The results showed that on day 7 after the first vaccination, the levels of sIgA in the trachea wash fluids from the MLP-2H,MLP-2M,and MLP-2Lgroups were
The results showed that on day 7 after the first vaccination, the levels of sIgA in the trachea wash fluids from the MLP-2H,MLP-2M,and MLP-2Lgroups were