Publications by authors named "Christopher Colombo"

Article Synopsis
  • The study examined 595 SARS-CoV-2 sequences from Military Health System beneficiaries to assess how vaccination affected viral diversity from December 2020 to April 2022.
  • Results indicated that vaccination had limited influence on the diversity of the SARS-CoV-2 spike protein and showed little evidence of a significant sieve effect among major variants.
  • The findings suggest that during periods of rapid variant replacement, other factors overshadowed the influence of vaccination on viral diversity, and caution is needed when using sieve analysis methods in non-clinical trial settings.
View Article and Find Full Text PDF

Background: Post-COVID conditions (PCC) are difficult to characterize, diagnose, predict, and treat due to overlapping symptoms and poorly understood pathology. Identifying inflammatory profiles may improve clinical prognostication and trial endpoints.

Methods: 1,988 SARS-CoV-2 positive U.

View Article and Find Full Text PDF

The COVID-19 pandemic caused tremendous disruption to the U.S. healthcare system and nearly crippled some hospitals during large patient surges.

View Article and Find Full Text PDF

Objectives: To determine the impact of telementoring on caregiver performance during a high-fidelity medical simulation model (HFMSM) of a critically ill patient in a resource-limited setting.

Design: A two-center, randomized, controlled study using a HFMSM of a patient with community-acquired pneumonia complicated by acute respiratory distress syndrome.

Setting: A notional clinic in a remote location staffed by a single clinician and nonmedical assistant.

View Article and Find Full Text PDF

Background: Chronic neuropsychological sequelae following SARS-CoV-2 infection, including depression, anxiety, fatigue, and general cognitive difficulties, are a major public health concern. Given the potential impact of long-term neuropsychological impairment, it is important to characterize the frequency and predictors of this post-infection phenotype.

Methods: The Epidemiology, Immunology, and Clinical Characteristics of Emerging Infectious Diseases with Pandemic Potential (EPICC) study is a longitudinal study assessing the impact of SARS-CoV-2 infection in U.

View Article and Find Full Text PDF

Background: The long-term effects of coronavirus disease 2019 (COVID-19) on physical fitness are unclear, and the impact of vaccination on that relationship is uncertain.

Methods: We compared survey responses in a 1-year study of US military service members with (n = 1923) and without (n = 1591) a history of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. We fit Poisson regression models to estimate the association between history of SARS-CoV-2 infection and fitness impairment, adjusting for time since infection, demographics, and baseline health.

View Article and Find Full Text PDF

Introduction: U.S. Military healthcare providers increasingly perform prolonged casualty care because of operations in settings with prolonged evacuation times.

View Article and Find Full Text PDF
Article Synopsis
  • Clinical trials during infectious disease outbreaks like COVID-19 often face challenges in quickly enrolling a representative study population, which can impact treatment identification against morbidity and mortality.
  • The study assessed participant demographics in the Adaptive COVID-19 Treatment Trial (ACTT) by comparing enrolled data against COVID-19 surveillance networks and US Census information, focusing on sex, race, ethnicity, and age.
  • Results showed that while ACTT's demographic makeup somewhat aligned with COVID-NET data, it highlighted discrepancies such as a lower proportion of females enrolled compared to reference datasets, indicating that using surveillance data is more relevant than census data in understanding the affected population.
View Article and Find Full Text PDF

Background: Accurate COVID-19 prognosis is a critical aspect of acute and long-term clinical management. We identified discrete clusters of early stage-symptoms which may delineate groups with distinct disease severity phenotypes, including risk of developing long-term symptoms and associated inflammatory profiles.

Methods: 1,273 SARS-CoV-2 positive U.

View Article and Find Full Text PDF

Importance: Understanding the factors associated with post-COVID conditions is important for prevention.

Objective: To identify characteristics associated with persistent post-COVID-19 symptoms and to describe post-COVID-19 medical encounters.

Design, Setting, And Participants: This cohort study used data from the Epidemiology, Immunology, and Clinical Characteristics of Emerging Infectious Diseases With Pandemic Potential (EPICC) study implemented in the US military health system (MHS); MHS beneficiaries aged 18 years or older who tested positive for SARS-CoV-2 from February 28, 2020, through December 31, 2021, were analyzed, with 1-year follow-up.

View Article and Find Full Text PDF
Article Synopsis
  • The study assessed the progression of COVID-19 treatment standards (SOC) and their impact on patient recovery and mortality rates during 2020-2021, using data from the Adaptive COVID-19 Treatment Trial (ACTT).
  • Results indicated that outcomes improved significantly from ACTT-2 to ACTT-3, with notable reductions in mortality and intubation rates, although the improvements from ACTT-1 to ACTT-2 were less pronounced.
  • The analysis also explored various factors that could explain these trends, including changes in SOC, surges in COVID-19 cases, and the emergence of different virus variants, highlighting an increase in the use of dexamethasone in later trials.
View Article and Find Full Text PDF

Point-of-Care ultrasound (POCUS) is an invaluable tool permitting the understanding of critical physiologic and anatomic details wherever and whenever a patient has a medical need. Thus the application of POCUS has dramatically expanded beyond hospitals to become a portable user-friendly technology in a variety of prehospital settings. Traditional thinking holds that a trained user is required to obtain images, greatly handicapping the scale of potential improvements in individual health assessments.

