What you need to know about a rare disease that could cause serious side effects

Doctors are warning that a rare and deadly disease called melena can affect your health, even in a relatively small area of the world.

The disease, which affects about 20% of the global population, is especially dangerous in people who live near water sources and are already prone to heart and lung problems, such as asthma.

A doctor at the University of Texas Medical Branch in Galveston said the disease could affect a person’s heart and lungs even if they are not exposed to the water.

Melena, also known as cholera, is caused by bacteria in the ocean or by sewage.

It is caused when the bacteria grow into hard, thick, pink or white algae, which can then attach to the skin and lungs.

The algae can grow for up to 20 days before it can infect the body.

Doctors in the U.S. and Canada are working on developing a vaccine that could help prevent the disease.

The U.K.’s National Health Service has also announced plans to help combat the disease, as has Japan.

Doctors are also looking at ways to prevent the spread of the disease by controlling sewage treatment plants.

The World Health Organization has listed the disease as a “major” global health emergency.