In the Middle Ages, floors were covered with rushes, which acted like a disposable carpet. If it got dirty, it was thrown away. Today, carpets are more permanent and vacuums often miss much of the dirt—and the germs.
Microbiologists have also identified that the air blown from a running vacuum cleaner as one of the five places in the home that has the highest numbers of germs. Other places include dish sponges, washing machines, bathroom toilets during a flush, and kitchen trash cans