Untreated

Tom's bladder burst due to untreated venereal disease.

The bubonic plague has a case-fatality ratio of 30%-100% if left untreated.

Untreated sewage would pollute the rivers.

The threats range from diesel exhaust and unchecked forest fires fouling the air to untreated waste poisoning the water.

We've left the wood untreated as you requested.

HIV infects and destroys the immune system’s CD-4 T-cells, so the body gradually loses its ability to fight off infections, eventually with lethal consequences in untreated individuals.

Trachoma strikes hardest in remote places like these. Water for washing faces is scarce, and medical care is far away. Trachoma begins as a bacterial eye infection. If left untreated, the infection scars the eyelid, turning the eyelashes inward. The lashes rub painfully up against the eyeball with every blink. Over time, the rubbing scars the cornea, clouding vision and leading to blindness.

Data from more than 100 million people aged 30 to 79 in 184 countries showed that more than 700 million people with hypertension, a life-threatening illness, go untreated. Most do so because they are undiagnosed and do not know they have this condition.

Amoebic dysentery is a type of diarrheal disease that affects millions around the globe annually. Passed around by contaminated water, amoebas get into people's intestines, causing bloody diarrhea. If left untreated, these single-cell organisms can eventually perforate the intestines, spread throughout the body and kill the host. As Rose Hoban reports, researchers are learning more about the amoeba's ability to outwit the body's immune system.

Mastitis causes an inflammation of the mammary glands in a cow's udder. The milk from an untreated cow is still relatively safe to drink, but it's full of white blood cells that form unappetizing clots and flakes, and that make the milk go sour more quickly.