402 DISEASES OF UNCERTAIN ETIOLOGY 



It differs from typical variola because of — 

 (i) Its low mortality, i to 2 per cent. 



"Varioloid varicella," Trinidad. Froia a photo by Dr. Scheult. 



(2) It is less severe in children than in adults; it is often found 

 amongst babies. 



(3) There is no secondary fever in children. 



(4) The disease can occur after recent successful vaccination. 



(5) Vaccination can be successful shortly after an attack of 

 alastrim. 



