"The decrease in the number of disease carriers is vital to the prevention of bacterial infections. Vaccines are never 100% effective. Some people are genetically unable to respond to the vaccine, some have immunodeficiencies that preclude receiving vaccines or developing a response to the vaccine, some haven’t gotten around to vaccination or are too young to receive a vaccine. If you vaccinate a large number of people, besides preventing disease in an individual, it helps protect the vulnerable in a population. Vaccines prevent disease propagation."
"The vaccine [for whooping cough] is good, but not perfect. Vaccine efficacy is 64% for cases defined by mild cough, 81% for paroxysmal cough, and 95% for severe clinical illness (11). Note the vaccine is good for attenuating the disease, not preventing it entirely."
"The decrease in the number of disease carriers is vital to the prevention of bacterial infections. Vaccines are never 100% effective. Some people are genetically unable to respond to the vaccine, some have immunodeficiencies that preclude receiving vaccines or developing a response to the vaccine, some haven’t gotten around to vaccination or are too young to receive a vaccine. If you vaccinate a large number of people, besides preventing disease in an individual, it helps protect the vulnerable in a population. Vaccines prevent disease propagation."
"The vaccine [for whooping cough] is good, but not perfect. Vaccine efficacy is 64% for cases defined by mild cough, 81% for paroxysmal cough, and 95% for severe clinical illness (11). Note the vaccine is good for attenuating the disease, not preventing it entirely."