How do the Thai air-traveling authorities determine if someone must be assigned a special seat reserved for at-risk passengers in the plane?

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I read this quote from a flyer by the PR Thai Government Facebook page summarizing CAAT and airport authorities' new rules and measures:
- Special seats must be reserved for at-risk passengers on routes longer than 90 minutes, to minimize contact between passengers.
(source)
How do the Thai air-traveling authorities determine if someone must be assigned a special seat reserved for at-risk passengers in the plane? In other words, when is a passenger regarded as high-risk?
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Airline Law and Regulation: A Brief History [POLICYbrief]
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Daniel Frese, Pixabay, Tim Gouw, Andrea Piacquadio