infectious (adj.)

• catching
• communicable
• contagious
• deadly
• destructive
• endemic
• epidemic
• epiphytotic
• epizootic
• infective
• irresistible
• malign
• malignant
• mephitic
• miasmal
• miasmic
• noxious
• pandemic
• pestiferous
• pestilent
• pestilential
• poisonous
• sporadic
• sympathetic
• taking
• toxic
• toxicant
• transmissible
• venomous
• virulent
• zymotic