In a population of 5000, incidence of disease is 100 in 1 year duration of disease studied for is 2 years calculate Prevalence –
**Core Concept**
Prevalence is a measure of the total number of cases of a disease present in a population at a specific point in time or over a defined period. It is calculated by dividing the number of individuals with the disease (incidence over the study period) by the total population at risk.
**Why the Correct Answer is Right**
To calculate prevalence, we need to know the incidence of the disease over a specified period (in this case, 2 years) and the population size. The incidence of the disease is given as 100 cases in 1 year, so for 2 years, the incidence would be twice that, i.e., 200 cases. The population size is given as 5000. Therefore, the prevalence would be the number of cases present at any given time (200) divided by the total population (5000).
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided, so we'll start with **Option B**.
**Option B:** This option is not relevant to the question, which asks for the calculation of prevalence based on incidence and population size.
**Option C:** This option is not provided, so we'll move to **Option D**.
**Why Each Wrong Option is Incorrect (continued)**
**Option D:** This option is not provided, so we'll move to the correct answer.
**Clinical Pearl / High-Yield Fact**
Remember that prevalence is a measure of the total number of cases of a disease present in a population at a specific point in time or over a defined period, and it can be calculated using the formula: Prevalence = (Number of new cases over the study period) / (Population size).
**Correct Answer: C. 200/5000 = 0.04 or 4%**