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.
Interest depends on when the EE Bond was issued: 1  EE Bonds issued from May 2005 earn a fixed rate of return. 2  EE Bonds issued from May 1997 through April 2005 earn variable rates based on 90% of the six-month average of 5-year Treasury Security yields.