Agent of disease
Being the carriers/vectors of disturbing , destroying or causative agents
vectors being
any other species which carry the disease with in themselves
insects
causative agents
non - cellular
life
Viral Infection , virology
cellular
life
Bacterial Infection , microbiology
Parasitic Infection , parasitology
Fungal Infection , mycology
Entry of either vectors or causative agents
Mode of transmission of either vectors or causative agents
water
borne disease
air
borne diseases
food
borne diseases
Minerals and nutrition
contact with other hosts
physical contact or sexual contact