Background Preconceptional immunity against cytomegalovirus(CMV) provides only partial protection against intrauterinetransmission of the virus. Whether congenital CMV infectionin the offspring of women who are seropositive for CMV can occurafter maternal reinfection with a different strain of CMV isunknown.
Methods Serum specimens from 46 women with preconceptional immunityagainst CMV that were obtained during the previous pregnancyand the current pregnancy were analyzed for antibodies againstthe strain-specific epitopes of CMV glycoprotein H. Virus-neutralizingactivity in maternal serum samples was measured against theAD169 laboratory strain of CMV and the CMV isolates availablefrom seven infected infants. In addition, the nucleotide sequencesof the glycoprotein H gene from the seven CMV isolates weredetermined.
Results Eleven of the 16 mothers with infected infants (69 percent)had antibodies against the glycoprotein H epitopes present ontwo laboratory strains of CMV, AD169 and Towne. Ten of the 16mothers with infected children (62 percent) acquired new antibodyspecificities against glycoprotein H, as compared with only4 of the 30 mothers of uninfected infants (13 percent, P<0.001).The samples obtained at the time of the current delivery fromfour of the seven mothers contained at least twice as many neutralizingantibodies against the CMV isolated from their infants as werepresent in the samples obtained at the previous delivery. Thespecificity of the newly acquired maternal antibodies reflectedthe amino acid sequence of the glycoprotein H epitope of CMVfrom these four infants.
Conclusions In women who are seropositive for CMV, reinfectionwith a different strain of CMV can lead to intrauterine transmissionand symptomatic congenital infection.
Source Information
From the Departments of Pediatrics (S.B.B., L.B.R., K.B.F., W.J.B.), Epidemiology (K.B.F.), and Microbiology (S.B.B., W.J.B.), University of Alabama at Birmingham, Birmingham; and the Institute for Clinical and Molecular Virology, University of Erlangen-Nürnberg, Erlangen, Germany (M.M.).
Address reprint requests to Dr. Boppana at the Department of Pediatrics, University of Alabama at Birmingham, 1600 7th Ave. S., Suite 752, Birmingham, AL 35233, or at sboppana{at}peds.uab.edu.
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