How did the use of handkerchiefs spread disease?
The use of handkerchiefs in the past as a common way to sneeze or cough into can spread disease because the fabric can harbor germs and bacteria. When a person uses a handkerchief to cough or sneeze into, the germs can remain on the fabric until it is washed. If the person then touches their face or other surfaces before washing their hands, they can transfer those germs and potentially spread disease to others.
Additionally, when a person uses a handkerchief to blow their nose, the mucus and other bodily fluids can also contain germs and bacteria. If the person then puts the handkerchief back into their pocket or purse without washing it, they can spread those germs to other surfaces or objects that come in contact with the handkerchief.
Overall, the use of handkerchiefs as a way to contain coughs and sneezes can inadvertently contribute to the spread of disease if proper hygiene practices are not followed.