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Sexually
Transmitted Diseases > Surveillance & Statistics > 2006
Reports > 2006 National Report > Appendix
- Case Definitions
   STD Surveillance Case DefinitionsPART 1. CASE DEFINITIONS1 FOR NATIONALLY NOTIFIABLE INFECTIOUS DISEASESChancroid (Revised 9/96)Clinical description A sexually transmitted disease characterized by painful genital ulceration and inflammatory inguinal adenopathy. The disease is caused by infection with Haemophilus ducreyi. Laboratory criteria for diagnosis
Case classification Probable: a clinically compatible case with both a) no evidence of Treponema pallidum infection by darkfield microscopic examination of ulcer exudate or by a serologic test for syphilis performed 7 days after onset of ulcers and b) either a clinical presentation of the ulcer(s) not typical of disease caused by herpes simplex virus (HSV) or a culture negative for HSV. Confirmed: a clinically compatible case that is laboratory confirmed Chlamydia trachomatis, Genital Infections (Revised 9/96)Clinical description Infection with Chlamydia trachomatis may result in urethritis, epididymitis, cervicitis, acute salpingitis, or other syndromes when sexually transmitted; however, the infection is often asymptomatic in women. Perinatal infections may result in inclusion conjunctivitis and pneumonia in newborns. Other syndromes caused by C. trachomatis include lymphogranuloma venereum (see Lymphogranuloma Venereum) and trachoma. Laboratory criteria for diagnosis
Case classification Confirmed: a case that is laboratory confirmed Gonorrhea (Revised 9/96)Clinical description A sexually transmitted infection commonly manifested by urethritis, cervicitis, or salpingitis. Infection may be asymptomatic. Laboratory criteria for diagnosis
Case classification Probable: a) demonstration of gram-negative intracellular diplococci in an endocervical smear obtained from a female or b) a written morbidity report of gonorrhea submitted by a physician Confirmed: a case that is laboratory confirmed Syphilis (All Definitions Revised 9/96)Syphilis is a complex sexually transmitted disease that has a highly variable clinical course. Classification by a clinician with expertise in syphilis may take precedence over the following case definitions developed for surveillance purposes. Syphilis, primary Clinical description A stage of infection with Treponema pallidum characterized by one or more chancres (ulcers); chancres might differ considerably in clinical appearance. Laboratory criteria for diagnosis
Case classification
Probable: a clinically compatible case with one or more ulcers (chancres) consistent with primary syphilis and a reactive serologic test (nontreponemal: Venereal Disease Research Laboratory
[VDRL] or rapid plasma reagin [RPR]; treponemal: fluorescent treponemal antibody absorbed
[FTA-ABS] or microhemagglutination assay for antibody to T. pallidum [MHA-TP]) Confirmed: a clinically compatible case that is laboratory confirmed Syphilis, secondary Clinical description A stage of infection caused by T. pallidum and characterized by localized or diffuse mucocutaneous lesions, often with generalized lymphadenopathy. The primary chancre may still be present. Laboratory criteria for diagnosis
Case classification Probable: a clinically compatible case with a nontreponemal (VDRL or RPR) titer ≥4 Confirmed: a clinically compatible case that is laboratory confirmed Clinical description A stage of infection caused by T. pallidum in which organisms persist in the body of the infected person without causing symptoms or signs. Latent syphilis is subdivided into early, late, and unknown categories based on the duration of infection. Case classification Probable: no clinical signs or symptoms of syphilis and the presence of one of the following:
Clinical description A subcategory of latent syphilis. When initial infection has occurred within the previous 12 months, latent syphilis is classified as early latent. Case classification Probable: latent syphilis (see Syphilis, latent) in a person who has evidence of having acquired the infection within the previous 12 months based on one or more of the following criteria:
Syphilis, late latent Clinical description A subcategory of latent syphilis. When initial infection has occurred >1 year previously, latent syphilis is classified as late latent. Case classification Probable: latent syphilis (see Syphilis, latent) in a patient who has no evidence of having acquired the disease within the preceding 12 months (see Syphilis, early latent) and whose age and titer do not meet the criteria specified for latent syphilis of unknown duration. Syphilis, latent, of unknown duration Clinical description A subcategory of latent syphilis. When the date of initial infection cannot be established as having occurred within the previous year and the patient’s age and titer meet criteria described below, latent syphilis is classified as latent syphilis of unknown duration. Case classification Probable: latent syphilis (see Syphilis, latent) that does not meet the criteria for early latent syphilis, and the patient is aged 13–35 years and has a nontreponemal titer ≥ 32 Neurosyphilis Clinical description Evidence of central nervous system infection with T. pallidum Laboratory criteria for diagnosis
