Because there is a population that has not been vaccinated against it. It is a viral disease, spread person to person. Vaccination prevents transmission of the disease.
A bacteriologist.
catches one of these diseases, the disease may be milder.
I DONT NKOW
A person can become immune by being vaccinatedwhich helps the body to develop long-term immunity against a disease.
vaccination is a process which implies immunity to a person against the disease causing organism so that a person can able to fight against that organism now it helps in eradication of many dreadfull disease like polio and smallpox etc, so it is definitely hellpfull to mankind
When a disease can be moved from person it can be known as an Infectious disease, a Transmittable disease, or a communicable disease.
Lyme disease vaccine has not been produces since 2003, but once a person is infected with a particular strain of the disease, they can develop an immunity that can last up to nine years.
An infectious disease.
The act or practice of inoculating someone with a vaccine as a protection against disease is called a vaccination. This is used to build immunity to specific diseases that could be detrimental to society and to the person who is not vaccinated.
A communicable disease is one that one person can catch from another person. The flu is one such disease. A noncommunicable disease is one that one person can not catch from another. Cancer is one such disease.
The disease which is spread from person to person is called infectious disease. For example flu is a viral disease through which the other person is infected from the patient