were based on women between ages of 14 and 45 at the end of 2012, obtained/derived from Department of Health, Government of the District of Columbia. were provided by the Women’s and Infants’ Services Department of MedStar Washington Hospital Center in 2015. HIV 1/2 STAT-PAK package insert. adequate treatment of 2 mg/kg loading dose, + 1 mg/kg/hr times 3 hrs prior to delivery, and ideal body weight of a 64-inch female + 25 lb weight gain during pregnancy = 155 lb or 70 kg. Published cost of AZT is 35.03 for 200 mg (20 mL of 10 mg/mL). Cost of AZT based on 70 kg woman for adequate prophylaxis: (140 mg loading dose + 70 mg/hr × 3 hrs = 350 mg) = 350 mg × $35.03/200 mg = $61.30. data obtained from the Fisher Scientific Website https://www.fishersci.com/us/en/catalog/search/products?keyword=4th+generation+rapid+hiv+test&nav. to 2015 dollars. value was derived from 28 minus 9 from the reference. A 3% discount rate has been applied to indicate a present value. cumulative incidence, or incidence proportion, is the proportion of a initially disease-free population that developed disease during a specified period of time, http://www.cdc.gov/ophss/csels/dsepd/ss1978/lesson3/section2.html. With the annual cumulative incidence available, we derived 12 weeks, 14 weeks, and 26 weeks of cumulative incidences needed in our model by assuming no temporal trend of the risk. of vaginal delivery and Cesarean delivery were the combination of hospital costs and physician costs. The hospital costs were obtained based on the DRG codes and the division, using HCUPnet online tool http://hcupnet.ahrq.gov/. Costs of physician services were based on the Medicare physician fee schedule (https://www.cms.gov/medicare/medicare-fee-for-service-payment/physicianfeesched/) with associated HCPCS codes and the location.