Synonyms for Infective (same or very similar meaning)
WordNet sense 1 (caused by infection or capable of causing infection):
infectiousWordNet sense 2 (containing or resulting from disease-causing organisms):
infected, septicWordNet sense 3 (able to cause disease):
pathogenic, morbificWordNet sense 4 (detrimental to good health):
unhealthfulFrom the ODE community, based on WordNetadd/edit