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Mother-to-child transmission of human immunodeficiency virus
1Department of Immunology, Karolinska Institute, Stockholm, Sweden.
Insights
Identifying infants at risk of HIV infection from their mothers is crucial. Maternal antibody response to specific HIV proteins may indicate a reduced transmission rate, aiding early diagnosis.
Area of Science:
- Pediatric infectious diseases
- Immunology
- Virology
Background:
- Mother-to-child transmission of HIV is a primary cause of pediatric HIV infections, especially in Pattern II countries.
- Accurate early diagnosis in infants is challenging due to maternal IgG transfer, which affects serological testing.
- Identifying risk factors for vertical transmission has been difficult, with no consistent prognostic indicators found.
Purpose of the Study:
- To review current methods for early diagnosis of HIV in infants born to infected mothers.
- To explore potential maternal factors that may correlate with reduced mother-to-child HIV transmission.
- To highlight promising diagnostic techniques for early detection of pediatric HIV.
Main Methods:
- Review of existing literature on HIV diagnosis in infants and vertical transmission.
- Analysis of diagnostic procedures including IgA detection, in vitro lymphocyte antibody production, and polymerase chain reaction (PCR) for HIV DNA/RNA.
- Evaluation of maternal antibody responses to functional epitopes on HIV envelope proteins.
Main Results:
- Current diagnostic methods like IgA detection and PCR are promising but cumbersome for newborns.
- No maternal factors have demonstrated consistent prognostic value for vertical HIV transmission.
- Maternal antibody response to specific HIV envelope protein epitopes, like the principal neutralizing domain, may correlate with lower transmission rates.
Conclusions:
- Early diagnosis of HIV in infants remains a challenge, necessitating improved methods.
- Further research into maternal immune responses could identify protective factors against mother-to-child HIV transmission.
- Understanding maternal antibody profiles may offer insights into reducing the pediatric HIV burden.
Abstract:
Transmission of HIV virus from an infected mother to her offspring is becoming the leading cause of spreading in the pediatric population. This is particularly burdensome in the pattern II countries where HIV infection has reached epidemic proportions and infection rates affect more women of childbearing age than men. During the last few years considerable effort has been directed at defining the optimal methods for identifying infants of HIV-infected mothers who will themselves prove to be infected because conventional serological assessment is impaired due to placental transfer of maternal IgG. At present, detection of specific IgA to HIV proteins, evaluation of autochthonous antibody production in vitro from infants' lymphocytes, and gene amplification of HIV DNA/RNA by polymerase chain reaction are the most promising procedures for early diagnosis within the first 6 months of life. Nevertheless all these techniques are cumbersome when evaluating specimens from the newborn child. Many studies have been performed to identify those maternal factors affecting the risk of vertical transmission. So far, none of them has shown real prognostic value. However, evaluation of maternal antibody response to functional epitopes of HIV envelope proteins such as the principal neutralizing domain, in some epidemiological settings, seems to correlate to a reduced rate of mother-to-child transmission.