Epidemics like people, and there are certain optimal numbers which make a population more susceptible to the rapid spread of an epidemic disease, such as Ebola or cholera or SARS. While these optimums vary according to specific diseases, in general, the higher the population density, the greater the chance that micro-organisms will make a successful transfer from host to host. This situation is true for both contagious and noncontagious infectious disease. In general, pest populations vary directly with the size of human populations within which they are located.
Outbreaks of certain epidemic diseases may be related to certain controls. According to recent studies of disease history, the great plagues of Europe appear to be associated with high populations in relation to per capita production.
[2006 関西学院大（総合）IIの部分]
epidemics:[n]流行病
epidemic disease:流行性疾患；流行病【疾患】
Ebola (virus) :Ebolaはコンゴ民主共和国北部の川。
cholera:コレラ
SARS(severe acute respiratory syndrome)
micro-organism:微生物 《細菌・原生動物・酵母・ウイルス・藻類など顕微鏡によって観察される大きさの生物》
contagious:接触感染性の；接触伝染性の
infectious (disease):感染性の；感染；感染の【疾患】
plague:ペスト；悪疫
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