Advertisement

Insects, contaminated food and water, sneezing, and unwashed hands are just some of the ways infectious diseases pass from one person to another. Communicable diseases cause significant health risks around the world, and new ones can appear at any time. They may follow a natural or manmade disaster, a bioterror attack, or a migration of groups of people from one geographical area to another. An international gathering could be a starting point for an outbreak. Some communicable diseases are preventable through vaccination; others are not.

Advertisement

1. Tuberculosis

One-third of the 7.7 billion people on Earth carry the tuberculosis (TB) bacterium. Coughing, speaking, or singing spreads this communicable disease through the air to others. The bacteria that causes TB attacks the lungs, but may also affect the spine, kidneys, and brain. There are two types of TB, and not everyone who is infected becomes sick or passes the disease on to someone else. Latent TB infections cause no symptoms and are not infectious. The only way to detect this version is a tuberculin skin test. TB disease may appear soon after the infection, or it may linger until the immune system becomes too weak to fight it off.

 

normaals / Getty Images

Advertisement

More on Facty Health

Disclaimer

This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.