Minimizing Epidemic Viral Total Exposure under the Droplet and Aerosol Models

2021 ◽  
Author(s):  
Abdalaziz Sawwan ◽  
Jie Wu
Keyword(s):  
Total Exposure

scholarly journals Ethylene Oxide Exposure in U.S. Populations Residing Near Sterilization and Other Industrial Facilities: Context Based on Endogenous and Total Equivalent Concentration Exposures

2021 ◽  
Vol 18 (2) ◽  
pp. 607
Author(s):  
Patrick J. Sheehan ◽  
Ryan C. Lewis ◽  
Christopher R. Kirman ◽  
Heather N. Watson ◽  
Eric D. Winegar ◽  
...  
Keyword(s):  
Cancer Risk ◽  
Ethylene Oxide ◽  
Environmental Protection Agency ◽  
Cancer Risk Assessment ◽  
Exposure Concentration ◽  
Increase Cancer Risk ◽  
Total Exposure ◽  
Industrial Facilities ◽  
Equivalent Concentration ◽  
Current Risk

Given ubiquitous human exposure to ethylene oxide (EO), regardless of occupation or geography, the current risk-specific concentrations (RSCs: 0.0001–0.01 ppb) from the U.S. Environmental Protection Agency (EPA) cancer risk assessment for EO are not useful metrics for managing EO exposures to the general U.S. population. The magnitude of the RSCs for EO are so low, relative to typical endogenous equivalent metabolic concentrations (1.1–5.5 ppb) that contribute ~93% of total exposure, that the RSCs provide little utility in identifying excess environmental exposures that might increase cancer risk. EO monitoring data collected in the vicinity of eight EO-emitting facilities and corresponding background locations were used to characterize potential excess exogenous concentrations. Both 50th and 90th percentile exogenous exposure concentrations were combined with the 50th percentile endogenous exposure concentration for the nonsmoking population, and then compared to percentiles of total equivalent concentration for this population. No potential total exposure concentration for these local populations exceeded the normal total equivalent concentration 95th percentile, indicating that excess facility-related exposures are unlikely to require additional management to protect public health.

scholarly journals Use of Personal Protective Equipment and Operating Room Behaviors in Four Surgical Subspecialties: Personal Protective Equipment and Behaviors in Surgery

1999 ◽  
Vol 20 (02) ◽  
pp. 110-114 ◽  
Author(s):  
Deniz Akduman ◽  
Lynn E. Kim ◽  
Rodney L. Parks ◽  
Paul B. L'Ecuyer ◽  
Sunita Mutha ◽  
...  
Keyword(s):  
Operating Room ◽  
Personal Protective Equipment ◽  
Healthcare Workers ◽  
Tertiary Care ◽  
Hand Surgery ◽  
Occupational Exposures ◽  
Protective Equipment ◽  
Care Hospital ◽  
Exposure Rate ◽  
Total Exposure

AbstractObjective:To evaluate Universal Precautions (UP) compliance in the operating room (OR).Design:Prospective observational cohort. Trained observers recorded information about (1) personal protective equipment used by OR staff; (2) eyewear, glove, or gown breaks; (3) the nature of sharps transfers; (4) risk-taking behaviors of the OR staff; and (5) needlestick injuries and other blood and body-fluid exposures.Setting:Barnes-Jewish Hospital, a 1,000-bed, tertiary-care hospital affiliated with Washington University School of Medicine, St Louis, Missouri.Participants:OR personnel in four surgical specialties (gynecologic, orthopedic, cardiothoracic, and general). Procedures eligible for the study were selected randomly. Hand surgery and procedures requiring no or a very small incision (eg, arthroscopy, laparoscopy) were excluded.Results:A total of 597 healthcare workers' procedures were observed in 76 surgical cases (200 hours). Of the 597 healthcare workers, 32% wore regular glasses, and 24% used no eye protection. Scrub nurses and medical students were more likely than other healthcare workers to wear goggles. Only 28% of healthcare workers double gloved, with orthopedic surgery personnel being the most compliant. Sharps passages were not announced in 91% of the surgical procedures. In 65 cases (86%), sharps were adjusted manually. Three percutaneous and 14 cutaneous exposures occurred, for a total exposure rate of 22%.Conclusion:OR personnel had poor compliance with UP. Although there was significant variation in use of personal protective equipment between groups, the total exposure rate was high (22%), indicating the need for further training and reinforcement of UP to reduce occupational exposures.

scholarly journals Quantifying the Exposure to Antibiotic-Resistant Pathogens Among Patients Discharged From a Single Hospital Across All California Healthcare Facilities

2015 ◽  
Vol 36 (11) ◽  
pp. 1275-1282 ◽  
Author(s):  
Rupak Datta ◽  
Shawn Brown ◽  
Vinh Q. Nguyen ◽  
Chenghua Cao ◽  
John Billimek ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Nursing Homes ◽  
Hospital Readmissions ◽  
Time Dependent ◽  
Antibiotic Resistant ◽  
Total Exposure ◽  
Healthcare Facilities ◽  
Vancomycin Resistant Enterococci ◽  
Vancomycin Resistant

