However, should your child appear to be in severe pain, or if you notice rapid spread of the rash with fever, you should seek medical attention. (webmd.com)
For cats, approximately 90 % are malignant with rapid spread to adjacent glands and the nearest set of lymph nodes. (vin.com)
Two distinct and interesting perspectives on the sudden appearance and rapid spread of severe acute respiratory syndrome in 2003. (science.sciencemag.org)