Trending Topics pieces (Article Analyses, Evidence Clips and Other Topics) are published in timely response to recent media and journal articles, position statements, clinical guidelines, etc. Since they are based on the most recent evidence/publications, they may not be consistent with PEN evidence in other PEN content areas. As soon as possible, when this occurs, the PEN content will be reviewed and updated as needed.
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COVID-19 Trials and Research We Are Watching
Vitamin D Trial
Ongoing
The COVIDENCE UK Study is investigating how diet and lifestyle factors might influence the transmission of SARS-CoV-2, severity of COVID-19 symptoms, speed of recovery and any long-term effects. The researchers aim to recruit at least 12,000 people and to obtain interim results by this summer.
Vitamin C Trials
Completed
A review from the Cochrane Library on Vitamin C Supplementation for Prevention and Treatment of Pneumonia of seven studies (five RCTs and two quasi-RCTs) involving a total of 2,774 participants (five studies in children and two studies in adults). The authors concluded that evidence was insufficient to determine an effect of vitamin C because of the very low quality evidence. Other good quality studies are needed to assess the role of vitamin C supplements for pneumonia prevention and treatment.
A randomized control trial published in JAMA in January 2020 showing a lack of effectiveness of intravenous vitamin C, hydrocortisone and thiamine as compared to hydrocortisone alone in a quicker resolution of septic shock suggests that intravenous vitamin C is not likely to be effective for COVID-19 treatment.
Ongoing
Several clinical trials examining the effect of vitamin C supplementation (both intravenous and oral) on COVID-19 treatment and prevention from around the world have been registered with the U.S. National Library of Medicine's ClinicalTrials.gov database. Two specific trials are:
- A trial from Wuhan designed to provide more definitive answers about the effectiveness of intravenous vitamin C for the treatment of severe 2019-nCoV infected pneumonia is underway with an expected completion date of September 2020. This trial is designed to provide more definitive answers about the effectiveness of intravenous vitamin C for COVID-19.
- The LOVIT (Lessening Organ Dysfunction with VITamin C ) trial is a multi-centre trial currently being conducted in Canada and with recent approval in a number of other countries as well. It aims to find out if intravenous vitamin C in high doses can improve health outcomes, particularly mortality, in septic COVID-19 patients.
A New Site - LitCOVID
LitCOVID is new from PUBMED. It is a site to help scientists keep track of COVID-19 evidence publications.
*Word of Caution from PEN Evidence Analysts: Please keep in mind that these papers are being rushed to publication as the information is wanted as soon as possible. Some of these papers are not peer reviewed. Peer reviewing is not a perfect process but it does allow an unbiased scrutiny of the work by someone external to the research group and is known to lead to better quality work. See additional information from the Canadian Broadcasting Corporation (CBC): Scientists Cut Peer-Review Corners under Pressure of COVID-19 Pandemic.
Posted: 2020-05-22
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Should I Recommend Vitamin D Supplements to Protect Against COVID-19?
Recent narrative reviews have recommended vitamin D supplementation as a means of reducing the risk of catching or becoming ill from the SARS-CoV-2 (i.e. the virus that causes COVID-19). There is currently not enough evidence to indicate that vitamin D supplements can prevent or improve the course of COVID-19.
The Bottom Line:
- No studies have examined the effect of vitamin D to prevent or treat COVID-19 infections.
- Information extrapolated from randomized trials that examined respiratory tract infection prevention have not reported consistent beneficial effects of vitamin D compared to placebo in adults or children.
- Potential risks that have been identified include a higher rate of repeat episodes of pneumonia.
- While observational studies suggest that lower serum vitamin D levels are associated with inflammatory response, lower serum vitamin D levels are associated with other factors and not only with inadequate vitamin D intake.
- Vitamin D is an essential nutrient and vitamin D supplementation is recommended in a number of countries for various ages during the life cycle for general health.
For a full evaluation of the evidence, including the references, see the PEN Trending Topic: Can Vitamin D Supplements Prevent or Improve the Course of COVID-19?
Posted: 2020-05-01
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COVID-19 Trials and Research We Are Watching
Vitamin C Trials
A randomized control trial published in JAMA showing a lack of effectiveness of intravenous vitamin C, hydrocortisone and thiamine as compared to hydrocortisone alone in a quicker resolution of septic shock suggests that intravenous vitamin C is not likely to be effective for COVID-19 treatment.
A trial from the US National Library of Medicine ClinicalTrials.gov: Vitamin C Infusion for the Treatment of Severe 2019-nCoV Infected Pneumonia is underway (estimated completion September 2020). This trial is designed to provide more definitive answers about the effectiveness of intravenous vitamin C for COVID-19.
A New Site - LitCOVID
LitCOVID is new from PUBMED. It is a site to help scientists keep track of COVID-19 evidence publications.
*Word of Caution from PEN Evidence Analysts: Please keep in mind that these papers are being rushed to publication as the information is wanted ASAP. Some of these papers are not peer reviewed. While peer review is not a perfect process by any means, it does allow an unbiased review of the work by someone external to the research group.
