In a family of 5 people, 4 are vaccinated against mumps. An outbreak occurs in the area, explain why the unvaccinated person is less likely to contract the disease?

Unvaccinated person has naturally immune , cannot catched by this disease.

Explanation:

The white blood cells can recognise that these are not human protein . The invading or foreign protein is called an antigen . Antigen in the blood

starts the white cells making defence chemicals called antibodies. Some antibodies break up the antigens . This stops the antigen entering the body cells & makes it easier for the Phagocytes

to egulfs and digest antigens/pathogens & also

Lymphocytes produce antibodies to destroy pathogens.

Some bacteria produce toxins inside the body ,

Our white blood cells can also make antitoxins to

destroy the poison .

Antibodies and antitoxins help prevent microbes damaging the body . The help us fight off the.disease , giving us IMMUNITY to the disease.

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.