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 a Social Security pension benefit, you must be at least 62 years old and have a minimum of 40 Social Security credits. A credit is equal to a designated amount of earnings that increases from year to year based on national earnings averages.