Posted: 2020-04-07
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SARS-CoV-2 Virus Stability and Disinfecting
Two recent studies have emerged on the persistence of the coronavirus on various surfaces (1,2). Using an in vitro study, Van Doremalen et al. examined how long SARS-CoV-2 virus (i.e. the virus that causes COVID-19*) remained viable on four surfaces (cardboard, plastic, stainless steel and copper) for varying lengths of time (1). At room temperature and 40% humidity, viable SARS-CoV-2 viruses were detectable up to 24 hours on cardboard and up to 72 hours on stainless steel and plastic. The virus was not viable after four hours on copper.
Kampf et al. reported a review on coronavirus persistence on surfaces and materials (2). While this second study examined coronaviruses, it did not specifically study the SARS-CoV-2 virus; the authors suggest that they expect the persistence and inactivation of this new coronavirus are likely similar. They found that coronaviruses can remain potentially infectious from two hours up to nine days on various materials. At higher air temperatures of 30 to 40 °C, persistence was reduced compared to room temperatures. The studied viruses were stable (≥28 days) at refrigerator temperature, 4 °C. Humidity influenced persistence, as coronaviruses were less stable at 30% relative humidity compared to 50% relative humidity. The researchers also found that biocidal agents including 62-71% ethanol, 0.5% hydrogen peroxide or 0.2% sodium hypochlorite (bleach - preparation instructions below) used for disinfecting inactivated coronaviruses within one minute. Other biocidal agents were noted to be less effective.
Various organizations have now recommended guidelines based on the results of the first study. These include:
- Wash your hands thoroughly with soap and water for 20 seconds before and after preparing and eating food, using the washroom, after sneezing or coughing (3). Although the risk is low, if you are concerned or if you or someone in the household is of high risk, wash your hands after handling anything that might be contaminated such as cardboard, plastic and stainless steel (4).
- Disinfect hard surfaces daily including high touch areas such door handles, light switches, counter tops, tables, keyboards, toys, phones and TV remotes using ER-approved disinfectant (3).
- Refer to Health Canada’s Hard Surface Disinfectants and Hand Sanitizers (COVID-19) for instructions and for a list of effective disinfectants. Be sure to read manufacturers’ directions on the labels of the disinfectant cleaning product as many of these need to remain in contact with the surface for a period of time (e.g. 30 seconds) to be effective (e.g. do not just spray on and wipe off) (5).
- As these products are currently hard to find because of the COVID-19 pandemic, a solution of diluted bleach can also be used as per instructions on the label of the bleach container. For 5% sodium hypochlorite bleach (the usual concentration sold in stores) use 5 mL (1 tsp) per 250 mL (1 cup) of water or 20 mL (4 tsp) per 1 litre (4 cups) of water to make a 0.2% solution (5).
- Cleaning products remove germs and dirt, lowering their numbers and reducing the risk of spreading infections (5). Products with disinfectants kill germs.
*Note: SARS-CoV-2 is the name of the virus. COVID-19 is the disease the virus causes.
References
- van Doremalen N, Bushmaker T, Morris DH, Holbrook MG, Gamble A, Williamson BN, et al. Aerosol and surface stability of SARS-CoV-2 as compared with SARS-CoV-1. N Engl J Med. 2020 Mar 17. Abstract available from: https://www.ncbi.nlm.nih.gov/pubmed/?term=32182409
- Kampf G, Todt D, Pfaender S, Steinmann E. Persistence of coronaviruses on inanimate surfaces and their inactivation with biocidal agents. J Hosp Infect. 2020 Mar;104(3):246-51. Abstract available from: https://www.ncbi.nlm.nih.gov/pubmed/?term=32035997
- Health Canada. Coronavirus Disease (COVID-19): prevention and risks. 2020 Apr 1. Available from: https://www.canada.ca/en/public-health/services/diseases/2019-novel-coronavirus-infection/prevention-risks.html?topic=tilelink
- Harvard T.H. Chan. School of Public Health. Food Safety, nutrition, and wellness during COVID-19. 2020 Mar 25. Available from https://www.hsph.harvard.edu/nutritionsource/2020/03/25/food-safety-nutrition-and-wellness-during-covid-19/
- Health Canada. Hard surface disinfectants and hand sanitizers (COVID-19). 2020 Mar 30. Available from https://www.canada.ca/en/health-canada/services/drugs-health-products/disinfectants/covid-19.html
Posted: 2020-04-02
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Immunity, Nutrition and COVID-19
Have you been asked questions regarding the COVID-19 virus, immunity and nutrition? The following resources may help you answer them, see:
The novel coronavirus is new and evidence to support specific dietetic recommendations is not yet available in the scientific literature. The bottom line is that a healthy diet rich in fruit and vegetables, protein foods and whole grains is important for a strong immune system as are other healthy lifestyle habits (e.g exercise, not smoking, adequate sleep, managing stress etc). There is no one food or nutrient, supplement or herb that will protect you from the COVID-19 virus. The WHO has stated that there is no evidence that the consumption of garlic will prevent COVID-19. For this and other myth busters see WHO's advice for the public: myth busters. For more information about how to protect yourself and others, please follow the advice of your health authorities.
Posted: 2020-04-01