TY - JOUR
T1 - Molecular Detection of the Carriage Rate of Four Intestinal Protozoa with Real-Time Polymerase Chain Reaction
T2 - Possible Overdiagnosis of Entamoeba histolytica in Nigeria
AU - Efunshile, Michael A
AU - Ngwu, Bethrand A F
AU - Kurtzhals, Jørgen A L
AU - Sahar, Sumrin
AU - König, Brigitte
AU - Stensvold, Christen R
N1 - © The American Society of Tropical Medicine and Hygiene.
PY - 2015/8
Y1 - 2015/8
N2 - Diarrhea remains the second largest killer of children worldwide, and Nigeria ranks number two on the list of global deaths attributable to diarrhea. Meanwhile, prevalence studies on potentially diarrheagenic protozoa in asymptomatic carriers using molecular detection methods remain scarce in sub-Saharan countries. To overcome sensitivity issues related to microscopic detection and identification of cysts in stool concentrates, real-time polymerase chain reaction (PCR) was used to analyze genomic DNAs extracted from stool samples from 199 healthy school children for Entamoeba histolytica, E. dispar, Giardia intestinalis, and Cryptosporidium. Questionnaires were administered for epidemiological data collection. E. histolytica was not detected in any of the samples, whereas Giardia (37.2%), E. dispar (18.6%), and Cryptosporidium (1%) were found. Most of the children sourced their drinking water from community wells (91%), while the majority disposed of feces in the bush (81.9%). Our study is the first to use real-time PCR to evaluate the epidemiology of E. histolytica, Giardia, and Cryptosporidium in Nigeria where previous studies using traditional diagnostic techniques have suggested higher and lower carriage rates of E. histolytica and Giardia, respectively. It is also the first study to accurately identify the prevalence of common potentially diarrheagenic protozoa in asymptomatic carriers in sub-Saharan Africa.
AB - Diarrhea remains the second largest killer of children worldwide, and Nigeria ranks number two on the list of global deaths attributable to diarrhea. Meanwhile, prevalence studies on potentially diarrheagenic protozoa in asymptomatic carriers using molecular detection methods remain scarce in sub-Saharan countries. To overcome sensitivity issues related to microscopic detection and identification of cysts in stool concentrates, real-time polymerase chain reaction (PCR) was used to analyze genomic DNAs extracted from stool samples from 199 healthy school children for Entamoeba histolytica, E. dispar, Giardia intestinalis, and Cryptosporidium. Questionnaires were administered for epidemiological data collection. E. histolytica was not detected in any of the samples, whereas Giardia (37.2%), E. dispar (18.6%), and Cryptosporidium (1%) were found. Most of the children sourced their drinking water from community wells (91%), while the majority disposed of feces in the bush (81.9%). Our study is the first to use real-time PCR to evaluate the epidemiology of E. histolytica, Giardia, and Cryptosporidium in Nigeria where previous studies using traditional diagnostic techniques have suggested higher and lower carriage rates of E. histolytica and Giardia, respectively. It is also the first study to accurately identify the prevalence of common potentially diarrheagenic protozoa in asymptomatic carriers in sub-Saharan Africa.
KW - Adolescent
KW - Carrier State/epidemiology
KW - Child
KW - Cross-Sectional Studies
KW - Cryptosporidium/classification
KW - DNA, Protozoan/isolation & purification
KW - Diarrhea/epidemiology
KW - Entamoeba/classification
KW - Entamoeba histolytica/classification
KW - Entamoebiasis/diagnosis
KW - Feces/parasitology
KW - Female
KW - Giardia/classification
KW - Giardiasis/diagnosis
KW - Healthy Volunteers
KW - Humans
KW - Male
KW - Nigeria/epidemiology
KW - Prevalence
KW - Real-Time Polymerase Chain Reaction
KW - Sensitivity and Specificity
KW - Socioeconomic Factors
KW - Surveys and Questionnaires
U2 - 10.4269/ajtmh.14-0781
DO - 10.4269/ajtmh.14-0781
M3 - Journal article
C2 - 26101274
SN - 0002-9637
VL - 93
SP - 257
EP - 262
JO - The American journal of tropical medicine and hygiene
JF - The American journal of tropical medicine and hygiene
IS - 2
ER -