Publications by authors named "Richard Niska"

Introduction: The COVID-19 pandemic affected the lives of military members and their families, with over 400,000 cases among U.S. military members since the start of the pandemic.

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Background And Objectives: Stay-at-home orders, social isolation recommendations, and fear of COVID-19 exposure have led to delays in children's preventive health services during the pandemic. Delays can lead to missed opportunities for early screening and detection of health problems, and increased risks for outbreaks of vaccine-preventable diseases. Understanding prevalence of and reasons for missed, delayed, or skipped preventive health services is important for developing strategies to achieve rapid catch-up of essential health services.

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Article Synopsis
  • - The OraQuick Advance Rapid HIV-1/2 Test detects HIV antibodies in blood and oral fluid, but its performance and false-negative results were analyzed in studies involving high-risk HIV-negative participants in Botswana and Thailand.
  • - In a review of 287 individuals who became HIV positive, there were 233 false-negative results, with the time it took for the test to show positive results (OFOQ conversion) ranging from about 15 to 550 days, with factors like clinical site and test operator being significant contributors to the delays.
  • - The study concluded that the frequent false-negative results from the OraQuick test are influenced by multiple factors, including preexposure prophylaxis, viral load, and the test kit's expiration
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Introduction: Accurate clinical laboratory reference values derived from a local or regional population base are required to correctly interpret laboratory results. In Botswana, most reference intervals used to date are not standardized across clinical laboratories and are based on values derived from populations in the United States or Western Europe.

Methods: We measured 14 hematologic and biochemical parameters of healthy young adults screened for participation in the Botswana HIV Pre-exposure Prophylaxis Study using tenofovir disoproxil fumarate and emtricitabine (TDF/FTC) (TDF2 Study).

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Background: Tenofovir-emtricitabine (TDF-FTC) pre-exposure prophylaxis (PrEP) has been found to be effective for prevention of HIV infection in several clinical trials. Two studies of TDF PrEP among men who have sex with men showed slight bone mineral density (BMD) loss. We investigated the effect of TDF and the interaction of TDF and hormonal contraception on BMD among HIV-uninfected African men and women.

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We examined CD4 cell count and plasma viral load patterns among Botswana TDF/FTC Oral HIV Prophylaxis Trial (TDF2 study) participants who seroconverted, comparing participants assigned to receive tenofovir/emtricitabine with participants assigned to receive placebo. We also evaluated for antiretroviral drug resistance among the breakthrough HIV infections. Among nine seroconverters assigned to tenofovir/emtricitabine and 24 to placebo, there were no significant differences in their CD4 cell count or viral load profiles over time.

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This brief shows that elevated BP readings are much more common at visits to the ED than at visits to outpatient primary care providers. Compared with the 27.0% prevalence found at visits to primary care providers, the combined visit prevalence of severely and moderately elevated BP in EDs is about 43.

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Objective: This report is a summary of hospital preparedness for responding to public health emergencies, including mass casualties and epidemics of naturally occurring diseases such as influenza.

Methods: Data are from an emergency response preparedness supplement to the 2008 National Hospital Ambulatory Medical Care Survey, which uses a national probability sample of nonfederal general and short-stay hospitals in the United States. Sample data were weighted to produce national estimates.

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Objective: This report presents data on U.S. emergency department (ED) visits in 2007, with statistics on hospital, patient, and visit characteristics.

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Ambulatory medical care in rural Haiti.

J Health Care Poor Underserved

February 2010

Introduction: In 2005, a team of U.S. physicians, nurse practitioners, nurses, pharmacists, emergency medical technicians and lay support personnel provided health services in an isolated town in rural Haiti.

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The 2009 Academic Emergency Medicine consensus conference focused on "Public Health in the ED: Surveillance, Screening and Intervention." One conference breakout session discussed the significant research value of health-related data sets. This article represents the proceedings from that session, primarily focusing on emergency department (ED)-related data sets and includes examples of the use of a data set based on ED visits for research purposes.

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Introduction: We examined stroke prevention with antiplatelet agents by U.S. nonfederal office physicians and hospital outpatient departments from 2005-2006.

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Objectives: To examine statin prescribing for secondary cardiovascular disease prevention at primary care visits by older patients in 2005-2006.

Design: The National Ambulatory Medical Care Survey and the National Hospital Ambulatory Medical Care Survey are cross-sectional, using a multistage random sample (112 primary sampling units, physicians and hospitals, patient visits). Characteristics from 4964 primary care visits were abstracted from medical records.

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Background: In the context of recently published guidelines, we studied anticoagulation for atrial fibrillation as part of stroke prevention.

