phlt 304 One Health & Epi Triad

pptx

One Health definition

health of ppl = closely connected to health of animals & shared env

One Health ex

vax animals for rabies → protects humans

soil quality → crop growth → human health

Epidemiologic Triad

host ←→ agent ←→ env

Epi Triad characteristics

susceptible host = person

agent that causes harm = infection/contaminant

env = brings host & agent tgt

env chemical contamination sources

natural

• volcanoes

• soil deposits

• natural seepage

• fires

anthropogenic (caused by humans)

• pollution

air chemical contaminations

• SO2

• volatile organic compounds (VOC)

• nitrogen oxides

• ozone (O3)

• CO

• Pb

water chemical contaminants

chemical

• inorg = As, Pb, Hg

• org = w/C

waterborne illness

• protozoan parasite (Cryptosporidium)

• Hepatitis A

• cholera

bioaccumulation

accumulation of toxic chemical in tissue of organism

biomagnification

bioacc in food chain

→ ↑ toxic chemical concentrations in animals going up food chain

ex: mercury

high Hg food

• king mackerel

• marlin

• orange roughly

• shark

• swordfish

• tilefish

• tuna, bigeye