Exactly, it was common sense for medical examinations at school to happen collectively. All boys naked side by side while the doctor searched for any obvious sign of illness. Such practice is very inappropriate these days; Besides the individuality issues, it was a superficial examination with a very poor predictive value. It happened to me at school and in the army when I was older.
Unless it's a public health emergency, we have better practices to screen a particular population for a specific illness.
Besides the ethical and best practices of medicine, it's hot to see these images.
For the sake of fantasies.
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I have restored this old picture a couple of years ago.