Microbiology deals with the diagnosis and treatment of infectious diseases caused by bacteria, fungi, viruses and parasites. Depending on the symptoms and suspected diagnosis, a variety of samples may be used for microbiological examination, including blood cultures, urine, stool, cerebrospinal fluid, skin scraping, hair, throat swab, wound swab or sputum. The methods range from nucleic acid amplification tests, ELISAs and rapid tests to indirect and direct immunofluorescence.