(S (S (BASENP (NNS Vaccinations)) (VP (MD will) (VP (VB be) (VP (VP (VP (VBN repeated) (PP (IN on) (BASENP (NN 26) (NNP March)))) (PP (IN in) (BASENP (DT the) (NN six) (JJ key) (NNS countries)))) (CONJP (COMMA ,) (CC and)) (VP (ADVP (RB again) (PP (IN on) (BASENP (NN 24) (NNP April)))) (PP (IN for) (NP (BASENP (QP (DT all) (NN 19)) (NNS countries)) (VP (VBN involved))))))))) (PERIOD .))