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Tetanus and Diphtheria Immune Status of Patients in a Family Practice

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Tetanus and Diphtheria Immune Status of Patients in a Family Practice Tetanus and Diphtheria Immune Status of Patients in a Family Practice Robert E. Pieroni, MD, Terry W. Coplin, MT (ASCP), and James D. Leeper, PhD University, Alabama Sera obtained randomly from 37 patients seen at a family prac­ tice center were evaluated for protective antibodies against tetanus and diphtheria using in vivo toxin neutralization methods. The patients’ ages ranged from 1 to 99 years. Seventy-four percent and 83 percent of patients were found to have protective antitoxin titers against tetanus and diphtheria, respectively. No significant differences in immune status were detected among different sexes or races. Whereas the mean age of subjects susceptible to tetanus was significantly greater than for those with protective antibody levels, this was not the case with diphtheria. It is postulated that natural diphtheria infection may be responsible for the high degree of protection noted among older subjects surveyed. Practical as well as edu­ cational benefits that may be obtained from a study of this nature are discussed. Despite their relative infrequency in this coun­ with the consequences of contracting the actual try, tetanus and diphtheria are associated with diseases. considerable morbidity.1 It is regrettable that even Most studies of tetanus and diphtheria immunity though relatively safe and effective immunization have focused on the pediatric age group. Ferguson agents are available, there has been no substantial et al,4 using the chart review method, have de­ decrease in the case-fatality ratio of these disor­ scribed deficiencies in tetanus and diphtheria im­ ders during this century.2 munization patterns among young patients in a Edsall3 has aptly termed tetanus “ the inexcus­ family practice program. Additionally, several re­ able disease.” Diphtheria might be similarly con­ ports have emphasized that a substantial propor­ sidered in this light. It has been shown that tetanus tion of adults, especially the elderly population, is toxoid is nearly 100 percent and diphtheria toxoid at risk for these diseases.2,5'7 For example, over 90 percent effective in inducing antibody re­ Crossley et al,2 in a study of adults in urban Min­ sponse.1 Maintenance of defenses against tetanus nesota, recently reported that a majority ot and diptheria is relatively easy and safe compared middle-aged females and of older patients of both sexes was susceptible to tetanus and diphtheria be­ From the Departments of Family Medicine and Internal cause of inadequate serum antibody levels. Medicine, the Department of Clinical Pathology, and the The present study was undertaken to help de­ Department of Community Medicine, College of Commu­ nity Health Sciences, Capstone Medical Center, University termine the tetanus and diphtheria immune status of Alabama, University, Alabama. Requests for reprints in outpatients of widely varying ages in a family should be addressed to Dr. Robert E. Pieroni, Box 6291, University of Alabama, University, AL 35486. practice setting. 0094-3509/80/090403-04$01.00 © 1980 Appleton-Century-Crofts 403 THE JOURNAL OF FAMILY PRACTICE, VOL. 11, NO. 3: 403-406, 1980 TETANUS AND DIPHTHERIA IMMUNE ST A TUS Protected 9 9° * ? ^ 9 ? 9 9 ^ 9 Unprotected ? Cf $ 99 t cf I I I I I I I I------------1----------- [— 0 10 20 30 40 50 60 70 80 90 100 Age Figure 1. Tetanus immune status in 35 patients aged 1 to 99 years (mean age = 40 years). Opened areas on symbols for sex refer to white patients and closed areas to black patients. Protection defined as serum antitoxin titer ^0.01 AU/ml. Statistical analyses for sex, y2= 0.16, P = 0.69; for race, x2 = 0.006, P = 0.94; for age, t = 4.96 P < 0.0001 Methods antitoxin levels are less expensive and time con­ Aliquots of sera from patients undergoing rou­ suming, they are also less precise and less reliable tine laboratory testing at the Capstone Medical in estimating the immunity of specific persons Center (Tuscaloosa, Alabama), a training site for compared to the in vivo methods used in this family practice residents and medical students, study.7 Results are expressed in antitoxin units per were collected and forwarded to the Massachu­ milliliter of sera in comparison to the standard setts Department of Public Health Biologic Labo­ antitoxin provided by the Bureau of Biologies of ratories for determination of tetanus and diphthe­ the Food and Drug Administration. Patients with ria antitoxin levels. The study was conducted in a antitoxin levels less than 0.01 antitoxin units (AU) double-blind manner. On the day of the study, sera per ml serum were considered at risk for tetanus or were collected consecutively from patients having diphtheria as previously described.10,11 Family blood drawn for routine laboratory studies, and practice residents and attending physicians were portions of the sera were saved for antibody notified of the immune status of their patients at analyses. A total