Making the world better, one answer at a time. a superbug is a micro-organism that is resistant to most anti-biotics. the superbugs in recent history are imune to all anti-biotics,except one.
Both electronic and paper versions of Series I savings bonds are purchased at face value and earn interest until they are redeemed or reach maturity. You must hold Series I bonds for at least 12 months before redeeming them. Series I savings bonds will continue to earn interest for up to 30 years. They will cease paying interest once they have matured.
Series EE Savings Bonds issue dated on or after May 1, 2005 will earn a fixed rate of interest for 20 years, at which time the bond should have reached it's face value. If the bond has not reached it's face value, the Treasury will make a one time adjustment up to the face value.