While treating an infectious disease, following three limitations are normally confronted:
(i) Once a person suffers from a disease, his body functions are impaired and may never recover completely.
(ii) As treatment takes time, the patient is confined to bed for some time.
(iii)
The infected person serves as a potential source of spread of this
infectious disease to other persons in the community. Keeping in view
these limitations, prevention of diseases is considered far better than
their cure. Preventing measures are precautionary steps taken to check
the transmission of infectious diseases.