疫病【えきびょう】
epidemic, plague, pestilence
免疫【めんえき】
immunity, immunization, immunisation, being hardened (to), being unaffected (by), being accustomed (to)
検疫【けんえき】
quarantine, medical inspection
防疫【ぼうえき】
communicable disease control (e.g. by quarantine, disinfection, etc.), prevention of epidemics
検疫所【けんえきじょ】
quarantine station