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Home > Perverse effects of vaccination

If a vaccination programme does not attain q_c, its effect is not to prevent the spread of the disease, but only to increase the average age at which individuals are infected. In diseases that have an increased severity or risk of complications with increased age, therefore, such a vaccination programme may actually increase the number of deaths from and problems relating to the disease. These are the perverse effects.

Some infectious diseases that increase in severity with age:

• Orchitis is a complication of mumps more common in post-pubescent males
• Polio is more likely to be paralytic in older people
• Rubella can cause complications in pregnancy
• Chickenpox has a number of complications in older patients, including pneumonia

See also

• Mathematical modelling in epidemiology for the mathematics of perverse effects
• Unintended consequences

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Topics: Perverse Effects Of Vaccination Complications Increase Disease...

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Perverse incentiveA perverse incentive is a term for an incentive that has the opposite effect to that intended. Perverse incentives are one of the most common forms of unintended consequences. For example: Paying the executives of corporations proportionately to the size Perverse effects of vaccinationPerverse effects of vaccination programmes manifest themselves when insufficient numbers of susceptibles are vaccinated to reach the critical threshold value (denoted q at which enough people are immune to the disease that its spread through the populatio