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There are many different diseases that could be spread through sharing cups. These diseases could include blood and oral diseases.
People could have different diseases and put their butt on the seat
Diseases can spread by either saliva or licking some one else blood because they could have aids... and if you'd drink there blood... you could get aids because aids are in the blood... and it could by saliva because that's how ray bees spread because ray bees are in the saliva!
In medieval times people were not hygienic and any diseases spread quite quickly throughout the village. Also rats in the sewers carried many diseases and because the sewers were open they could crawl out and pass the diseases to other villagers.
This is a dangerous practice that could spread serious infectious diseases like hepatitis.
People could have different diseases and put their butt on the seat
The people of Columbus' time had no understanding of what causes disease or how diseases are transmitted. As a result, Columbus could not have done anything to prevent the exchange of diseases between the Taino and Europeans.Of course, if he had had modern knowledge of disease, there is a lot that could have been done. But he did not have that knowledge.
No smoking or equipment that could provide a spark for ignition.
Quarantine is important to stop the spread of diseases that could destroy the local animals.
diseases spread after flood because chemicals of factories and dirty thinks mixes into water and as a result choler, typhoid like diseases spread also when the water dries up the pollution is carried through the air which is more harmful.
The same precautions apply to just about any couple. If you change sex partners frequently, or have several sex partners, you should use a barrier methods such as condoms to reduce the risk of sexually transmitted diseases. And in general, you should take precautions against an unwanted pregnancy - it could be condoms as well, or some other contraceptive.
Leprosy along with other diseases affected the poor population the most. But when they became sick they could easily spread it to the higher classes. Since the lower class worked as servants it was easy for them to give it to their masters.