Why not Flu tests, Cold tests, RSV tests, pneumonia tests, herpes tests, Dengue tests, Hep A, B, C tests, HIV tests - why just Covid tests? Asking for an inquisitive friend.
Never mind. My friend figured it out. After 5 years of this insanity, the Thai school officials still have an irrational fear of Covid, in other words, the pandemic hyperbole psychologically damaged generations of Thai citizens who will be spitting on test strips the rest of their live in mortal fear of a Sars-flu. Amazing!