1. Oseltamivir (Tamiflu®) 150 mg. Subjects will drink orange juice (about 10 ounces although the amount may vary slightly based on weight) over 15 minutes. Fifteen minutes after drinking the orange juice, subjects will receive two (2) 75 mg capsules of oseltamivir with 5 ounces of water. Blood samples (1 teaspoonful) to determine the amount of oseltamivir in blood will be collected before the dose and 0.5, 1.0, 1.5, 2.0, 3.0, 4.0, 6.0, 8.0, 10, and 24 hours hours after the dose. Subjects will be allowed to leave the CRC after the 10 hour blood sample is collected and return the following day for the 24 hour sample.