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For a given epidemic or pandemic, the average of its estimated death toll range is used for ranking. If the death toll averages of two or more epidemics or pandemics are equal, then the smaller the range, the higher the rank. For the historical records of major changes in the world population, see world population. [3]
The worst epidemics and pandemics have ravaged humanity throughout its existence, but which were the deadliest? Some of the worst epidemics and pandemics in history have doomed whole civilizations ...
For even more international statistics in table, graph, and map form see COVID-19 pandemic by country. COVID-19 pandemic is the worst-ever worldwide calamity experienced on a large scale (with an estimated 7 million deaths) in the 21st century. The COVID-19 death toll is the highest seen on a global scale since the Spanish flu and World War II.
Human infectious diseases may be characterized by their case fatality rate (CFR), the proportion of people diagnosed with a disease who die from it (cf. mortality rate).It should not be confused with the infection fatality rate (IFR), the estimated proportion of people infected by a disease-causing agent, including asymptomatic and undiagnosed infections, who die from the disease.
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It also has cumulative death totals by country. For these numbers over time see the tables, graphs, and maps at COVID-19 pandemic deaths and COVID-19 pandemic by country and territory. This data is for entire populations, and does not reflect the differences in rates relative to different age groups.
The Spanish Flu, the second deadliest pandemic in history after the bubonic plague, along with the aftermath of World War I and ensuing political and social chaos, made 1918 a tough time to be alive.
Graph of herd immunity threshold vs basic reproduction number with selected diseases S will be (1 − q ), since q is the proportion of the population that is immune and q + S must equal one (since in this simplified model, everyone is either susceptible or immune).