World War II US Army poster warning of venereal disease Testing may be for a single<unk> , or consist of a number of tests for a range of<unk> s, including tests for syphilis, trichomonas, gonorrhea, chlamydia, herpes, hepatitis, and HIV. No procedure tests for all<unk> s agents.<unk>  tests may be used for a number of reasons: * as a diagnostic test to determine the cause of symptoms or illness * as a screening test to detect asymptomatic or presymptomatic<unk> s * as a check that prospective sexual partners are free of disease before they engage in sex without safer sex precautions (for example, when starting a long term mutually monogamous sexual relationship, in fluid bonding, or for procreation). * as a check prior to or during pregnancy, to prevent harm to the baby * as a check after birth, to check that the baby has not caught an<unk>  from the mother * to prevent the use of infected donated blood or organs * as part of the process of contact tracing from a known infected individual * as part of mass epidemiological surveillance Early identification and treatment results in less chance to spread disease, and for some conditions may improve the outcomes of treatment. There is often a window period after initial<unk>  during which an<unk>  test will be negative. During this period, the<unk>  may be transmissible. The duration of this period varies depending on the<unk>  and the test. Diagnosis may also be delayed by reluctance of the infected person to seek a medical professional. One report indicated that people turn to the Internet rather than to a medical professional for information on<unk> s to a higher degree than for other sexual problems. Classification A poster from the Office for Emergency Management, Office of War Information, 1941–1945 Until the 1990s,<unk> s were commonly known as venereal diseases, an antiquated euphemism derived from the Latin £, being the adjectival form of Venus, the Roman goddess of love. However in the post-classical education era the euphemistic effect was entirely lost, and the common abbreviation "VD" held only negative connotations. Other former euphemisms for<unk> s include "blood diseases" and "social diseases". The present euphemism is in the use of the initials "STI" rather than in the words they represent. The World Health Organization (WHO) has recommended the more inclusive term<unk>  since 1999. Public health officials originally introduced the term<unk> , which clinicians are increasingly using alongside the term<unk>  transmitted disease in order to distinguish it from the former.
Sexually transmitted infection
Interstitial cystitis
Vertically transmitted infection
Neurodegenerative disease
Blood-borne disease
Environmental disease
Secondary trauma
Psychogenic disease