcomes.

Optimizing a modified cetyltrimethylammonium bromide protocol for fungal DNA extraction: Insights from multilocus gene amplification

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This research improves how scientists extract DNA from fungi found in dried fruits and other sources. The modified CTAB method is faster, cheaper, and produces higher quality DNA than commercial kits, without requiring special equipment like liquid nitrogen. The extracted DNA works well for identifying fungal species and detecting fungal diseases in fish, plants, and humans, making it valuable for both research and medical diagnostics.

John Perfect Shares Insights on Infectious Diseases, Antifungal Therapy, and Drug Resistance

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This interview with Dr. John Perfect, a leading expert in fungal infections, discusses how antifungal treatments have evolved over his 48-year career. He explains that while fungal resistance is a concern, it’s less problematic than bacterial antibiotic resistance because fungi don’t spread resistance through plasmids. Dr. Perfect emphasizes the importance of newer, faster-acting antifungal drugs and combining drug therapy with immune system support to better treat serious fungal infections like cryptococcal meningitis and candidemia.

Research Keyword: molecular diagnostics