Image credit All communicable diseases have a number assigned to them that tell scientists and doctors how fast a disease is spreading. This number is always based on past outbreaks to start with and then, as n outbreak continues numbers are produced for the current outbreak. These will be revised as an epidemic continues. Depending on whom you are talking to this number is referred to as the infection rate or the reproduction rate, they are the same thing and can be interchanged in a medical context. The number to remember is 2. The number 2 represents exponential spread in the medical world. A two or higher is very bad news.
Read more about When Officials Say The Infection Rate of Ebola is 2 Be Afraid, Be very Afraid
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