Emerging Infectious Diseases
[Volume 5 No.6 / November - December 1999]
   Dispatches

   Toxic Shock Syndrome in the United States: Surveillance
   Update, 197919961

   Rana A. Hajjeh,* Arthur Reingold, Alexis Weil,*
   Kathleen Shutt,* Anne Schuchat,* and Bradley A.
   Perkins*

   *Centers for Disease Control and Prevention, Atlanta,
   Georgia, USA; and School of Public Health, University
   of California, Berkeley, California, USA

    Menstrual toxic shock syndrome (TSS)
    emerged as a public health threat to women
    of reproductive age in 197980. We reviewed
    surveillance data for the period 1979 to
    1996, when 5,296 cases were reported, and
    discuss changes in the epidemiologic
    features of TSS.

   Toxic shock syndrome (TSS) emerged as a result of
   changes in industry and personal behavior but responded
   to rapid public health action, including active
   surveillance (1). This illness received national
   attention in 1980 when unexplained febrile illness
   associated with shock, multiorgan dysfunction, and high
   death rates was reported in healthy young women from
   several states (2,3). This clinical syndrome had been
   described sporadically since the 1920s (4). The
   dramatic increase in the number of cases in 1979-80
   spurred epidemiologic, clinical, and laboratory studies
   that resulted in better understanding of the
   association between high-absorbency tampons and TSS
   (5). These studies led to recommendations that
   substantially decreased the risk for TSS (6,7).

   TSS became a nationally notifiable disease in 1980 (8).
   After the initial epidemic, the number of reported
   cases decreased significantly. In 1986, active
   surveillance was conducted in many areas in the United
   States (total population 34 million) to confirm that
   trend (9). The cumulative incidence (0.5 per 100,000
   population) confirmed the substantial decrease in the
   incidence of menstrual TSS observed in the passive
   surveillance system. Incidence rates decreased from 6
   to 12 per 100,000 among women 12 to 49 years of age
   (10,11) in 1980 to 1 per 100,000 among women 15 to 44
   years of age in 1986. These data also demonstrated that
   passive surveillance accurately described the
   demographic characteristics and case-fatality ratio of
   TSS cases (12,13).

   Ongoing surveillance in the United States allows us to
   estimate the current incidence of TSS and monitor
   whether new menstrual or vaginal products affect the
   risk for disease. Other products, including
   high-absorbency disposable diapers, have raised similar
   questions regarding TSS in children. To address these
   questions and describe the current epidemiologic
   characteristics and recent temporal trends of the
   syndrome, we reviewed data from the ongoing national
   surveillance for TSS from 1979 through 1996, focusing
   on three periods: 1979 to 1980 (the epidemic years),
   1981 to 1986 (a period of increased TSS awareness,
   culminating in active surveillance in 1986), and 1987
   to 1996.

   The Study

   The national TSS surveillance system has been described
   (8). Cases of TSS are reported to the Centers for
   Disease Control and Prevention (CDC) by state health
   departments in standardized case reports that include
   information on demographic and clinical
   characteristics, hospitalization status, outcome,
   laboratory data, products used during menses, and
   recurrence of menstruation-associated cases.

   We used the surveillance case definition for TSS
   revised in 1981, which requires five clinical criteria:
   fever, hypotension, rash, desquamation, and
   abnormalities in three or more organ systems (8). A
   definite case fulfilled all five criteria (unless the
   patient died before desquamation), and a probable case
   fulfilled four of the five criteria. For the purposes
   of this analysis and because information on
   desquamation was often unavailable because of death or
   early discharge, we included all TSS reports meeting
   either definition. A similar change regarding exclusion
   of desquamation was adopted in a retrospective study
   (14).

A TSS case was considered menstrual if onset of symptoms
occurred within 3 days of the beginning or end of menses;    all other cases were considered nonmenstrual and were classified into three categories: surgical
wounds, postpartum or postabortion, and other.
Information on recurrent episodes of TSS was collected only from women with menstrual TSS, by asking them about a similar previous illness during menstruation. Data were analyzed by using SAS 6.1 (SAS, Cary, NC). The chi-square test was used to test for statistical significance.

   From 1979 to 1996, 5,296 TSS cases were reported; 1,035
   of these were reported from 1987 to 1996 (Figure).
   Overall, 93% of all TSS cases reported from 1979 to
   1996 were among women. Although the proportion of
   menstrual cases decreased (Table), TSS affected mostly
   women. The median age was 22 years (3 days to 87
   years); 91% were white. No significant seasonal
   variation was noted. For cases in which the source of
   the report was known (n = 2,118), 64% were reported by
   infection control practitioners and 28% by physicians.

Figure. Toxic shock syndrome cases,* menstrual vs. nonmenstrual, United States, 19791996.

Table. Demographic characteristics, outcome, and proportion of menstrual cases of toxic shock syndrome, United States,
19791996

Menstrual TSS accounted for 74% of TSS cases during 1979 to 1996 (n = 5,296); this proportion, however, declined from 91% during 1979 and 1980 to 71% during 1981 to 1986 and 59% during 1987 to 1996. The median age of patients with menstrual TSS was 21 years, but 41% (n = 1,591) of menstrual TSS cases occurred in female patients 13 to 19 years of age. No significant change in the age distribution of menstrual cases was noted between the three periods (median age: 21
years, 1979 to 1980; 20 years, 1981 to 1986; 25 years, 1987 to 1996). Most (98%) patients with menstrual TSS cases for which the menstrual product was known (n = 3,457) reported tampon use, a proportion that did not change; 89% used tampons only, while 5.0% used both tampons and pads and 3% used tampons and minipads. The level of tampon absorbency was reported in only 41% (n = 1,385) of cases: 28% of patients used regular tampons, while 71% used super-absorbency tampons. Staphylococcus aureus was isolated from
90% of women with menstrual TSS who had vaginal cultures performed (n = 2,536). Of all the women with menstrual TSS, 1,606 (30%) responded to the question regarding recurrent disease, and 10% reported a previous illness similar to their TSS episode.

