Unit 3A reading explorer 4

happening or existing in all parts of a country

• contaminate

• nutritional

• nationwide

• notion

necessary because it is an essential part of something or very important

• integral

• optimistic

• vulnerable

• praise

hopeful about the future or the success of something

• diligent

• vulnerable

• flock

• optimistic

extremely poisonous, spreading quickly

• virulent

• infected

• vulnerable

• compulsory

to make something dirty or harmful

• immune system

• digestion

• contaminate

• outbreak

necessary because someone in authority says you must

• compelling

• pioneer

• Competitors

• compulsory

a group of birds or sheep

• flock

• virulent

• solely

• feasible

hard-working in a careful and thorough way

• implicate

• diligent

• confine

• malnourished

A sudden rise in the incidence of a disease

• foodborne

• sanitary

• contaminate

• outbreak

to link; to group together

• associate

• eliminate

• compelling

• nationwide