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According to the report of CDC’s Morbidity and Mortality Weekly report, in the year 2007 , there were 17,883 cases of food borne infections. A number of cases were seen for salmonella with an approximate incidence rate of 14. 92 per 100,000 people. The common infection found was campylobacter with an incidence rate of 12. 79 for every 100,000 people. Finally shigella infection incidence rate was 6. 26 for every 100,000 people. These rates of infections were high in young children under the age of 5 years.
The main causes for catching these bacterial illnesses is due to children riding in a shopping cart near raw meat or poultry, visit to day-care-center, living conditions of a farm or by playing with a pet turtle or any reptile. Prevalence and incidence are inter-related whereas there are different measures to describe the distribution of disease in particular area people. Prevalence measures the number of total cases of a disease in a particular population at a particular period of time.
The incidence measures as to how quickly the new cases of infection are detected whereas prevalence records how many people in total are affected with a particular disease. For example in Africa for every 100 women, 12-13 people are affected with HIV, this is incidence whereas pre-existence of HIV infection was 50% (number of HIV positive women / number of total women being screened. ) which is prevalence rate. An article in Global Campaign News referred that there are “lower than anticipated HIV incidence” Incidence and prevalence rate is calculated in chronic illnesses viz. , diabetes, HIV and other illnesses.