Measles, Mumps, and Rubella Titers in Air Force Recruits: Below Herd Immunity Thresholds?

INTRODUCTION: Preventable diseases like measles and mumps are occurring with increasing frequency in the U.S. despite the availability of an effective vaccine. Given concern that an outbreak may occur among military recruits, we compared serologic evidence of immunity to measles, mumps, and rubella among military recruits with known herd immunity thresholds and determined whether the current Department of Defense policy of presuming mumps immunity based on measles and rubella titers is reliable. METHODS: Serum antibody levels for measles, mumps, and rubella were obtained from all new recruits upon arrival at Joint Base San Antonio-Lackland, Texas, from 25 April 2013 through 24 April 2014. Seroprevalence of each disease was assessed by age and sex, and concordance between mumps titers and measles and rubella titers was calculated. Data analysis was performed in 2014-2015. RESULTS: Among 32,502 recruits, seroprevalences for measles, mumps, and rubella antibodies were 81.6%, 80.3%, and 82.1%, respectively. Of the 22,878 recruits seropositive for both measles and rubella antibodies, 87.7% were also seropositive for mumps. CONCLUSIONS: Seroprevalences for measles, mumps, and rubella antibodies among a large cohort of recruits entering U.S. Air Force basic training were generally lower than levels required to maintain herd immunity. In order to reduce the incidence of mumps infections, the Department of Defense should consider obtaining antibody titers for measles, mumps, and rubella and vaccinating all individuals susceptible to one or more of the viruses.

Mental health diagnoses and attrition in Air Force recruits.

INTRODUCTION: Mental disorders effect military readiness. Evaluating the frequency and impact of mental health diagnoses (MHD) in recruits, the source of the military workforce, is key to identifying opportunities for screening and prevention. OBJECTIVES: This study assessed the relationship between MHD in the Air Force recruit population and time to discharge. METHODS: A recruit cohort at Lackland Air Force Base was followed through Basic Military Training, technical school, and 14 months of service using data from Trainee Health Online Reporting System. Incidence rate of MHD was calculated. A risk ratio and attributable fraction were calculated for attrition comparing recruits with MHD to recruits receiving other diagnoses (non-MHD). A survival analysis was performed on recruits with MHD compared to those with non-MHD. RESULTS: Incidence of MHD was 7.9%. A recruit with a MHD was 4.28 (95% CI = 4.04-4.54) times more likely to separate in the first 14 months of service as compared to a recruit with a non-MHD. CONCLUSIONS: Recruits with MHD were separated faster and more often when compared to non-MHD. This study increases visibility of mental health disorders in recruits as a step toward better identifying those at higher risk of attrition.

Deployment-related depression screening, 2001-2008: comparing clinical versus research surveys.

BACKGROUND: Potential adverse mental health effects of deployment, including depression, are an ongoing concern. Although a previous study assessed under-reporting of depression on post-deployment health assessments compared to anonymous surveys, those results were not examined at the individual level to identify demographic or military factors that may be associated with unwillingness to report depression symptoms. PURPOSE: To compare self-reported depression symptoms on post-deployment health assessments with responses to the same depression questions on a research survey. METHODS: This cross-sectional study analyzed depression screening responses from 2001 to 2008 from participants of the Millennium Cohort Study, a longitudinal military cohort study, who completed a post-deployment health assessment within 30 days of a research survey. Kappa statistics and percent positive and negative agreement were calculated. Demographic and military characteristics associated with discordant screening results were examined. Initial analyses were performed in 2011, with additional analyses in 2013. RESULTS: Moderate agreement (κ=0.464) was observed between paired survey responses. A higher proportion of active duty members, the unmarried, and new accessions into military service endorsed depression symptoms on the research survey but not the military-linked survey. In stratified analyses, agreement was higher in Reserve/National Guard members than active duty (κ=0.561 vs 0.409). New active duty accessions showed lower agreement (κ=0.388), as did unmarried active duty participants (κ=0.304). CONCLUSIONS: Deployment health surveys are important tools for identifying returning service members experiencing depression symptoms. However, these findings suggest that ongoing stigma and barriers to appropriate follow-up mental health care remain to be addressed in the military setting.

Adenovirus 36 antibodies associated with clinical diagnosis of overweight/obesity but not BMI gain: a military cohort study.

CONTEXT: Obesity is a public health priority, which also threatens national security. Adenovirus 36 (Adv36) increases adiposity in animals and Adv36 antibody status is associated with human obesity, but it is unknown whether infection predicts the development of human adiposity. OBJECTIVE: The objective of the study was to assess infection status and subsequent weight gain. DESIGN: The study had a retrospective cohort design. SETTING: The study was conducted at Air Force fitness testing and clinical encounters. PARTICIPANTS: PARTICIPANTS included Air Force male enlistees, aged 18-22 years, with a baseline body mass index (BMI) of 20-30 kg/m(2) followed up from enlistment (beginning in 1995) until 2012 or separation from the Air Force. EXPOSURE: EXPOSURE included Adv36 infection status at the time of entry. MAIN OUTCOME MEASURE: Follow-up BMI, the primary outcome, and diagnosis of overweight/obesity by the International Classification of Diseases, ninth revision V85.25+ and 278.0* series (secondary outcome) were recorded. RESULTS: The last recorded follow-up BMI was similar among infected and uninfected, 26.4 and 27.2 kg/m(2), respectively (P > .05). However, infected individuals had a higher hazard of a medical provider's diagnosis of overweight/obese over time (hazard ratio 1.8, 95% confidence interval 1.0-3.1, P = .04), adjusted for baseline BMI. Additionally, infected individuals who were lean at baseline (BMI of 22.5 kg/m(2)) had a 3.9 times greater hazard of developing an overweight/obese clinical diagnosis (95% confidence interval 1.5-9.7, P = .004) compared with uninfected lean individuals after adjusting for interaction (P = .03) between infection and baseline BMI. CONCLUSIONS: The presence of Adv36 antibodies was not associated with higher BMI at baseline or follow-up within this military population. However, being infected was associated with developing a clinical diagnosis of overweight/obesity, especially among those lean at baseline.

