Placental Plasmodium falciparum malaria infection: Operational accuracy of HRP2 rapid diagnostic tests in a malaria endemic setting
Open accessAbstract
BACKGROUND: Malaria has a negative effect on the outcome of pregnancy. Pregnant women are at high risk of severe malaria and severe haemolytic anaemia, which contribute 60-70% of foetal and perinatal losses. Peripheral blood smear microscopy under-estimates sequestered placental infections, therefore malaria rapid diagnostic tests (RDTs) detecting histidine rich protein-2 antigen (HRP-2) in peripheral blood are a potential alternative. METHODS: HRP-2 RDTs accuracy in detecting malaria in pregnancy (MIP >28 weeks gestation) and placental Plasmodium falciparum malaria (after childbirth) were conducted using Giemsa microscopy and placental histopathology respectively as the reference standard. The study was conducted in Mbale Hospital, using the midwives to perform and interpret the RDT results. Discordant results samples were spot checked using PCR techniques. RESULTS: Among 433 febrile women tested, RDTs had a sensitivity of 96.8% (95% CI 92-98.8), specificity of 73.5% (95% CI 67.8-78.6), a positive predictive value (PPV) of 68.0% (95% CI 61.4-73.9), and negative predictive value (NPV) of 97.5% (95% CI 94.0-99.0) in detecting peripheral P. falciparum malaria during pregnancy. At delivery, in non-symptomatic women, RDTs had a 80.9% sensitivity (95% CI 57.4-93.7) and a 87.5% specificity (95%CI 80.9-92.1), PPV of 47.2% (95% CI 30.7-64.2) and NPV of 97.1% (95% CI 92.2-99.1) in detecting placental P. falciparum infections among 173 samples. At delivery, 41% of peripheral infections were detected by microscopy without concurrent placental infection. The combination of RDTs and microscopy improved the sensitivity to 90.5% and the specificity to 98.4% for detecting placental malaria infection (McNemar's X(2)> 3.84). RDTs were not superior to microscopy in detecting placental infection (McNemar's X(2)< 3.84). Presence of malaria in pregnancy and active placental malaria infection were 38% and 12% respectively. Placental infections were associated with poor pregnancy outcome [pre-term, still birth and low birth weight] (aOR = 37.9) and late pregnancy malaria infection (aOR = 20.9). Mosquito net use (aOR 2.1) and increasing parity (aOR 2.7) were associated with lower risk for malaria in pregnancy. CONCLUSION: Use of HRP-2 RDTs to detect malaria in pregnancy in symptomatic women was accurate when performed by midwives. A combination of RDTs and microscopy provided the best means of detecting placental malaria. RDTs were not superior to microscopy in detecting placental infection. With a high sensitivity and specificity, RDTs could be a useful tool for assessing malaria in pregnancy, with further (cost-) effectiveness studies.
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RDTs did not outperform LM to detect PCR-confirmed peripheral P. falciparum and P. vivax infections during pregnancy.
“In line with previous findings [41], RDTs did not outperform LM to detect PCR-confirmed peripheral P. falciparum and P. vivax infections during pregnancy.”
Previous research demonstrates near-adequate performance of RDT in febrile pregnant women in Africa.
“This observation is in keeping with previous research that demonstrates near-adequate performance in febrile pregnant women in Africa [41].”
In Uganda, peripheral blood HRP-2-RDT and LM detected most placental infections (histology), and performed best when combined.
“In Uganda, peripheral blood HRP-2-RDT and LM detected most placental infections (histology), and performed best when combined [41].”
In the Congo, HRP-2 RDT were useful for detection of placental infection (according to histology) when used in combination and in presence of fever.
“In the Congo HRP-2 RDT were useful for the detection of placental infection (according to histology) when used in combination and in presence of fever [41], however the combination of RDT and LM results did not further enhance performance during pregnancy in this study (Table 3), and the small sample size of delivery episodes precludes a meaningful sub-analysis by test criteria.”
