infect(v) to cause(someone or something) to become sick or affected by disease;often used as (be) in fected (Example:He was infected by a coworker.Or:He was infected with AIDS)
infectious(adj) capable of causing infection:capable of being passed to someone else by germs that enter the body
infection(n) the act or process of infecting someon ro something;the state of being infected
effective(adj) producing a result that is wanted;having an intended effect
effectiveness(n) the degree to which something is successful in producing a desired result:success