Communicable diseases are transmitted from an infected person to a healthy person by microorganisms such as bacteria, viruses, fungi, and worms. These disease-causing microbes are known as pathogens or germs.

A process by which a person becomes protected against a disease through vaccination. This term is often used interchangeably with vaccination or inoculation.Vaccines stimulate the body's own immune system to protect the person from subsequent infection or disease.

Antibodies are proteins that protect you when an unwanted substance enters your body. When disease carrying microbes enter the body, the body produces certain substances to fight invaders, these are called antibodies.

Landfill is a large area used for waste disposal. It is a method of managing a large amount of biodegradable waste. Waste having both useful and non-useful components is collected in trucks and dumped in a landfill. The non-useful components are separated out. landfill is home to many disease-causing microorganisms and other harmful materials. Therefore, landfills should be away from residential areas.