hypervirulent

adjective

hy·​per·​vir·​u·​lent ˌhī-pər-ˈvir-ə-lənt 

-ˈvir-yə-

variants or hyper-virulent

: extremely or unusually virulent

hypervirulent strains of the bacteria

hypervirulence

ˌhī-pər-ˈvir-ə-lən(t)s 

-ˈvir-yə-

noun

or hyper-virulence

hypervirulence of novel clostridial strains

Word History

First Known Use

1926, in the meaning defined above