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Why are we not able to prevent the future pandemic of certain infectious diseases?
It is individuals' responsibility to prevent the spread of vaccine preventable diseases. Vaccines are definitely useful to prevent many viral diseases such as polio and smallpox to the maximum extent
The change in viral genome by mutations and an individual's as well as parent's immune resistant status can also determine the spread of vaccine preventable diseases.
And infection also travels in a prodromal state, and the full blown state of a viral and bacterial infection passing from one country to another that is not using vaccine for prevention of these infections is a big problem nowadays.
And also the appearance of older infections with newer mutations of viral and bacterial infections are also the cause of epidemics in recent years.
These are the some of the reasons for not preventing the future pandemic of certain viral and bacterial infections.