What are the six killer diseases?

The Six Killer Diseases: What You Need to Know

Throughout history, certain diseases have posed severe threats to global health—especially among children. Known as the "six killer diseases," they include Diphtheria, Measles, Rubella, Pertussis (whooping cough), Tuberculosis (TB), Tetanus, and Polio. Though they differ in how they spread and the symptoms they cause, they share one dangerous trait: they can be deadly, particularly without access to timely medical care or vaccination.

Diphtheria attacks the respiratory system, often leading to breathing difficulties and heart complications. Measles, highly contagious, can result in severe fever, blindness, or encephalitis. Rubella, while usually mild in adults, can cause devastating birth defects if contracted by pregnant women. Pertussis, known for its violent coughing fits, is especially dangerous for infants. Tuberculosis primarily affects the lungs and remains a leading cause of death in many low-income countries. Tetanus, caused by bacteria in wounds, leads to painful muscle stiffness and spasms. Polio, once widespread, can cause irreversible paralysis—though it’s now nearly eradicated thanks to vaccines.

The good news? Most of these diseases are preventable. Vaccines included in routine immunization programs—such as the MMR (Measles, Mumps, Rubella), DTaP (Diphtheria, Tetanus, Pertussis), and the BCG vaccine for TB—have dramatically reduced infection rates worldwide. Polio vaccination campaigns have brought the disease to the brink of global elimination.

Still, outbreaks still occur, often where vaccine coverage is low. If someone in your family ever had one of these illnesses, it's worth learning their story. These accounts can serve as powerful reminders of how far we’ve come—and how important it is to protect future generations through vaccination and awareness.