We all know that soap and water are the only weapons needed against most viruses that lurk on bathroom surfaces and bedroom floors.
But there are more resistant organisms that can establish themselves on towels and tiles and can even be spread through common changing rooms.
BBC Mundo tells you defects are five of the most common.
It is common to the knuckles, knees, and feet of many young children. These harmless rough bumps are caused by strains of the human papillomavirus.
They can vary in size and shape and sometimes appear in groups.
contagious son. Often they just need mere skin-to-skin contact.
They can also be transmitted through contact with contaminated surfaces, such as locker rooms and areas around swimming pools.
Most go away on their own, but there are treatments for the most persistent cases.
Public health experts have urged rugby players to stop sharing towels, razors and cold baths after a cluster of infections caused by the virus was discovered PVL-MSSA at the British Midland Rugby Club.
Dermatologists say that any close contact sport, including wrestling, can put people at risk of contagion.
the virus PVL-MSSA cause abscesses and boils and in severe cases it can reach the blood and cause generalized infection.
The condition is caused by a strain of the bacteria, known as methicillin-resistant Staphylococcus aureus, or MRSA.
The condition can be treated with antibiotics and close relatives and individuals of anyone with the compromised infection see a doctor.
Also known as herpes gladiatorum because of its link to martial arts, this scabby rash is caused by the herpes virus.
As the virus takes hold, people experience itching and burning sensations on the skin before a series of painful, fluid-filled blisters appear.
Close contact during rugby matches and wrestling matches can cause the blisters to burst and therefore spread to teammates.
Antiviral pills help fight the infection.
Also known as tinea pedis, it is a fungal infection that causes dry, scaly skin on the webs between the toes with an itchy red rash.
It thrives in dark, humid environments and feeds on dead skin tissue, making feet and bathrooms an ideal home for the fungus.
The fungus is normally found near swimming pools, showers and locker rooms.
It spreads very easily and is transmitted through contaminated towels and clothing and surfaces.
Antifungal creams, powders or sprays available in pharmacies are an effective remedy, but medical advice should be sought if it does not cure.
Doctors are often able to diagnose this infection by looking at the pearl-shaped spots that appear on the affected skin. They are not painful, but they can be very itchy.
Although the virus is highly infectious, most people are resistant and symptoms are unlikely to develop even if you come into contact with infected people.
But for those who do not have enough resistance, they can contract it through skin-to-skin contact or by touching contaminated objects such as towels and wipes.
These mollusks tend to disappear on their own.