A group from Juntendo University etc. has found antibodies (IgG) against the S-protein of the new coronavirus (SARS-CoV-2) from bovine milk whey.
https://www.sciencedirect.com/science/article/pii/S0958694621000303?via%3Dihub
The bovine milk was prepared from New Zealand cows in November 2018 and August 2019, and they discovered the presence of IgG for RBD present in the S-protein of SARS-CoV-2 from the bovine milk whey. The genome sequence of the S-protein is shown below, and the epitope mapping of the IgG shows that RBD is the one. Therefore, IgG enriched from milk whey may show neutralize activity against SARS-CoV-2.
However, this bovine milk whey was milked before the spread of COVID-19, and it is difficult to think that the cows were infected with SARS-CoV-2, and it might have been infected with an unknown coronavirus that shares immunogenicity of SRAS-CoV-2.
