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Sunlight COVID-19 studies. Recent:
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Feb 1
Covid Analysis (Preprint) (meta analysis) Sunlight for COVID-19: real-time meta analysis of 4 studies
Statistically significant improvements are seen for mortality and cases. 4 studies from 4 independent teams in 3 different countries show statistically significant improvements in isolation. • Meta analysis using the most serious outcom..
Jan 18
Socia et al., medRxiv, doi:10.1101/2023.01.16.23284634 (Preprint) Prediction of Long COVID Based on Severity of Initial COVID-19 Infection: Differences in predictive feature sets between hospitalized versus non-hospitalized index infections
N3C retrospective identifying plant hardiness zone as a predictive variable for long COVID. Authors note that this may be due to sunlight/climate affecting the risk of long COVID, and plan more detailed analysis in future work.
Nov 24
Khandker et al., Frontiers in Rehabilitation Sciences, doi:10.3389/fresc.2022.1037649 Post-COVID-19 complications in home and hospital-based care: A study from Dhaka city, Bangladesh
Retrospective 925 COVID-19 patients in Bangladesh reporting that "physical activity and exposure to sunlight was positively associated with earlier recovery from COVID-19 both in home and hospital care". Details are not provided.
Apr 26
Kalichuran et al., Southern African Journal of Infectious Diseases, doi:10.4102/sajid.v37i1.359 Vitamin D status and COVID-19 severity
58% fewer symptomatic cases [p=0.004]. Prospective study of 100 COVID-19 patients in South Africa, 50 with COVID-19 pneumonia and 50 asymptomatic, showing higher risk of symptomatic COVID-19 with lower exposure to sunlight, and with vitamin D deficiency. Sunlight exposure may ..
Dec 31
Jabbar et al., Nat. Volatiles & Essent. Oils, 8:4 Vitamin D Serum Levels and Its Association With COVID 19 Infection In Babylon Governorate, Iraq
63% fewer cases [p=0.0002]. Analysis of 120 COVID-19 and 120 control patients in Iraq, showing lower risk of cases with regular sunlight exposure (3 times/week).
Dec 3
Ma et al., The American Journal of Clinical Nutrition, doi:10.1093/ajcn/nqab389 Associations between predicted vitamin D status, vitamin D intake, and risk of SARS-CoV-2 infection and Coronavirus Disease 2019 severity
23% fewer cases [p=0.0001]. Analysis of 39,915 patients with 1,768 COVID+ cases based on surveys in the Nurses' Health Study II, showing higher UVA/UVB exposure associated with lower risk of COVID-19 cases.
Oct 31
Erem et al., The Journal of Steroid Biochemistry and Molecular Biology, doi:10.1016/j.jsbmb.2021.105957 (Review) Vitamin D-independent benefits of safe sunlight exposure
Review of the benefits of sunlight exposure independent of vitamin D.
Oct 5
Mukherjee et al., FEBS Open Bio, doi:10.1002/2211-5463.13309 Seasonal UV exposure and vitamin D: Association with the dynamics of COVID-19 transmission in Europe
Analysis of UV exposure in 26 European countries, showing that cloud-free vitamin D UV dose levels were negatively correlated with COVID-19 prevalence.
Jul 7
González-Estevez et al., International Journal of Environmental Research and Public Health, doi:10.3390/ijerph18147266 Association of Food Intake Quality with Vitamin D in SARS-CoV-2 Positive Patients from Mexico: A Cross-Sectional Study
Retrospective 40 COVID+ patients in Mexico, showing vitamin D insufficiency associated with lower sun exposure.
Jun 30
Sharun et al., Annals of Medicine and Surgery, doi:10.1016/j.amsu.2021.102419 (Review) COVID-19 and sunlight: Impact on SARS-CoV-2 transmissibility, morbidity, and mortality
Review of evidence for the benefits of sunlight exposure for COVID-19.
Apr 8
Cherrie et al., British Journal of Dermatology, doi:10.1111/bjd.20093 Ultraviolet A radiation and COVID‐19 deaths in the USA with replication studies in England and Italy*
32% lower mortality [p=0.004]. Analysis of UVA exposure and COVID-19 mortality in the USA, England, and Italy, showing increase UVA exposure associated with lower mortality.
