CDC Level 4 Travel Alert -- Doing the Math

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The discussion centers on calculating the infection rate per 100,000 for Costa Rica, given its population of 5,094,000 and reported infections. The World Health Organization reported 5,488 infections as of February 11, 2022. To determine the infection rate, the calculation involves dividing the total infections by the population and then scaling it to a per 100,000 basis. The result shows an infection rate of approximately 108 cases per 100,000, which is significantly below the level four threshold of 500 cases. Additionally, a noted peak infection number of 17,000 in the last 28 days translates to an infection rate of 333 per 100,000, still under the level four classification. The discussion also highlights a method of using cross-multiplication for a clearer visual understanding of the calculation process.
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The 4 level system categorizes international destinations at a level four the 28 day infection rate per 100,000 > 500.
The population of Costa Rica is 5,094,000.
The WHO had 5,488 infections for 2/11/2022.
How would you calculate the infection rate per 100,000?
5,094,000 ÷ 100,000 = 51
5,488 ÷ 51= 108 cases, well below the 500 case threshold for a level four.
Of note, the highest infection number I saw in the last 28 days was 17,000, which is 333 per 100,000, still < 500.
Thanks!
The 4 level system categorizes international destinations at a level four if the 28 day infection rate per 100,000 > 500.

The population of Costa Rica is 5,094,000.
 
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veithmoore said:
How would you calculate the infection rate per 100,000?
I would use similar fractions. That may be what you did, but for me it's more intuitive to see the similar fractions visually first:
$$ \frac{5488}{5094000} = \frac{x}{100000} $$
Then just cross-multiply and solve for ##x## :smile:
 
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