A mother brings her 6-week-old infant to the clinic for a well-baby visit. The nurse is reviewing the infant's chart and notes documentation of TORCH infection screening performed after birth. The laboratory results show the presence of IgG antibodies to cytomegalovirus (CMV) but no IgM antibodies. Which interpretation of these findings is most accurate?
- The infant has never been exposed to CMV, and the IgG result is a false positive.
- Both IgM and IgG must be present together to confirm any TORCH infection.
- The infant currently has an active CMV infection requiring immediate antiviral treatment.
- The IgG antibodies indicate a past CMV infection, and the absence of IgM suggests the infection is not recent.