Case classification Probable: syphilis of any stage, a negative VDRL in CSF, and both the following:
Confirmed: syphilis of any stage that meets the laboratory criteria for neurosyphilis Syphilis, late, with clinical manifestations other than neurosyphilis (late benign syphilis and cardiovascular syphilis) Clinical description Clinical manifestations of late syphilis other than neurosyphilis may include inflammatory lesions of the cardiovascular system, skin, and bone. Rarely, other structures (e.g., the upper and lower respiratory tracts, mouth, eye, abdominal organs, reproductive organs, lymph nodes, and skeletal muscle) may be involved. Late syphilis usually becomes clinically manifest only after a period of 15–30 years of untreated infection. Laboratory criteria for diagnosis Demonstration of T. pallidum in late lesions by fluorescent antibody or special stains (although organisms are rarely visualized in late lesions) Case classification Probable: characteristic abnormalities or lesions of the cardiovascular system, skin, bone, or other structures with a reactive treponemal test, in the absence of other known causes of these abnormalities, and without CSF abnormalities and clinical symptoms or signs consistent with neurosyphilis Confirmed: a clinically compatible case that is laboratory confirmed Comment Analysis of CSF for evidence of neurosyphilis is necessary in the evaluation of late syphilis with clinical manifestations. Syphilitic Stillbirth Clinical description A fetal death that occurs after a 20-week gestation or in which the fetus weighs >500 g and the mother had untreated or inadequately treated* syphilis at delivery Comment For reporting purposes, syphilitic stillbirths should be reported as cases of congenital syphilis. Syphilis, Congenital (Revised 9/96)Clinical description A condition caused by infection in utero with Treponema pallidum. A wide spectrum of severity exists, and only severe cases are clinically apparent at birth. An infant or child (aged < 2 years) may have signs such as hepatosplenomegaly, rash, condyloma lata, snuffles, jaundice (nonviral hepatitis), pseudoparalysis, anemia, or edema (nephrotic syndrome and/or malnutrition). An older child may have stigmata (e.g., interstitial keratitis, nerve deafness, anterior bowing of shins, frontal bossing, mulberry molars, Hutchinson teeth, saddle nose, rhagades, or Clutton joints). Laboratory criteria for diagnosis Demonstration of T. pallidum by darkfield microscopy, fluorescent antibody, or other specific stains in specimens from lesions, placenta, umbilical cord, or autopsy material Case classification Probable: a condition affecting an infant whose mother had untreated or inadequately treated* syphilis at delivery, regardless of signs in the infant, or an infant or child who has a reactive treponemal test for syphilis and any one of the following:
Confirmed: a case that is laboratory confirmed Comment Congenital and acquired syphilis may be difficult to distinguish when a child is seropositive after infancy. Signs of congenital syphilis may not be obvious, and stigmata may not yet have developed. Abnormal values for CSF VDRL, cell count, and protein, as well as IgM antibodies, may be found in either congenital or acquired syphilis. Findings on radiographs of long bones may help because radiographic changes in the metaphysis and epiphysis are considered classic signs of congenitally acquired syphilis. The decision may ultimately be based on maternal history and clinical judgment. In a young child, the possibility of sexual abuse should be considered as a cause of acquired rather than congenital syphilis, depending on the clinical picture. For reporting purposes, congenital syphilis includes cases of congenitally acquired syphilis among infants and children as well as syphilitic stillbirths. *Inadequate treatment consists of any nonpenicillin therapy or penicillin administered < 30 days before delivery. PART 2. CASE DEFINITIONS1 FOR NON-NOTIFIABLE INFECTIOUS DISEASESGenital Herpes (Herpes Simplex Virus) (Revised 9/96)Clinical description A condition characterized by visible, painful genital or anal lesions Laboratory criteria for diagnosis
