During the early part of the twentieth century, a lot of people got sick and even died of tuberculosis. One of the ways to recovery was either a sanatorium or if there wasn't that much money: this hut. You could fit a bed in it and spend day after day in this hut. All four sides could collapse in real nice weather, but you could also leave any or all sides up. The hut could be turned around and that way you could be facing the sun all day. Some people would spend months in this thing (coming back inside during the nights though), even during the winter months when a small heater would be put into the cabin.
Nowadays, tuberculosis is more or less a thing of the past in the Netherlands, although there are still people suffering from it, mostly in the bigger cities. The illness is very infectious and is caused by airborn bacteria. Especially poor people used to suffer a great deal, mainly due to the fact that after contracting the disease they wouldn't have the money to see a doctor or get treatment. At one point (way before WWII), nearly the whole population was infected by TBC, however, most people never suffered or noticed any symptoms. Afterwards, they would be immune, although they would carry the disease with them until they died.
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