In community x (population 20,000), an epidemiologist conducted a prevalence survey in january of 2012 and reported an hiv prevalence of 2.2%. over the next 12 months, the department of health reported an additional 50 new hiv cases between february 2012 and january 2013. the total population stayed constant at 20,000.calculate the incidence rate assuming no hiv-related deaths over the 12-month period. present or describe the formula you used to arrive at your answer. be sure to clearly indicate the numerator and denominator used in your calculation and include an appropriate label for the rate.