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in·fec·tious

adj 1  :  capable of causing infection <a carrier remains without exhibiting signs of disease>  <viruses and other agents>   2  :  communicable by invasion of the body of a susceptible organism <all contagious diseases are also , but it does not follow that all diseases are contagious -W. A. Hagan>  - compare CONTAGIOUS1   in*fec*tious*ly adv in*fec*tious*ness n 
 
 

 
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