Consider the Cider rate ers expect the greatest increases in spring fever? 2. Di

Question

Consider the Cider rate ers expect the greatest increases in spring fever? 2. Diphtheria. Diphtheria is a disease caused by bacteria, and it usually affects the tonsils, throat, nose and/or skin. It is passed from person to person via coughing or sneezing, but it can also be spread by drinking from a glass used by an infected person. In 1878 Sir William H. Powers was investigating an outbreak of diphtheria in Kilburn and St. Johns Wood in England. As part of his early epidemiologic detective wo Powers noticed that if rk, he drew two concentric circles at a particular point-one with a radius of a half-mile, one with a radius of one mile-an interesting pattern to the disease emerged. He studied the data for the inner circle and the outer ring. Here are his data for 15 weeks of observation:

Explanation / Answer

Incidence rate can be calculated by the following equation :

(n / Total population at risk) x 10 n

where n= Total number of new cases of specific disease

inner circle:

no. of households newly attacked

inner circle:

no. of households still at risk

inner circles:

incidence rate

outer ring:

no. of households newly attacked

outer ring :

no. of households still at risk

outer ring:

incidence rate

0.004

Incidence Rate of Disease =

(n / Total population at risk) x 10 n

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