Figure 2.

Immune response in the serum and milk of sows. (a) Gilts were immunized twice with an inactivated PDCoV vaccine. After eating colostrum for 5 days, piglets were divided into a challenge, mock or monitoring group for each sow. (b) S‐specific IgG antibody responses in sow serums. (c) S‐specific IgG antibody responses in sow milk. (d) S‐specific sIgA antibody responses in sow milk. (e) NA responses in sow serums. Dotted lines represent the cut‐off [Colour figure can be viewed at http://wileyonlinelibrary.com]