Acquisition of serum isotype-specific and G type-specific antirotavirus antibodies among children in day care centers.
The acquisition of serum antirotavirus antibodies among children in day care centers was monitored through two rotavirus seasons. Twenty-six children were monitored daily for diarrhea and weekly for stool rotavirus excretion through a rotavirus season of infections with serotype G1 and a successive season of infections with both G1 and G3. Sera were collected before and after each rotavirus season and tested for antirotavirus IgA and IgG and for G type-specific blocking antibody. The prevalence of protective serum IgA and IgG titers increased from 36% and 45% before Season 1 to 77% and 96% after Season 2, respectively (P < 0.02 and 0.001). G type-specific antibodies also increased (G1, P < 0.001; G2, P = 0.005; G3, P = 0.003; G4, P = 0.006), including for noncirculating types. Homotypic and heterotypic antibodies increased as the number of rotavirus infections experienced by a child increased. The group of children with two proven infections developed protective isotype-specific and G type-specific antibodies. These results indicate that in first exposures to rotavirus G types, children develop predominantly homotypic antibody. However, as the number of rotavirus infections increase, children develop heterotypic antibody to G types at levels that correlate with broad protection against rotavirus infection and illness, despite exposure to a restricted number of G types.
Department of Microbiology, Faculty of Medicine, University of Chile, Santiago.
M L
ML
O'Ryan
D O
DO
Matson
M K
MK
Estes
L K
LK
Pickering
D000914:Antibodies, Viral / Q000276:immunology*; D002656:Child Day Care Centers; D002675:Child, Preschool; D005243:Feces / Q000821:virology; D006801:Humans; D007124:Immunoenzyme Techniques; D007070:Immunoglobulin A / Q000276:immunology; D007074:Immunoglobulin G / Q000276:immunology; D007132:Immunoglobulin Isotypes / Q000276:immunology*; D007223:Infant; D015995:Prevalence; D012401:Rotavirus / Q000276:immunology* / Q000302:isolation & purification; D012400:Rotavirus Infections / Q000453:epidemiology / Q000276:immunology*; D012698:Serologic Tests
D000914:Antibodies, Viral; D007070:Immunoglobulin A; D007074:Immunoglobulin G; D007132:Immunoglobulin Isotypes