View Article and Find Full Text PDF

Background: There is limited information on the functional consequences of coronavirus disease 2019 (COVID-19) vaccine side effects. To support patient counseling and public health messaging, we describe the risk and correlates of COVID-19 vaccine side effects sufficient to prevent work or usual activities and/or lead to medical care ("severe" side effects).

Methods: The EPICC study is a longitudinal cohort study of Military Healthcare System beneficiaries including active duty service members, dependents, and retirees.

View Article and Find Full Text PDF

Background: Patient-reported outcomes of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection are an important measure of the full burden of coronavirus disease (COVID). Here, we examine how (1) infecting genotype and COVID-19 vaccination correlate with inFLUenza Patient-Reported Outcome (FLU-PRO) Plus score, including by symptom domains, and (2) FLU-PRO Plus scores predict return to usual activities and health.

Methods: The idemiology, mmunology, and linical haracteristics of pandemic infectious diseases (EPICC) study was implemented to describe the short- and long-term consequences of SARS-CoV-2 infection in a longitudinal, observational cohort.

View Article and Find Full Text PDF

Study Objectives: Obstructive sleep apnea (OSA) is increasingly common among military personnel, but diagnostic capabilities are challenged by limited capability for polysomnography (PSG). We sought to evaluate the diagnostic properties of peripheral arterial tonometry (PAT)-based home sleep apnea testing (HSAT) to accurately identify and classify OSA among active-duty military personnel.

Methods: This study was a retrospective review of all patients suspected of having OSA who completed an initial PAT-based HSAT followed by confirmatory PSG within 120 days.

View Article and Find Full Text PDF

A 23-year-old woman presented 4 days postpartum for agitation and confusion, with initial evaluation consistent with acute fatty liver of pregnancy (AFLP). Later in her course, an amino acid panel was highly suggestive of citrullinemia type 1. She was started on arginine supplementation and glycerol phenylbutyrate and evaluated for a liver transplant.

View Article and Find Full Text PDF

The Seraph-100™ is a purification filter that blunts cytokine storm, providing a more favorable environment to establish immune homeostasis. We present a novel case of compassionate use of Seraph filter in a young, healthy active duty service member with heat injury-induced massive inflammatory response. The patient is a previously healthy 26-year-old male with altered mental status, tachycardia, fever to 40.

View Article and Find Full Text PDF

The rapid spread of the highly contagious Omicron variant of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) along with its high number of mutations in the spike gene has raised alarms about the effectiveness of current medical countermeasures. To address this concern, we measured the neutralization of the Omicron BA.1 variant pseudovirus by postvaccination serum samples after two and three immunizations with the Pfizer/BioNTech162b2 SARS-CoV-2 mRNA (Pfizer/BNT162b2) vaccine, convalescent serum samples from unvaccinated individuals infected by different variants, and clinical-stage therapeutic antibodies.

View Article and Find Full Text PDF

Background: Nasopharyngeal (NP) swabs are the standard for SARS-CoV-2 diagnosis. If less invasive alternatives to NP swabs (eg, oropharyngeal [OP] or nasal swabs [NS]) are comparably sensitive, the use of these techniques may be preferable in terms of comfort, convenience, and safety.

Methods: This study compared the detection of SARS-CoV-2 in swab samples collected on the same day among participants with at least one positive PCR test.

View Article and Find Full Text PDF

Unlabelled: The rapid spread of the highly contagious Omicron variant of SARS-CoV-2 along with its high number of mutations in the spike gene has raised alarm about the effectiveness of current medical countermeasures. To address this concern, we measured neutralizing antibodies against Omicron in three important settings: (1) post-vaccination sera after two and three immunizations with the Pfizer/BNT162b2 vaccine, (2) convalescent sera from unvaccinated individuals infected by different variants, and (3) clinical-stage therapeutic antibodies. Using a pseudovirus neutralization assay, we found that titers against Omicron were low or undetectable after two immunizations and in most convalescent sera.

View Article and Find Full Text PDF

Background: We evaluated clinical outcomes, functional burden, and complications 1 month after coronavirus disease 2019 (COVID-19) infection in a prospective US Military Health System (MHS) cohort of active duty, retiree, and dependent populations using serial patient-reported outcome surveys and electronic medical record (EMR) review.

Methods: MHS beneficiaries presenting at 9 sites across the United States with a positive severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) test, a COVID-19-like illness, or a high-risk SARS-CoV-2 exposure were eligible for enrollment. Medical history and clinical outcomes were collected through structured interviews and International Classification of Diseases-based EMR review.

View Article and Find Full Text PDF

Background: The inFLUenza Patient-Reported Outcome Plus (FLU-PRO Plus) is a patient-reported outcome data collection instrument assessing symptoms of viral respiratory tract infections across 8 body systems. This study evaluated the measurement properties of FLU-PRO Plus in a study enrolling individuals with coronavirus disease 2019 (COVID-19).

Methods: Data from a prospective cohort study (EPICC) in US Military Health System beneficiaries evaluated for COVID-19 was utilized.

View Article and Find Full Text PDF