# CDC International 4 Level Travel Notice System Math Calculations

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veithmoore
TL;DR Summary
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.

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.

I would like to travel to Costa Rica next month, but not at a level 4 infection rate.

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