
Infective
Possible confusion
Don't mix up 'infective' with 'infected'; 'infective' describes something that can cause infection. 
Collocation examples
'Infective' often pairs with words like 'agent,' 'disease,' or 'stage' to describe infectious aspects. 
Negative connotation
'Infective' has a negative connotation since it's related to illnesses and their spread. 