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Published on: July 31, 2021
Milk from Brazilian women presents secretory IgA antibodies and neutralizes rotavirus G9P[5]
Simone M R Santos1, Thalita L Ferreira, Virgínia S Quintal
1MD. Laboratório de Imunogenética, Instituto Butantan, São Paulo, SP, Brazil.
Objective:
To verify the presence of anti-rotavirus serotype G9P[5] SIgA and the virus neutralization capacity of milk samples from Brazilian women.
Methods:
SIgA antibody levels reactive to rotavirus G9 were determined in 30 maternal milk samples by enzyme-linked immunosorbent assay (ELISA) using purified virus suspensions. The samples' capacity to neutralize rotavirus G9P[5] was analyzed using the MA-104 cells neutralization assay.
Results:
Great individual variations were observed regarding the SIgA levels and neutralization titers, but all samples showed some G9P[5] neutralizing ability. A highly significant positive correlation was observed between antibody levels and neutralization titers.
Conclusions:
The high correlation between anti-rotavirus antibody levels and neutralizing capacity of the milk samples suggests a possible protective role of these antibodies against infection. These results also support the encouragement of the breast-feeding practice.
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