Serious adverse reactions to vaccinations include persistent vomiting or diarrhea, skin rash, swelling around the face, severe coughing, difficulty breathing, collapse and autoimmune disease. (mnn.com)
In most cases, this will mean that the pet must be eating and drinking voluntarily without persistent vomiting. (thesprucepets.com)
This includes persistent vomiting and diarrhea which may be bloody. (onegreenplanet.org)