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The gross lesions of lungs and superficial inguinal lymph nodes in the challenged pigs at 14 dpc. A, lung of G2446 (type I)-challenged group; B, superficial inguinal lymph node of G2446(type I)-challenged group; C, lung of CP07-401-9 (type II)-challenged group; D, superficial inguinal lymph node of CP07-401-9 (type II)-challenged group; E, lung of control group at 21 dpc; F, superficial inguinal lymph node of control group at 21 dpc
