( ( The vaccine ) ( ( is ( ( administered ( by injection ) ) ( into ( ( the arm ) ( on ( a ( monthly basis ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN vaccine)) (VP (VBZ is) (VP (VBN administered) (PP (IN by) (NP (NN injection))) (PP (IN into) (NP (NP (DT the) (NN arm)) (PP (IN on) (NP (DT a) (JJ monthly) (NN basis))))))) (. .)))
The vaccine is administered by injection into the arm on a monthly basis.
(ROOT (S (NP (NNP Vaccine)) (VP (VBZ is) (NP (NP (DT a) (JJ preventative) (NN measure)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (ADVP (RB often)) (VP (VBN delivered) (PP (IN by) (NP (NN injection))) (PP (IN into) (NP (DT the) (NN arm))))))))) (. .)))