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Despite the success of vaccines, only one of these diseases â smallpox â has been erased from the globe. Because of vaccines, 12 deadly diseases can be cured including the chicken pox, diphtheria, Invasive H. flu, Malaria, Pneumococcal disease, polio, tetanus, typhoid fever, Yellow fever and smallpox.
Human and animal diseases are often caused by viruses or bacteria. Over the past two hundred or so years, vaccines have eradicated some of these diseases. Others have returned to haunt humans with new and ever-mutating strains, or revived when vaccination programs were interrupted. Communicable diseases may spread in different ways: through blood, air, feces/urine, food, or water.