The Lawrence Livermore Microbial Detection Array is a microarray capable of identifying 6,000 viruses and 15,000 bacteria as well as fungi and protozoa. Small probes on a glass slide detect specific sequences of DNA or RNA. When DNA or RNA is extracted from a sample to be identified, it is applied to the LLMDA. Any probe that positively identifies the sequence of the DNA or RNA will fluoresce, thus identifying the virus, bacteria, fungi, or protozoa.