Flu Virus

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contagious = spread from one person or organism to another, typically by direct contact

inadvertently = accidentally

eradicate = to get rid of something completely or destroy something bad

uncanny = strange or mysterious

sequence = to determine the primary structure of an unbranched biopolymer

unleash = to free

elusive = difficult to find, catch, or achieve

swarm = a large or dense group

devastating consequences = results causing a lot of damage or destruction

recurring nightmare = an unpleasant situation that is repeated over and over again over a long period of time

cut loose = to begin to act without restraint

EFL subset that concentrates more on language in context than on grammar and language structures. It covers topics from accounting or computer science to tourism and business management. "Specific" means the studying through a field that is already known and relevant to a student.