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subsequent (adj.)
following
sufficient (adj.)
enough for a particular purpose
survey (n.)
an examination of opinions by asking people questions
threshold (n.)
the level or point at which sth starts to happen
vital (adj.)
necessary for the success; extremely important
undertake (v)
do or begin sth; make an attempt
vaccination (n.)
inoculation
vaccine (n.)
a substance for immunisation
vomit (v.)
throw up
vulnerable (to) (adj.)
able to be easily hurt, influenced or attacked
yield (v.)
to supply or produce sth positive such as a profit
ensure (v.)
make certain, to quarantee
efficacy(n.)
able to produce the intended result
eradicate (v.)
to destroy sth bad
extent (n.)
area or length; amount