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Study Finds Prevalence Of Immunosuppression Among Adults In US

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Study Finds Prevalence Of Immunosuppression Among Adults In US

Highlights

  • High prevalence of immunosuppression has been found among adults in US.
  • Immunosuppression increases the risks and severity of primary or reactivation infections.
  • The findings are important as it will help to assess immunosuppressive treatments for prevention or mitigation of common chronic diseases in highly prevalent risk groups.
  • The number of immunosuppressed adults in the United States is thought to be increasing because of both greater life expectancy among immunosuppressed adults due to improvements in medical management, as well as new indications for immunosuppressive treatments.

    Immunosuppression increases the risks and severity of primary or reactivation infections.

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In a study published online by JAMA, Rafael Harpaz, M.D., M.P.H., of the U.S. Centers for Disease Control and Prevention, Atlanta, and colleagues analyzed data from the 2013 National Health Interview Survey (NHIS; an annual health survey conducted via household interviews).

The researchers estimated the prevalence of self-reported immunosuppressed adults in the United States.

The prevalence of immunosuppression has implications for food and water safety, tuberculosis control, vaccine programs, infection control strategies, outbreak preparedness, travel medicine, and other facets of public health.
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In 2013, NHIS respondents were asked whether they had ever been told by a "doctor or other health professional" that their immune system was weakened.

If the respondents said "yes", they were asked follow-up questions to assess whether that status was current (i.e., at time of response) and to report additional evidence of immunosuppression.

Those reporting the use of immunosuppressive medications or treatments or occurrence of immunosuppressive medical conditions (i.e., hematopoietic cancers or human immunodeficiency virus [HIV] infection) were considered immunosuppressed in this analysis.

On the other hand those reporting only frequent colds or infections or attributing immunosuppression solely to chronic diseases or to solid cancers (i.e., in absence of immunosuppressive treatments) were not considered immunosuppressed.

The total 2013 NHIS household response rate was 76%, consisting of 41,355 eligible households.

Of 34,426 eligible adult respondents within these households, 4.2% (n = 1,442) had been told at some time by a health professional that their immune system was weakened.

Of these, 2.8% (n = 951) reported current immunosuppression and additional evidence of immunosuppression.

The prevalence of immunosuppression in US adults was estimated to be at 2.7%.

Prevalence was highest among women, whites, and persons age 50 to 59 years.

"This study was not designed to explore the attributable causes of immunosuppression, although prevalence is likely driven by frequency and chronicity (e.g., life-long immunosuppression due to HIV infection, treatment for autoimmune conditions, or solid organ transplantation vs short-term cancer chemotherapy). The higher prevalence of immunosuppression among women may reflect their higher risk for autoimmune conditions. Age-specific immunosuppression increased with age, in parallel with the epidemiology of prevalent conditions that require immunosuppressive treatments, but it is unclear why it peaked at ages 50 to 59 years," the authors write.

This study addresses an underappreciated phenomenon and serves as a call for additional data from other sources to complement and fill the gaps in the study.

Tracking immunosuppression over time is particularly important given the hundreds of clinical trials now under way to assess the use of immunosuppressive treatments for prevention or mitigation of common chronic diseases in highly prevalent risk groups.



Source: Medindia

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