CdTe QDs cytotoxicity have been studied in mammals and microorganisms such as bacteria, protozoa, fungi and viruses [10,13,50,59,70].5.???QDs Toxicity for BacteriaWang and co-workers evaluated the toxicity of a series of QDs compositions, namely CdSe, CdTe and ZnS-AgInS2 (ZAIS), against luminous bacteria (Photobacterium phosphoreum) as a microbial sensing element [71].