Methods: The National Center for Health Statistics ambulatory care surveys use a multistage random sampling design consisting of 112 US geographic primary sampling units, nonfederal physician offices and hospital outpatient departments within those units, and patient visits to those offices and outpatient departments. Patient and visit characteristics were abstracted from 1771 medical records of patients with atrial fibrillation aged 20 years or older from 2001 to 2006, representing a national estimate of 6.

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Objective: This report presents the most current (2006) nationally representative data on visits to hospital emergency departments (ED) in the United States. Statistics are presented on selected hospital, patient, and visit characteristics.

Methods: Data are from the 2006 National Hospital Ambulatory Medical Care Survey (NHAMCS), the longest continuously running nationally representative survey of hospital ED utilization.

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Objective: To identify hospital characteristics that predict collaboration with public safety organizations on bioterrorism response plans and mass casualty drills.

Methods: The 2003 and 2004 Bioterrorism and Mass Casualty Supplements to the National Hospital Ambulatory Medical Care Survey examined collaboration with emergency medical services (EMS), hazardous materials teams (HAZMAT), fire departments, and law enforcement. The sample included 112 geographic primary sampling units and 1,110 hospitals.

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Objective: This study presents baseline data to determine which hospital characteristics are associated with preparedness for terrorism and natural disaster in the areas of emergency response planning and availability of equipment and specialized care units.

Methods: Information from the Bioterrorism and Mass Casualty Preparedness Supplements to the 2003 and 2004 National Hospital Ambulatory Medical Care Surveys was used to provide national estimates of variations in hospital emergency response plans and resources by residency and medical school affiliation, hospital size, ownership, metropolitan statistical area status, and Joint Commission accreditation. Of 874 sampled hospitals with emergency or outpatient departments, 739 responded for an 84.

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Objective: This report presents the most current (2005) nationally representative data on visits to hospital emergency departments (ED) in the United States. Statistics are presented on selected hospital, patient, and visit characteristics. Selected trends in ED utilization from 1995 through 2005 are also presented.

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Objectives: This investigation describes terrorism preparedness among U.S. office-based physicians and their staffs in identification and diagnosis of terrorism-related conditions, training methods and sources, and assistance with diagnosis and reporting.

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Background And Objectives: Terrorism may have a severe impact on physicians' practices. We examined terrorism preparedness training of office-based physicians.

Methods: The National Ambulatory Medical Care Survey uses a nationally representative multi-stage sampling design.

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Objective: This study estimates baseline data to determine which hospital characteristics are associated with providing terrorism preparedness training to clinical staff.

Methods: Information from a Bioterrorism and Mass Casualty Supplement to the 2003 and 2004 National Hospital Ambulatory Medical Care Surveys was used to provide national estimates of variations in terrorism preparedness training by eight hospital characteristics. Of 874 hospitals in scope, 739 (84.

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Objectives: This study examined the content of hospital terrorism preparedness emergency response plans; whether those plans had been updated since September 11, 2001; collaboration of hospitals with outside organizations; clinician training in the management of biological, chemical, explosive, and nuclear exposures; drills on the response plans; and equipment and bed capacity.

Methods: The National Hospital Ambulatory Medical Care Survey (NHAMCS) is an annual survey of a probability sample of approximately 500 non-Federal general and short-stay hospitals in the United States. A Bioterrorism and Mass Casualty Supplement was included in the 2003 survey and provided the data for this analysis.

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The objective of this study was to examine the number and characteristics of National Health Service Corps (NHSC) alumni who currently practice with an underserved population. The study design was a cross-sectional survey mailed in 1998 to a sample of 2,160 alumni. The response rate was 58.

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Objective: This study examined factors associated with dentists continuing to provide care to the underserved populations beyond their National Health Service Corps (NHSC) obligation period.

Methods: Self-administered questionnaires were mailed in 1998 to 404 dentists who had completed their service obligation between 1980 and 1997. The outcome variable was dentist self-report of continuing to work with the underserved population past NHSC obligation.

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Synopsis of recent research by authors named "Richard Niska"

  • - Richard Niska's recent research focuses on public health challenges arising from the COVID-19 pandemic, particularly examining vaccination coverage and delays in children's preventive health services among military and civilian families in the United States.
  • - Niska has also contributed to HIV research, specifically addressing factors influencing false-negative results in rapid HIV testing and the impact of pre-exposure prophylaxis on bone mineral density among high-risk populations in Botswana.
  • - Additionally, Niska's work includes investigations into health service utilization in emergency departments and hospital preparedness for public health emergencies, aiming to improve responses to health crises and enhance preventive measures across various populations.