(of a parasite or disease) spread into an organism or bodily part
Invade
medicines that fight bacterial infections in people and animals
Antibiotics
is a complex network of cells and proteins that defends the body against infection
immune system
the smallest structural and functional unit of an organism
cell
is an infectious agent of small size and simple composition that can multiply only in living cells of animals, plants, or bacteria
virus
give medical care or attention to; try to heal or cure
treat
treatment to produce immunity against a disease
Vaccination
keep safe from harm or injury
protect
break down (food) into substances that can be absorbed and used by the body
digest
the invasion and growth of germs in the body
infection
are microscopic organisms not visible with the naked eye
bacteria