(S (S (BASENP (DT The) (NN agency)) (VP (VP (VBD increased) (BASENP (PRPD its) (NN pandemic) (NN alert) (NN level))) (PP (TO to) (NP (BASENP (DT the) (JJ sixth) (NN level)) (COMMA ,) (BASENP (PRPD its) (JJS highest)))))) (PERIOD .))