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Cytomegalovirus and dual infection in infants
Insights
Cytomegalovirus (CMV) infection in infants can increase susceptibility to other serious infections. Early diagnosis of CMV is crucial, especially in infants with central nervous system abnormalities.
Area of Science:
- Pediatrics
- Infectious Diseases
- Virology
Background:
- Cytomegalovirus (CMV) is a common virus that can cause serious illness in infants, particularly those with weakened immune systems.
- While CMV is known to impact immunity, its role in predisposing otherwise healthy infants to secondary infections is less understood.
Observation:
- Four infants without prior immunodeficiency developed dual infections involving cytomegalovirus (CMV) and a second microorganism.
- These co-infections included herpes simplex virus, Pneumocystis carinii, Haemophilus influenzae meningitis, and Escherichia coli meningitis.
- Initial clinical presentation in these infants was primarily attributed to the secondary pathogen, not CMV.
Findings:
- CMV infection was diagnosed through clinical suspicion or neuroimaging findings (lucent parenchymal defect on CT scan).
- These cases suggest that CMV infection may compromise the immune system, making infants vulnerable to subsequent infections.
- Both human and murine CMV models indicate a potential for suppressed cellular and humoral immunity.
Implications:
- Healthcare providers should consider CMV testing in infants presenting with signs of infection and central nervous system (CNS) abnormalities.
- Early identification and management of CMV may be critical in preventing severe secondary infections in vulnerable infants.
- Further research is warranted to elucidate the mechanisms by which CMV impacts infant immunity and predisposes to co-infections.
Abstract:
In four unrelated infants without underlying immunodeficiency, dual infections with cytomegalovirus (CMV) and another microorganism developed. The patients included the following: (1) a 3-month-old girl with congenital CMV and perinatal cutaneous herpes simplex virus; (2) a 5-week-old girl with CMV and Pneumocystis carinii; (3) a 12-week-old girl with CMV and Haemophilus influenzae meningitis; and, (4) a 2 1/2-month-old girl with CMV and Escherichia coli meningitis. In all four cases, the patient's initial symptoms were referable not to CMV, but to the companion infecting organism. The diagnoses of CMV infection were made, respectively, by a high index of clinical suspicion in the first three cases and on the basis of a lucent parenchymal defect on computerized tomographic scan in the fourth patient. These cases provide additional evidence that CMV infection may predispose to secondary infection. We recommend that infants who have signs of infection and evidence of CNS abnormalities have cultures made for CMV. Both human CMV and experimental murine CMV infections have been associated with suppressed cellular and possibly humoral immunity.