Journals / Flora İnfeksiyon Hastalıkları ve Klinik Mikrobiyoloji Dergisi / 1998 / Cilt: 3 - Sayı: 1

Comparison of laboratory methods for detection of Pneumocystis carinii

Pneumocystis carinii tanısında laboratuvar yöntemlerinin karşılaştırılması

Pages
20–25
DOI
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AI Summary & Key Takeaways

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⚡ TL;DR(Too Long; Didn't Read)

As a result, we suggest testing sputum samples by both PCR and IF techniques for detection of P. carinii.

📌 3 Key Takeaways

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Objective & Hypothesis:Detection of P. carinii is increased by the use of polymerase chain reaction (PCR), particularly on spu-tum samples.
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Key Findings & Data:In this study, sputum samples obtained from 30 immunosuppressed patients with respiratory symptoms (12 HIV infected) were tested by standard cytochemical staining (Giemsa and methenamine silver), immunofluorescense (IF) staining and PCR for detection of P. carinii and the results were compared.
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Conclusion & Impact:As a result, we suggest testing sputum samples by both PCR and IF techniques for detection of P. carinii.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Domain Parameters

Abstract

Detection of P. carinii is increased by the use of polymerase chain reaction (PCR), particularly on spu-tum samples. In this study, sputum samples obtained from 30 immunosuppressed patients with respiratory symptoms (12 HIV infected) were tested by standard cytochemical staining (Giemsa and methenamine silver), immunofluorescense (IF) staining and PCR for detection of P. carinii and the results were compared. P. carinii were detected in 4, 8, and 13 sputum samples by cytological staining, IF test and PCR, respectively. Specific amplification bands were obtained in all sputum samples which were positive by both other tests. All tests gave negative results in sputum samples obtained from 5 HIV infected asymptomatic patients. Our observations suggest that PCR results were found to be well correlated with P. carinii pneumonia (PCP) especially in non-HIV infected patients. However, PCR positivity obtained on HIV infected patients could be mis-leading in the diagnosis of PCP without careful clinical evaluation. Positive results obtained by Giemsa sta-ining or IF test confirm diagnosis of PCP with high degree correlation. As a result, we suggest testing sputum samples by both PCR and IF techniques for detection of P. carinii.

Özet

Sitokimyasal ve immünolojik boyama tekniklerinin duyarlılığının düşük olduğu balgam örneklerinde, polimeraz zincir reaksiyonu (PCR) Pneumocystis carinii belirlenme oranını arttırmaktadır. Bu çalışmada, bağışıklık sistemi baskılanmış ve solunum sistemi şikayeti olan 30 hastanın (I2'si HIV ile infekte) balgam örneğinde sitokimyasal boyama (Giemsa ve methenamin gümüş), immünofloresans (IF) boyama ve PCR yöntemleri ile P. carinii sıklığı ve bu yöntemlerin P. carinii pnömonisi (PCP) tanısındaki değeri araştırılmıştır. P. carinii yönünden sitokimyasal boyama, IF ve PCR yöntemleriyle, balgam örneklerinin sırasıyla 4, 8 ve I3'ü pozitif bu-lunmuştur. Sitokimyasal boyama ve IF testinde P. carinii saptanan bütün örneklerde PCR ile özgül amplifikasyon bandı elde edilmiştir. HIV ile infekte S asemptomatik hastanın çalışmaya dahil edilen balgam örnekleri, üç yöntemle de negatif bulunmuştur. Bağışıklığı baskılanmış HIV ile infekte olmayan hastalarda PCR sonuçları PCP ile tamamen uyumlu bulunmakla birlikte HIV ile infekte hastalarda PCR pozitifliğinin tek başına PCP tanısını koymada yanıltıcı olabileceği ve klinik bulgular ile birlikte değerlendirme yapılması gerektiği belirlenmiştir. Giemsa boyama veya IF incelemede elde edilen pozitif sonuç ise yüksek olasılıkta PCP tanısını doğrulamaktadır. Sonuç olarak, balgam örneklerinin P. carinii yönünden incelenmesinde IF ve PCR yöntemlerinin bir-likte uygulanmasını önermekteyiz.

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Cite This Article

TUNCER, S., ERGÜVEN, S., KOCAGÖZ, S., ÜNAL, S. (1998). Comparison of laboratory methods for detection of Pneumocystis carinii. Flora İnfeksiyon Hastalıkları ve Klinik Mikrobiyoloji Dergisi, Cilt: 3 - Sayı: 1, 20–25. https://ajindex.com/articles/224401

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