Zika Virus IgG in Infants with Microcephaly, Guinea-Bissau, 2016

Area of Science:

• * Infectious disease epidemiology
• * Maternal and child health
• * Virology

Background:

• * Microcephaly is a serious congenital defect impacting infant brain development.
• * Zika virus has been previously associated with microcephaly outbreaks.
• * Understanding pathogen prevalence is crucial for public health interventions in West Africa.

Purpose of the Study:

• * To investigate the presence of Zika virus RNA and IgG antibodies in infants with microcephaly and their mothers.
• * To identify potential infectious causes of microcephaly in Guinea-Bissau.
• * To inform public health strategies for managing congenital abnormalities.

Main Methods:

• * Analysis of blood samples collected in 2016 from infants exhibiting microcephaly and their mothers.
• * Detection of Zika virus RNA using molecular methods.
• * Quantification of Zika virus IgG antibodies via serological assays.

Main Results:

• * Zika virus RNA was not detected in any of the analyzed infant blood samples.
• * A high prevalence of Zika virus IgG antibodies was observed, indicating past exposure.
• * The findings suggest Zika virus may not be the primary cause of microcephaly in this cohort.

Conclusions:

• * While past Zika virus exposure is evident, active infection is unlikely to be the cause of microcephaly in this study.
• * Further research is needed to identify other pathogens responsible for congenital defects in Guinea-Bissau.
• * Implementation of routine pathogen screening for infants with congenital defects is recommended to guide clinical management and public health responses.