List of human disease case fatality rates. This is a list of human disease case fatality rates (CFRs). A CFR is the proportion of people diagnosed with a disease who die during the course of the disease (Cf. mortality rate). Data are based on optimally treated patients and exclude isolated cases or minor outbreaks, unless otherwise indicated.
If you were born in 1929 or later, you need to work at least 10 years to become eligible for Social Security. The SSA determines eligibility with a system of credits. Basically, you earn up to four credits for every year worked, and you need a total of 40 credits to qualify for Social Security.
To be eligible for Social Security retirement benefits, a worker born after 1928 must have accumulated at least 40 quarters of work in covered employment. A quarter of coverage generally means the three-month calendar quarter. In addition, you must earn at least $1,260 in a quarter (in 2016) for it to count.