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Diagnosis of HIV infection in children
1Department of Pediatrics, University of California, Los Angeles, School of Medicine, USA.
Insights
Early diagnosis of HIV in infants uses advanced virologic and serologic assays. These methods help determine transmission timing and ensure accurate detection of perinatal HIV infection.
Area of Science:
- Medical Diagnostics
- Virology
- Pediatrics
Background:
- Advances in HIV diagnostics enable sensitive and specific early detection of perinatal infections.
- Understanding transmission timing (in utero, birth, postnatal) is crucial for infant diagnosis.
- Existing algorithms combine assays and specimen timing to define early infection and acquisition timing.
Purpose of the Study:
- To review current diagnostic approaches for perinatally HIV-exposed infants.
- To highlight the utility of various assays in different age groups.
- To address challenges in diagnosing diverse HIV subtypes in developing nations.
Main Methods:
- Virologic assays (HIV DNA PCR, HIV RNA, culture) for infants <18 months.
- Serologic methods (HIV ELISA, immunofluorescence, western blot) for infants >18 months.
- Combination algorithms utilizing assay results and specimen timing.
Main Results:
- Virologic assays effectively diagnose or rule out infection in young infants.
- Serologic assays become reliable after maternal antibody clearance in older infants.
- New assays are needed to address challenges with diverse HIV subtypes.
Conclusions:
- Accurate diagnosis of perinatally HIV-exposed infants relies on age-appropriate assay selection.
- Developing rapid, simple, and inexpensive assays is critical for global use.
- Continued innovation in HIV diagnostics is essential for improved infant outcomes.
Abstract:
Many advances have been made in the area of HIV diagnostics. Commercially available virologic assays are sensitive and specific for the early detection of HIV in perinatal infection. The timing of the transmission of HIV from mother to child (in utero, at the time of birth, or postnatally by breast-feeding) is a critical consideration in the appropriate diagnosis of infants. Several algorithms can be used to define early infection and the potential timing of acquisition of infection that combine different assays and timing of specimens. The use of virologic assays, including HIV DNA PCR and HIV RNA detection methods and culture, can define and rule out infection in infants less than 18 months of age. Serologic diagnostic methods, including HIV ELISA, immunofluorescence, and western blot assays, can be used to diagnose infants more than 18 months of age, when transplacental antibody has disappeared in uninfected HIV-exposed infants. The challenge of the early and accurate diagnosis of perinatally HIV-exposed infants is the use of new assays to detect different HIV subtype infections that are prevalent in developing countries. Rapid, simple, and inexpensive serologic and virologic assays are being developed for worldwide use.
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