Feb 28
Isaia et al., Science of The Total Environment, doi:10.1016/j.scitotenv.2020.143757 Does solar ultraviolet radiation play a role in COVID-19 infection and deaths? An environmental ecological study in Italy
Retrospective COVID-19 cases and solar UV exposure in Italy, showing mortality and cases negatively correlated with solar UV exposure.
Dec 28
Carleton et al., Proceedings of the National Academy of Sciences, doi:10.1073/pnas.2012370118 Global evidence for ultraviolet radiation decreasing COVID-19 growth rates
Global analysis of UV radiation and COVID-19 cases, showing that higher UV radiation is associated with a lower daily growth rate of COVID-19 cases.
Oct 19
Moozhipurath et al., Scientific Reports, doi:10.1038/s41598-020-74825-z Evidence of protective role of Ultraviolet-B (UVB) radiation in reducing COVID-19 deaths
Analysis of 152 countries suggesting that a permanent unit increase in UVI is associated with a 1.2 percentage points decline in daily growth rates of cumulative COVID-19 deaths.
Sep 28
Nakada et al., Environmental Science and Pollution Research, doi:10.1007/s11356-020-10930-w COVID-19 pandemic: environmental and social factors influencing the spread of SARS-CoV-2 in São Paulo, Brazil
Analysis of COVID-19 in Brazil, showing a negative correlation between cases and UV radiation.
Aug 31
Asyary et al., Science of The Total Environment, doi:10.1016/j.scitotenv.2020.139016 Sunlight exposure increased Covid-19 recovery rates: A study in the central pandemic area of Indonesia
Analysis of COVID-19 cases in Indonesia, showing recovery significantly correlated with sunlight exposure.
Jul 23
Lansiaux et al., Spatial and Spatio-temporal Epidemiology, doi:10.1016/j.sste.2020.100362 Covid-19 and vit-d: Disease mortality negatively correlates with sunlight exposure
Analysis of COVID-19 mortality and sunlight exposure in continental metropolitan France, showing that average annual sunlight hours were significantly correlated with COVID-19 mortality, with a Pearson coefficient of -0.636.
Jun 2
Li et al., Research Square, doi:10.21203/ (Preprint) Sunlight and vitamin D in the prevention of coronavirus disease (COVID-19) infection and mortality in the United States
Analysis of COVID-19 cases in the USA reporting a potential relationship between latitude and the number of COVID-19 cases (p = 0.08) and deaths (p=0.06). Authors note that sunlight and vitamin D may reduce risk for COVID-19 cases and dea..
May 20
Ratnesar-Shumate et al., The Journal of Infectious Diseases, doi:10.1093/infdis/jiaa274 (In Vitro) Simulated Sunlight Rapidly Inactivates SARS-CoV-2 on Surfaces
In Vitro study showing that simulated sunlight rapidly inactivates SARS-CoV-2 on surfaces.
May 19
Guasp et al., Clinical Infectious Diseases, doi:10.1093/cid/ciaa575 Higher Solar Irradiance Is Associated With a Lower Incidence of Coronavirus Disease 2019
Analysis of 359 countries and regions showing COVID-19 cases associated with reduced solar irradiance.
Apr 17
Ahmadi et al., Science of The Total Environment, doi:10.1016/j.scitotenv.2020.138705 Investigation of effective climatology parameters on COVID-19 outbreak in Iran
Analysis of COVID-19 in Iran, showing cases inversely related to solar radiation, without statistical significance.
Jul 31
Grant et al., Dermato-Endocrinology, doi:10.4161/derm.1.4.9063 The possible roles of solar ultraviolet-B radiation and vitamin D in reducing case-fatality rates from the 1918–1919 influenza pandemic in the United States
Analysis of the 1918–1919 influenza pandemic for 12 US states, showing estimated UVB dose correlated with case fatality rates (p = 0.009) and with pneumonia as a complication of influenza (p = 0.005).
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