It appears (could be mistaken) that the only way people are being cured is through blood transfusions from people who have been previously cured.
Could the govt be bringing in infected people in order to cure them and increase the supply of "good blood" in the U.S.?

If there were a huge breakout in the U.S., there would obviously not be enough "good blood" to go around, but they may be able to stockpile enough for the elite.