The correct spelling is epidemiology. Epidemiology is a branch of medicine dealing with possible diseases, incidence, and distribution relating to health. It is a science that studies causes and effects of disease and health.
There are three main category of epidemology;Endemic is a disease that is constantly present to a greater or lesser degree in people of a certain class or in people living in a particular location; an epidemic is a widespread outbreak of an infectious disease that infects many people at the same time; a pandemic is an epidemic that is geographically widespread occurring throughout a region or even throughout the worl
Yes, the word sleigh is a common noun; a word for any sleigh of any kind, anywhere.A proper noun is the name of a specific person, place, thing, or a title; for example:Professor Adrian Sleigh, National Centre of Epidemology and Population Health, ANU College of Medicine, Biology, and Environment, Canberra ACT, AustraliaSleigh Road, Chelmsford, MA or Sleigh Street, Santa Claus, GAMagic Sleigh of Manchester (holiday shop), Manchester Center, VT"Little Nemo's Wild Sleight Ride", a children's book by Roland Urbanek and Winsor McCay