However, CRP increases in non-infectious inflammation, such as allergic disease, and it rises significantly in the active stage, so it lacks specificity.4 Serum procalcitonin (PCT), as a new indicator of systemic bacterial infection, shows high sensitivity and specificity compared with other traditional clinical inflammation indexes.5 This study aims to explore the clinical significance of dynamic monitoring of PCT levels on the judgment of infection and prognosis of patients with acute stroke. Here, CRP is linked to bacterial infectious disease.