The Standing Disease.

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Presentation transcript:

The Standing Disease

1

1 2

1 2 4

1 2 4 8

1 2 4 16 8

32 1 2 4 16 8

1 2 4 8 16 32 64 128 256 512 1,024 2,048 4,096 8,192 16,384 32,768 65,536 131,072 262,144 524,288 1,048,576 2,097,152 4,194,304 8,388,608 16,777,216 33,554,432 67,108,864 134,217,728 268,435,456 536,870,912 1,073,741,824 2,147,483,648 4,294,967,296 8,589,934,592 33 steps!

“Eyebrows were raised when the Centers for Disease Control’s model forecast 77 trillion cases if the epidemic went unchecked” – Ben Cooper, 2006

? Reproduction number (R0) Definition: Average number of people an infected person infects at the start of an epidemic

? R0=2 Reproduction number (R0) Definition: Average number of people an infected person infects at the start of an epidemic R0=2

Cases decrease each step ? Reproduction number (R0) R0 measures how quickly an epidemic will take off… R0 < 1 Cases decrease each step

? R0 < 1 R0 > 1 Reproduction number (R0) R0 measures how quickly an epidemic will take off… R0 < 1 Cases decrease each step R0 > 1 Cases increase each step