Protozoa PCR: boon or bane
Colin Pham A and Harsha Sheorey BA St Vincent’s Hospital
Melbourne, Vic., Australia
Email: colin.pham@svha.org.au
B St Vincent’s Hospital
Melbourne, Vic., Australia
Email: harsha.sheorey@svha.org.au
Microbiology Australia 37(1) 46-49 https://doi.org/10.1071/MA16007
Published: 12 February 2016
Abstract
Parasite detection in faeces has traditionally been performed by microscopy, a procedure that is labour-intensive and highly specialised. In addition, identification by microscopy based on morphological features alone is subjective and prone to wide variability. Although enzyme immunoassays (EIA) of high sensitivity have been developed1 they can detect only a limited range of pathogens. Given these factors the introduction of Polymerase Chain Reaction (PCR) into the routine diagnostic laboratory has improved parasite detection rates2. The ability to multiplex has enabled the detection of multiple targets from a single sample and provides an objective alternative to identification by morphology.
References
[1] Vidal, A.M. and Catapani, W.R. (2005) Enzyme-linked immunosorbent assay (ELISA) immunoassaying versus microscopy: advantages and drawbacks for diagnosing giardiasis. Sao Paulo Med. J. 123, 282–285.| Enzyme-linked immunosorbent assay (ELISA) immunoassaying versus microscopy: advantages and drawbacks for diagnosing giardiasis.Crossref | GoogleScholarGoogle Scholar | 16444388PubMed |
[2] Bruijnesteijn van Coppenraet, L.E. et al. (2009) Parasitological diagnosis combining an internally controlled real-time PCR assay for the detection of four protozoa in stool samples with a testing algorithm for microscopy. Clin. Microbiol. Infect. 15, 869–874.
| Parasitological diagnosis combining an internally controlled real-time PCR assay for the detection of four protozoa in stool samples with a testing algorithm for microscopy.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1MXht1WhtLrN&md5=194b9e9c6d9eb424bd98c62fd7ebcbbbCAS | 19624500PubMed |
[3] Slack, A. (2012) Parasitic causes of prolonged diarrhoea in travellers – diagnosis and management. Aust. Fam. Physician 41, 782–786.
| 23210100PubMed |
[4] Stensvold, C.R. (2013) Blastocystis: genetic diversity and molecular methods for diagnosis and epidemiology. Trop. Parasitol. 3, 26–34.
| Blastocystis: genetic diversity and molecular methods for diagnosis and epidemiology.Crossref | GoogleScholarGoogle Scholar | 23961438PubMed |
[5] Gutiérrez-Cisneros, M.J. et al. (2010) Application of real-time PCR for the differentiation of Entamoeba histolytica and E. dispar in cyst-positive faecal samples from 130 immigrants living in Spain. Ann. Trop. Med. Parasitol. 104, 145–149.
| Application of real-time PCR for the differentiation of Entamoeba histolytica and E. dispar in cyst-positive faecal samples from 130 immigrants living in Spain.Crossref | GoogleScholarGoogle Scholar | 20406581PubMed |
[6] Krogsgaard, L.R. et al. (2015) The prevalence of intestinal parasites is not greater among individuals with irritable bowel syndrome: a population-based case-control study. Clin. Gastroenterol. Hepatol. 13, 507–513.
| 25229421PubMed |
[7] Röser, D. et al. (2013) Dientamoeba fragilis in Denmark: epidemiological experience derived from four years of routine real-time PCR. Eur. J. Clin. Microbiol. Infect. Dis. 32, 1303–1310.
| Dientamoeba fragilis in Denmark: epidemiological experience derived from four years of routine real-time PCR.Crossref | GoogleScholarGoogle Scholar | 23609513PubMed |
[8] Barratt, J.L. et al. (2011) A review of Dientamoeba fragilis carriage in humans: several reasons why this organism should be considered in the diagnosis of gastrointestinal illness. Gut Microbes 2, 3–12.
| A review of Dientamoeba fragilis carriage in humans: several reasons why this organism should be considered in the diagnosis of gastrointestinal illness.Crossref | GoogleScholarGoogle Scholar | 21637013PubMed |
[9] Röser, D. et al. (2014) Metronidazole therapy for treating dientamoebiasis in children is not associated with better clinical outcomes: a randomized, double-blinded and placebo-controlled clinical trial. Clin. Infect. Dis. 58, 1692–1699.
| Metronidazole therapy for treating dientamoebiasis in children is not associated with better clinical outcomes: a randomized, double-blinded and placebo-controlled clinical trial.Crossref | GoogleScholarGoogle Scholar | 24647023PubMed |