Prevalence of and risk factors for autopsy-determined atherosclerosis among US service members, 2001-2011.

CONTEXT: Autopsies of US service members killed in the Korean and Vietnam wars demonstrated that atherosclerotic changes in the coronary arteries can appear early in the second and third decades of life, long before ischemic heart disease becomes clinically apparent. OBJECTIVE: To estimate the current prevalence of coronary and aortic atherosclerosis in the US armed forces. DESIGN, SETTING, AND PARTICIPANTS: Cross-sectional study of all US service members who died of combat or unintentional injuries in support of Operations Enduring Freedom and Iraqi Freedom/New Dawn between October 2001 and August 2011 and whose cardiovascular autopsy reports were available at the time of data collection in January 2012. Prevalence of atherosclerosis was analyzed by various demographic characteristics and medical history. Classifications of coronary atherosclerosis severity were determined prior to data analysis and designed to provide consistency with previous military studies: minimal (fatty streaking only), moderate (10%-49% luminal narrowing of ≥1 vessel), and severe (≥50% narrowing of ≥1 vessel). MAIN OUTCOME MEASURES: Prevalence of coronary and aortic atherosclerosis in the US armed forces and by age, sex, self-reported race/ethnicity, education, occupation, service branch and component, military rank, body mass index at military entrance, and International Classification of Diseases, Ninth Revision, Clinical Modification, diagnoses of cardiovascular risk factors. RESULTS: Of the 3832 service members included in the analysis, the mean age was 25.9 years (range, 18-59 years) and 98.3% were male. The prevalence of any coronary atherosclerosis was 8.5% (95% CI, 7.6%-9.4%); severe coronary atherosclerosis was present in 2.3% (95% CI, 1.8%-2.7%), moderate in 4.7% (95% CI, 4.0%-5.3%), and minimal in 1.5% (95% CI, 1.1%-1.9%). Service members with atherosclerosis were significantly older (mean [SD] age, 30.5 [8.1] years) than those without (mean [SD] age, 25.3 [5.6] years; P < .001). Comparing atherosclerosis prevalence among with those with no cardiovascular risk factor diagnoses (11.1% [95% CI, 10.1%-12.1%]), there was a greater prevalence among those with a diagnosis of dyslipidemia (50.0% [95% CI, 30.3%-69.7%]; age-adjusted prevalence ratio [PR], 2.09 [95% CI, 1.43-3.06]), hypertension (43.6% [95% CI, 27.3%-59.9%]; age-adjusted PR, 1.88 [95% CI, 1.34-2.65]), or obesity (22.3% [95% CI, 15.9%-28.7%]; age-adjusted PR, 1.47 [95% CI, 1.10-1.96]), but smoking (14.1% [95% CI, 8.0%-20.2%]) was not significantly associated with a higher prevalence of atherosclerosis (age-adjusted PR, 1.12 [95% CI, 0.73-1.74]). CONCLUSION: Among deployed US service members who died of combat or unintentional injuries and received autopsies, the prevalence of atherosclerosis varied by age and cardiovascular risk factors.

The in-service examination score as a predictor of success on the American Board of Preventive Medicine certification examination.

BACKGROUND: To date, there has been no study correlating the American College of Preventive Medicine (ACPM) in-service exam (ISE) with the American Board of Preventive Medicine (ABPM) certification exam. PURPOSE: To validate the ACPM ISE as a predictor of success on the ABPM certification exam. METHODS: ISE and ABPM certification exam scores were standardized by year using z-scores. The correlation between practicum year ISE scores and certification exam scores for military preventive medicine residencies in the National Capital and Washington State areas (core component only) was analyzed. A multivariable linear regression model included adjustments for age, gender, Master of Public Health grade point average (GPA), prior specialty board certification, and board deferral ≥1 year after graduation. Data were collected in 2010 and analyzed in 2011. RESULTS: Performance on the ISE was correlated with performance on the ABPM certification core exam (r=0.61, p<0.001). Performance on the ISE was still significant after adjusting for relevant demographic and educational variables (p<0.001). Other significant covariates included GPA (p=0.001) and board deferral (p=0.04) in the linear regression model. CONCLUSIONS: Performance on the ISE is moderately correlated with performance on the board certification core exam, and this correlation remained significant after adjustment in the linear regression model. These results serve to validate the ISE as a means for program directors to identify residents at academic risk and as encouragement for residents to take the certification exam as soon as possible after graduation.