OBJECTIVETo assess the time-dependent exposure of California healthcare facilities to patients harboring methicillin-resistant Staphylococcus aureus (MRSA), vancomycin-resistant enterococci (VRE), extended-spectrum β-lactamase (ESBL)–producing Escherichia coli and Klebsiella pneumoniae, and Clostridium difficile infection (CDI) upon discharge from 1 hospital.METHODSRetrospective multiple-cohort study of adults discharged from 1 hospital in 2005–2009, counting hospitals, nursing homes, cities, and counties in which carriers were readmitted, and comparing the number and length of stay of readmissions and the number of distinct readmission facilities among carriers versus noncarriers.RESULTSWe evaluated 45,772 inpatients including those with MRSA (N=1,198), VRE (N=547), ESBL (N=121), and CDI (N=300). Within 1 year of discharge, MRSA, VRE, and ESBL carriers exposed 137, 117, and 45 hospitals and 103, 83, and 37 nursing homes, generating 58,804, 33,486, and 15,508 total exposure-days, respectively. Within 90 days of discharge, CDI patients exposed 36 hospitals and 35 nursing homes, generating 7,318 total exposure-days. Compared with noncarriers, carriers had more readmissions to hospitals (MRSA:1.8 vs 0.9/patient; VRE: 2.6 vs 0.9; ESBL: 2.3 vs 0.9; CDI: 0.8 vs 0.4; all P<.001) and nursing homes (MRSA: 0.4 vs 0.1/patient; VRE: 0.7 vs 0.1; ESBL: 0.7 vs 0.1; CDI: 0.3 vs 0.1; all P<.001) and longer hospital readmissions (MRSA: 8.9 vs 7.3 days; VRE: 8.9 vs 7.4; ESBL: 9.6 vs 7.5; CDI: 12.3 vs 8.2; all P<.01).CONCLUSIONSPatients harboring antibiotic-resistant pathogens rapidly expose numerous facilities during readmissions; regional containment strategies are needed.Infect. Control Hosp. Epidemiol. 2015;36(11):1275–1282

scholarly journals PARTICLE DARK MATTER IN THE GALACTIC HALO: RESULTS FROM DAMA/LIBRA

2012 ◽  
Vol 12 ◽  
pp. 37-47
Author(s):  
R. BERNABEI ◽  
P. BELLI ◽  
F. MONTECCHIA ◽  
F. NOZZOLI ◽  
F. CAPPELLA ◽  
...  
Keyword(s):  
Dark Matter ◽  
First Generation ◽  
Galactic Halo ◽  
National Laboratory ◽  
Annual Modulation ◽  
Independent Evidence ◽  
Total Exposure ◽  
Annual Cycles ◽  
Model Independent ◽  
Particle Dark Matter

The DAMA/LIBRA experiment, running at the Gran Sasso National Laboratory of the I.N.F.N. in Italy, has a sensitive mass of about 250 kg highly radiopure NaI(Tl). It is mainly devoted to the investigation of Dark Matter (DM) particles in the Galactic halo by exploiting the model independent DM annual modulation signature. The present DAMA/LIBRA experiment and the former DAMA/NaI one (the first generation experiment having an exposed mass of about 100 kg) have cumulatively released so far the results obtained with the data collected over 13 annual cycles; the total exposure is 1.17 ton × yr. They give a model independent evidence of the presence of DM particles in the galactic halo at 8.9 σ C.L. on the basis of the investigated DM signature. Few aspects of the obtained results are summarized and some comments addressed.

Total Exposure Health

2020 ◽  
pp. 3-29
Author(s):  
Kirk A. Phillips
Keyword(s):  
Total Exposure

scholarly journals Acrylamide in French fries prepared at primary school canteens

2020 ◽  
Vol 11 (2) ◽  
pp. 1489-1497 ◽  
Author(s):  
Marta Mesias ◽  
Cristina Delgado-Andrade ◽  
Francisca Holgado ◽  
Francisco J. Morales
Keyword(s):  
Primary School ◽  
French Fries ◽  
Total Exposure ◽  
Dietary Acrylamide

Children are one of the most exposed groups to dietary acrylamide with ‘potato fried products’ that account for up to half the total exposure to this contaminant.

scholarly journals BeppoSAX Observation of the Quasar 3C273

1998 ◽  
Vol 188 ◽  
pp. 434-435 ◽  
Author(s):  
T. Mineo ◽  
G. Cusumano ◽  
M. Guainazzi ◽  
P. Grandi
Keyword(s):  
Exposure Time ◽  
Total Exposure ◽  
Total Exposure Time

The quasar 3C273 was observed from 18th to 21st July 1996 with the Narrow Field Instruments (NFIs) onboard BeppoSAX satellite (Boella et al 1997). The total exposure time was 12 ksec for LECS, 131 ksec for MECS and 64 ksec for HPGSPC and PDS.

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