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Prevalence and importance of congenital cytomegalovirus infection in three different populations
Insights
Maternal immunity to cytomegalovirus (CMV) infection appears to reduce severe fetal infection risk, even if it doesn't prevent intrauterine transmission. Congenital CMV was less fatal in newborns from immune mothers.
Area of Science:
- Virology
- Immunology
- Neonatal Health
Background:
- Cytomegalovirus (CMV) is a common viral infection with varying prevalence and impact globally.
- Congenital CMV infection can lead to significant neonatal morbidity and mortality.
- Understanding the role of maternal immunity in congenital CMV outcomes is crucial for public health.
Purpose of the Study:
- To compare the prevalence of congenital CMV infection and its impact on neonatal mortality between a Chilean population and low-income versus middle/upper-income populations in Birmingham, Alabama.
- To investigate the relationship between maternal seroprevalence and the incidence and severity of congenital CMV infection.
Main Methods:
- Comparative study analyzing congenital CMV infection rates.
- Review of neonatal autopsy data to determine causes of death.
- Seroprevalence assessment in different population groups.
Main Results:
- Higher congenital CMV infection rates (1.7-1.9%) were observed in highly seroimmune populations (Chilean and low-income Birmingham) compared to a less immune group (0.6% in middle/upper-income Birmingham).
- Cytomegalic inclusion disease was not attributed to any neonatal deaths in Chile.
- In Birmingham, CMV caused 1% of neonatal deaths (9 out of 938 infants).
Conclusions:
- Maternal immunity to CMV, despite not fully preventing intrauterine transmission, significantly reduces the risk of severe fetal infection and neonatal death.
- Population-level seroprevalence influences the clinical impact of congenital CMV infections.
Abstract:
A Chilean population was compared to low-income and middle/upper-class populations in Birmingham, Ala., with regard to prevalence of congenital cytomegalovirus infection as well as the importance of this infection in neonatal deaths. In the highly seroimmune Chilean (98%) and low-income Birmingham (82%) groups, congenital infections occurred more often (1.7% and 1.9%, respectively) than in the less immune (56%) middle/upper-income group in Birmingham (0.6%). In 407 autopsies reviewed in Chile no neonatal deaths were attributed to cytomegalic inclusion disease, whereas in Birmingham cytomegalovirus was the cause of death in nine of 938 (1%) newborn infants. These findings further support the concept that, despite an apparent lack of protection against intrauterine transmission, maternal immunity reduces the risk of severe fetal infection.