of 34 sera were tested for both completion of the study. Statistical analyses to de­ tetanus and diphtheria antibody titers. One addi­ termine possible influences of race and sex on im­ tional serum was tested for tetanus antibody only, mune status were performed using the chi-square and two sera were tested only for diphtheria test with Yates correction; Student’s t test was antibody levels. The mean age of subjects studied also employed to determine the influence of age on for both tetanus and diphtheria immunity was 40 immunity. years, with age ranges for both studies of from 1 to 99 years. As is representative of the patient popu­ lation of the medical center where the study was conducted, the majority of the subjects were female and about 60 percent were white. Demographic features of the population studied, including age, Results race, and sex, are shown in Figures 1 and 2. Tetanus antibody levels were determined by neutralization titrations in mice8 and diphtheria Tetanus Antibody antitoxin by neutralization titrations in the skin of Results of the tetanus antitoxin determinations rabbits.9 Although in vitro methods for titrating in 35 patients are shown in Figure 1. Nine patients 404 THE JOURNAL OF FAMILY PRACTICE, VOL. 11, NO. 3,1980 TETANUS AND DIPHTHERIA IMMUNE STATUS Protected ?99• ? ? f 9 ?9 ? ^ 9 • * 9 ? ¥ 9 Unprotected f “ i i i i "1----- i i i 10 20 30 40 50 60 70 80 90 100 Age Figure 2. Diphtheria immune status in 36 patients aged 1 to 99 years (mean age = 40 years). Opened areas on symbols for sex refer to white patients and closed areas to black patients. Protection defined as serum antitoxin titer >0.01 AU/ml. Statistical analyses for sex, x2= 0.14, P=0.71; for race, x2=0.02, P=0.89; for age, t=2.17, P=0.037 (25.7 percent) ranging in age from 22 to 99 years Discussion were found to be at risk for developing tetanus. Nearly 100 years ago, Louis Pasteur wrote, Twenty-six subjects (74.3 percent) ranging in age “ When meditating over a disease, I never think of from 1 to 73 years were found to be protected finding a remedy for it but, instead, a means of against tetanus as determined by antibody titers preventing it.” This century has witnessed notable equal to or greater than 0.01 AU/ml. In the rela­ advances in immunization practices. Indeed, suc­ tively small patient sample, no significant influ­ cessful immunization programs have contributed ence of race or sex on immune status was noted. to the increased longevity and the “graying of However, the mean age of subjects at risk of teta­ America.” The recent elimination of smallpox of­ nus (66 years) was significantly greater (t = 4.96, P fers a vivid documentation of the success that may < 0.0001) than those with protective antibody be achieved with effective vaccination programs. levels (mean age 31 years). Although safe and effective immunizing agents for tetanus and diphtheria have been available for Diphtheria A ntibody over 50 years, protection against these potentially Diphtheria antitoxin levels found in 36 sera are fatal diseases is unfortunately not universal. shown in Figure 2. Whereas six (16.6 percent) of Nearly 20 years ago, Levine and Wyman12 con­ the subjects had antibody levels below the ac­ ducted a nationwide survey to determine immu­ cepted protective level, the remaining 30 subjects nity to tetanus among military recruits. They had protective levels of diphtheria antibody. found that 35 percent of the subjects were unpro­ Again, no significant differences were noted be­ tected, with extremes of seven percent unpro­ tween sexes or races. Of interest is the finding tected subjects in the state of Washington to 65 that, in contrast to tetanus immunity, the mean age percent unprotected in Alabama. of subjects at risk of diphtheria (21 years) was A large proportion of tetanus cases are found younger (t = 2.17, P < .05) than those with pro­ among elderly persons,1 a population whose im­ tective antibody levels (mean age 44 years). This mune status has been shown to be inadequate in finding, however, is of borderline statistical signif­ several studies.2'5'7 The present study revealed icance and may well have been influenced by the that in a limited sample of outpatients with ages small number of subjects, especially in the very ranging from 1 to 99 years, 74 percent had protec­ young age groups, in which a higher degree of im­ tive levels of antibody against tetanus. This com­ munity might be expected. pares favorably with other surveys and suggests 405 THE JOURNAL OF FAMILY PRACTICE, VOL. 11, NO. 3, 1980 TETANUS AND DIPHTHERIA IMMUNE STA TUS considerable improvement in the immune status of the optimum time and place to acquire thi inhabitants of this area compared to Levine and tude is in medical school and postgraduate?11'' Wyman’s earlier survey.12 The latter study, of ing, when practice patterns are still format,? course, is not strictly comparable to the present The findings of this preliminary survey Wl? survey since the subjects, military recruits, were used by the authors to emphasize further to m mainly confined to one sex and age group.
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