Case classification Probable: a clinically compatible case (in which primary and secondary syphilis have been excluded by appropriate serologic tests and darkfield microscopy, when available) with either a diagnosis of genital herpes based on clinical presentation (without laboratory confirmation) or a history of one or more previous episodes of similar genital lesions Confirmed: a clinically compatible case that is laboratory confirmed Comment Genital herpes should be reported only once per patient. The first diagnosis for a patient with no previous diagnosis should be reported. Genital Warts (Revised 9/96)Clinical description An infection characterized by the presence of visible, exophytic (raised) growths on the internal or external genitalia, perineum, or perianal region Laboratory criteria for diagnosis
Case classification Probable: a clinically compatible case without histopathologic diagnosis and without microscopic or serologic evidence that the growth is the result of secondary syphilis Confirmed: a clinically compatible case that is laboratory confirmed Comment Genital warts should be reported only once per patient. The first diagnosis for a patient with no previous diagnosis should be reported. Granuloma InguinaleClinical description A slowly progressive ulcerative disease of the skin and lymphatics of the genital and perianal area caused by infection with Calymmatobacterium granulomatis. A clinically compatible case would have one or more painless or minimally painful granulomatous lesions in the anogenital area. Laboratory criteria for diagnosis
Case classification Confirmed: a clinically compatible case that is laboratory confirmed Lymphogranuloma VenereumClinical description Infection with L1, L2, or, L3 serovars of Chlamydia trachomatis may result in a disease characterized by genital lesions, suppurative regional lymphadenopathy, or hemorrhagic proctitis. The infection is usually sexually transmitted. Laboratory criteria for diagnosis
Case classification Probable: a clinically compatible case with one or more tender fluctuant inguinal lymph nodes or characteristic proctogenital lesions with supportive laboratory findings of a single C. trachomatis complement fixation titer of > 64 Confirmed: a clinically compatible case that is laboratory confirmed Mucopurulent Cervicitis (Revised 9/96)Clinical description Cervical inflammation that is not the result of infection with Neisseria gonorrhoeae or Trichomonas vaginalis. Cervical inflammation is defined by the presence of one of the following criteria:
Laboratory criteria for diagnosis
Case classification Confirmed: a clinically compatible case in a female who does not have either gonorrhea or trichomoniasis Comment Mucopurulent cervicitis (MPC) is a clinical diagnosis of exclusion. The syndrome may result from infection with any of several agents (see Chlamydia trachomatis, Genital Infections). If gonorrhea, trichomoniasis, and chlamydia are excluded, a clinically compatible illness should be classified as MPC. An illness in a female that meets the case definition of MPC and C. trachomatis infection should be classified as chlamydia. Nongonococcal Urethritis (Revised 9/96)Clinical description Urethral inflammation that is not the result of infection with Neisseria gonorrhoeae. Urethral inflammation may be diagnosed by the presence of one of the following criteria:
Laboratory criteria for diagnosis
Case classification Confirmed: a clinically compatible case in a male in whom gonorrhea is not found, either by culture, Gram stain, or antigen or nucleic acid detection Comment Nongonococcal urethritis (NGU) is a clinical diagnosis of exclusion. The syndrome may result from infection with any of several agents (see Chlamydia trachomatis, Genital Infection). If gonorrhea and chlamydia are excluded, a clinically compatible illness should be classified as NGU. An illness in a male that meets the case definition of NGU and C. trachomatis infection should be classified as chlamydia. Pelvic Inflammatory Disease (Revised 9/96)Clinical case definition A clinical syndrome resulting from the ascending spread of microorganisms from the vagina and endocervix to the endometrium, fallopian tubes, and/or contiguous structures. In a female who has lower abdominal pain and who has not been diagnosed as having an established cause other than pelvic inflammatory disease (PID) (e.g., ectopic pregnancy, acute appendicitis, and functional pain), all the following clinical criteria must be present:
In addition to the preceding criteria, at least one of the following findings must also be present:
Case classification Confirmed: a case that meets the clinical case definition Comment For reporting purposes, a clinician’s report of PID should be counted as a case.
1 Centers for Disease Control and Prevention. Case definitions for infectious conditions under public health surveillance, 1997. MMWR 1997;46(No. RR-10;1).
Page last modified: November 13, 2007 Page last reviewed: November 13, 2007 Content Source: Division of STD Prevention, National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention |
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