User profiles for "author:Velma Lopez"

Velma K Lopez

Centers for Disease Control and Prevention
Verified email at cdc.gov
Cited by 660

Evaluation of individual and ensemble probabilistic forecasts of COVID-19 mortality in the United States

EY Cramer, EL Ray, VK Lopez… - Proceedings of the …, 2022 - National Acad Sciences
Short-term probabilistic forecasts of the trajectory of the COVID-19 pandemic in the United
States have served as a visible and important communication channel between the scientific …

Ensemble forecasts of coronavirus disease 2019 (COVID-19) in the US

EL Ray, N Wattanachit, J Niemi, AH Kanji, K House… - MedRXiv, 2020 - medrxiv.org
Background The COVID-19 pandemic has driven demand for forecasts to guide policy and
planning. Previous research has suggested that combining forecasts from multiple models …

Evaluation of individual and ensemble probabilistic forecasts of COVID-19 mortality in the US

EY Cramer, EL Ray, VK Lopez, J Bracher, A Brennen… - Medrxiv, 2021 - medrxiv.org
Short-term probabilistic forecasts of the trajectory of the COVID-19 pandemic in the United
States have served as a visible and important communication channel between the scientific …

The burden of anaemia among displaced women and children in refugee settings worldwide, 2013–2016

A Kay, E Leidman, V Lopez, C Wilkinson, M Tondeur… - BMJ global …, 2019 - gh.bmj.com
Introduction Displaced persons have a unique risk for developing anaemia due to often
limited diets, overcrowding, new infections and inadequate sanitation and hygiene. The lack …

[HTML][HTML] Determinants of latrine use behavior: the psychosocial proxies of individual-level defecation practices in rural coastal Ecuador

VK Lopez, VJ Berrocal, BC Angulo… - The American journal …, 2019 - ncbi.nlm.nih.gov
There is increasing appreciation that latrine access does not imply use—many individuals
who own latrines do not consistently use them. Little is known, however, about the …

Breastfeeding support in low and middle-income countries: Secondary analysis of national survey data

K Peven, E Purssell, C Taylor, D Bick, VK Lopez - Midwifery, 2020 - Elsevier
Background Early initiation of breastfeeding and exclusive breastfeeding can reduce infant
mortality. Breastfeeding support interventions such as counselling may improve adherence …

[HTML][HTML] Distribution of enteroinvasive and enterotoxigenic Escherichia coli across space and time in northwestern Ecuador

D Bhavnani, R de los Ángeles Bayas… - The American Journal …, 2016 - ncbi.nlm.nih.gov
Although Escherichia coli infections are common throughout the developing world, their
prevalence patterns in space and over time are not well characterized. We used serial case …

Challenges of COVID-19 Case Forecasting in the US, 2020-2021

V Lopez, EY Cramer, R Pagano, JM Drake, EB O'Dea… - medRxiv, 2023 - medrxiv.org
During the COVID-19 pandemic, forecasting COVID-19 trends to support planning and
response was a priority for scientists and decision makers alike. In the United States, COVID …

[HTML][HTML] Shading in TXRF: calculations and experimental validation using a color X-ray camera

M Menzel, O Scharf, SH Nowak, M Radtke… - Journal of Analytical …, 2015 - pubs.rsc.org
Absorption effects in total reflection X-ray fluorescence (TXRF) analysis are important to
consider, especially if external calibration is to be applied. With a color X-ray camera (CXC) …

Observation of X-ray shadings in synchrotron radiation-total reflection X-ray fluorescence using a color X-ray camera

UEA Fittschen, M Menzel, O Scharf, M Radtke… - … Acta Part B: Atomic …, 2014 - Elsevier
Absorption effects and the impact of specimen shape on TXRF analysis has been discussed
intensively. Model calculations indicated that ring shaped specimens should give better …