Nonmenstrual cases also occurred mostly in women (73%) and whites (87%). During 1987 to 1996, the proportion of all TSS cases that were nonmenstrual averaged 41% (30% to 55%). Of nonmenstrual cases, 18.3% were reported after surgical procedures, 11.5% were postpartum or postabortion, and 23.1% had nonsurgical cutaneous lesions. The proportion of all nonmenstrual cases reported after surgical procedures increased from 14% during 1979 to 1986 to 27% during 1987
to 1996 (p <0.05). Among female nonmenstrual case-patients, 12% reported using barrier contraceptives (sponges and diaphragms); this proportion was, however, significantly less (p <0.05) in 1987 to 1996 (6%) than in 1979 to 1986 (14%). Fifty cases of TSS in children < 5 years of age were reported during the 17-year period; more than half of these occurred in children < 2 years of age, and most (61.7%) were associated with nonsurgical cutaneous lesions. The percentage of TSS associated with nonsurgical cutaneous lesions (23.1%) was higher among younger patients (overall case-fatality ratio 4% [n = 2 deaths]) than among patients with other nonmenstrual cases.

Hospitalization status was known for 2,930 patients; 98% were hospitalized. The overall TSS case-fatality ratio was 4.1% (3% for menstrual cases, 5% for nonmenstrual cases) and was significantly higher among nonmenstrual cases (p <0.005). Among menstrual cases, the case-fatality ratio decreased significantly with time (from 5.5% in 1979 and 1980, to 2.8% in 1981 to 1986, to 1.8% in 1987 to 1996,
chi-square for linear trend [p = 0.0001]). This trend was not observed among nonmenstrual cases (for the three time periods: 8.5%, 5.3%, and 6%, respectively).

Conclusions

Our review of recent passive surveillance data confirms the
declining trend previously noted by active surveillance in 1986. Changes observed in the epidemiologic characteristics of TSS include an increase in the proportion of nonmenstrual cases and the difference in the risk for death between menstrual and nonmenstrual cases.

A number of factors could account for the observed decline,
including the decrease in tampon absorbency, the standardized labeling required by the U.S. Food and Drug Administration; greater awareness of TSS among women; and the proliferation of educational materials for women, including tampon package inserts (12). However,
at least 40% of menstrual TSS cases continue to affect women 13 to 19 years old, an age group not as likely to be aware of the risk for TSS and for whom further education may be needed.

Over the last few years, two changes have occurred in tampon use and composition: 1) All-cotton tampons have been introduced and marketed as an alternative product; in vitro studies have not, however, found any differences in the effects of these new tampons on the production of toxic shock syndrome toxin-1 (TSST-1) or its adsorption (15). 2) Tampons marketed specifically for overnight use have also been introduced. TSST-1 toxin production is not the only
indicator of the potential risk for TSS. Previous case-control studies found that exclusive use of tampons was associated with a higher risk for TSS than use in conjunction with pads (13). Continued surveillance will monitor the effect of these changes on TSS occurrence. However, because the syndrome is rare, only large
changes in the use of higher absorbency products would be likely to come to public health attention.

One of the important changes in the epidemiology of TSS is the increasing proportion of nonmenstrual cases, in particular, cases reported after surgical procedures. The factors contributing to this increase may include changes in delivery of surgical health-care services, with an increase in both outpatient procedures and the use of prosthetic devices. Hospitalizations caused by infections from
prosthetic devices and postoperative infections increased
significantly from 1980 to 1994 in the United States (16). In addition, the case-fatality ratio of nonmenstrual TSS cases did not decline, although the case-fatality ratio of menstrual TSS did. This difference in death rates could be due to several factors: nonmenstrual TSS may occur in less healthy (e.g., older) persons; diagnostic and reporting biases may result in more sensitive detection of severe cases of nonmenstrual TSS; decreased awareness
of nonmenstrual TSS among health-care professionals may lead to increased deaths because of late treatment; and the nonspecific signs and symptoms of postoperative TSS may delay diagnosis (17). Further studies are needed to validate the difference in deaths between the two types of TSS and to clarify the risk factors for nonmenstrual TSS. Recent molecular studies of the gene that carries toxic shock toxin (18) may contribute to a better understanding of the emergence of TSS and transmission of toxin-producing strains of S. aureus and could improve prevention. Physicians, in particular surgeons, and other health-care professionals may need further education about the risks for nonmenstrual TSS.

Dr. Hajjeh is a medical epidemiologist in the Division of Bacterial and Mycotic Diseases Branch, CDC. Her areas of expertise and research interests include epidemiology of mycotic diseases, bacterial meningitis, and unexplained critical illnesses of possible infectious etiology.

Address for correspondence: Rana A. Hajjeh, Centers for Disease Control and Prevention, Division of Bacterial and Mycotic Diseases, 1600 Clifton Road, Mail Stop C09, Atlanta, GA 30333, USA; fax: 404-639-0817; e-mail: rfh5@cdc.gov.

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1Presented in part at the European Conference on Toxic Shock
Syndrome, Royal Society of Medicine, London, September 1997, and at the International Conference on Emerging Infectious Diseases, Atlanta, March 1998. (Arbuthnott J, Furman B, editors. European conference on toxic shock syndrome, 1997. London [UK]: The Royal Society of Medicine Press Limited; 1998.)

Emerging Infectious Diseases
National Center for Infectious Diseases
Centers for Disease Control and Prevention
Atlanta, GA

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