In studies using both peripheral and placental blood microscopy as references, RDT sensitivity was lower when compared with placental blood microscopy.
“In studies that used both peripheral and placental blood microscopy as references, RDT sensitivity was lower when compared with placenta blood microscopy [10,13,18].”
From Diagnosing malaria in pregnancy: An update (2012) · cites this paper as [18]
RDT had high sensitivity (96.8%) and specificity (73.5%) for diagnosis of P. falciparum malaria among febrile pregnant women in a hyper-endemic region in Uganda, compared with microscopy as the gold standard.
“Nevertheless, it has been observed that RDT had high sensitivity (96.8%) and specificity (73.5%) for the diagnosis of P. falciparum malaria among febrile pregnant women in a hyper-endemic region in Uganda, when compared with microscopy as the gold standard [15].”
From Reliability of rapid diagnostic test for diagnosing peripheral and placental malaria in an area of unstable malaria transmission in Eastern Sudan (2013) · cites this paper as [15]
RDT had a modest level of accuracy (80.9% sensitivity, 87.5% specificity) for detecting placental malaria using peripheral blood at time of delivery in the later study.
“However, it was observed that the RDT had a modest level of accuracy (80.9% sensitivity, 87.5% specificity) for detecting placental malaria using peripheral blood at time of delivery, in the later study [15].”
From Reliability of rapid diagnostic test for diagnosing peripheral and placental malaria in an area of unstable malaria transmission in Eastern Sudan (2013) · cites this paper as [15]
There are few published data on the performance of RDT for diagnosing malaria during pregnancy, especially in areas of unstable malaria transmission.
“While RDT have been extensively evaluated in malaria among the non-pregnant population, there are few published data on the performance of RDT for diagnosing malaria during pregnancy, especially in areas of unstable malaria transmission [12-17].”
From Reliability of rapid diagnostic test for diagnosing peripheral and placental malaria in an area of unstable malaria transmission in Eastern Sudan (2013) · cites this paper as [15]
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- Authors
- Kyabayinze, D. J., Tibenderana, J. K., Nassali, M., Tumwine, L. K., Riches, C., Montague, M., Counihan, H., Hamade, P., Van Geertruyden, J.-P., & Meek, S.
- Affiliations
- Malaria Consortium (UG)
- London School of Hygiene & Tropical Medicine (GB)
- Mbale Hospital (UG)
- Malaria Consortium (GB)
- Corresponding author
- Kyabayinze, Daniel J
- Venue
- Malaria Journal
- Published
- 2011-10-18
- Volume
- 10
- Issue
- 1
- Pages
- 306-306
- ISSN
- 1475-2875 (ISSN-L)
- PMC
- PMC3206496
- OpenAlex
- W2154122903
- Cited by
- 42
- References
- 49
- Citations by year
- 2025: 5 · 2024: 2 · 2022: 5 · 2021: 2 · 2020: 1 · 2019: 2 · 2018: 4 · 2017: 2 · 2016: 3 · 2015: 4 · 2014: 3 · 2013: 6 · 2012: 3
- FWCI
- 3.76
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Malaria Journal (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Greater South Information System
- Funders
- Department for International Development
- Topics
- Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Malaria Research and Control
- Health Sciences › Medicine › Genetics › Hemoglobinopathies and Related Disorders
- Health Sciences › Medicine › Physiology › Clinical Laboratory Practices and Quality Control
- Keywords
- placental malaria, Plasmodium falciparum, malaria in pregnancy, diagnostic accuracy, placental pathology, febrile malaria, pregnancy outcomes, malaria-endemic settings, perinatal mortality
- MeSH terms
- Adolescent, Adult, Antigens, Protozoan, Blood, Diagnostic Tests, Routine, Female, Humans, Microscopy, Placenta Diseases, Plasmodium falciparum, Pregnancy, Pregnancy Complications, Infectious, Sensitivity and Specificity, Protozoan Proteins, Malaria, Falciparum, Clinical Laboratory Techniques, Young Adult
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