As to floors, the only really clean floor I know is the Berlin lackered floor, which is wet rubbed and dry rubbed every morning to remove the dust. The French parquet is always more or less dusty, although infinitely superior in point of cleanliness and healthiness to our absorbent floor.
For a sick room, a carpet is perhaps the worst expedient which could by any possibility have been invented. If you must have a carpet, the only safety is to take it up two or three times a year, instead of once. A dirty carpet literally infects the room. And if you consider the enormous quantity of organic matter from the feet of people coming in, which must saturate it, this is by no means surprising.