Title |
Impact of SARS-CoV-2 vaccination and booster on COVID-19 symptom severity over time in the COVID-OUT trial
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Published in |
Clinical Infectious Diseases, September 2022
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DOI | 10.1093/cid/ciac772 |
Pubmed ID | |
Authors |
David R Boulware, Thomas A Murray, Jennifer L Proper, Christopher J Tignanelli, John B Buse, David M Liebovitz, Jacinda M Nicklas, Kenneth Cohen, Michael A Puskarich, Hrishikesh K Belani, Lianne K Siegel, Nichole R Klatt, David J Odde, Amy B Karger, Nicholas E Ingraham, Katrina M Hartman, Via Rao, Aubrey A Hagen, Barkha Patel, Sarah L Fenno, Nandini Avula, Neha V Reddy, Spencer M Erickson, Sarah Lindberg, Regina Fricton, Samuel Lee, Adnin Zaman, Hanna G Saveraid, Walker J Tordsen, Matthew F Pullen, Nancy E Sherwood, Jared D Huling, Carolyn T Bramante, for the COVID-OUT study team |
Abstract |
SARS-CoV-2 vaccination has decreasing protection from acquiring any infection with emergence of new variants; however, vaccination continues to protect against progression to severe COVID-19. The impact of vaccination status on symptoms over time is less clear. Within a randomized trial on early outpatient COVID-19 therapy testing metformin, ivermectin, and/or fluvoxamine, participants recorded symptoms daily for 14 days. Participants were given a paper symptom diary allowing them to circle the severity of 14 symptoms as none (0), mild (1), moderate (2), or severe (3). This is a secondary analysis of clinical trial data on symptom severity over time using generalized estimating equations comparing those unvaccinated, SARS-CoV-2 vaccinated with primary vaccine series only, or vaccine-boosted. The parent clinical trial prospectively enrolled 1323 participants, of whom 1062 (80%) prospectively recorded some daily symptom data. Of these, 480 (45%) were unvaccinated, 530 (50%) were vaccinated with primary series only, and 52 (5%) vaccine-boosted. Overall symptom severity was least for the vaccine-boosted group and most severe for unvaccinated at baseline and over the 14 days (P < 0.001). Individual symptoms were least severe in the vaccine-boosted group including: cough, chills, fever, nausea, fatigue, myalgia, headache, and diarrhea, as well as smell and taste abnormalities. Results were consistent over delta and omicron variant time periods. SARS-CoV-2 vaccine-boosted participants had the least severe symptoms during COVID-19 which abated the quickest over time. |
X Demographics
Geographical breakdown
Country | Count | As % |
---|---|---|
Japan | 174 | 19% |
United States | 89 | 10% |
Canada | 12 | 1% |
United Kingdom | 7 | <1% |
Belgium | 6 | <1% |
France | 6 | <1% |
Australia | 4 | <1% |
India | 4 | <1% |
Germany | 3 | <1% |
Other | 34 | 4% |
Unknown | 567 | 63% |
Demographic breakdown
Type | Count | As % |
---|---|---|
Members of the public | 828 | 91% |
Scientists | 41 | 5% |
Practitioners (doctors, other healthcare professionals) | 29 | 3% |
Science communicators (journalists, bloggers, editors) | 7 | <1% |
Unknown | 1 | <1% |
Mendeley readers
Geographical breakdown
Country | Count | As % |
---|---|---|
Unknown | 23 | 100% |
Demographic breakdown
Readers by professional status | Count | As % |
---|---|---|
Student > Master | 3 | 13% |
Student > Bachelor | 2 | 9% |
Student > Postgraduate | 2 | 9% |
Student > Ph. D. Student | 2 | 9% |
Unspecified | 1 | 4% |
Other | 2 | 9% |
Unknown | 11 | 48% |
Readers by discipline | Count | As % |
---|---|---|
Medicine and Dentistry | 4 | 17% |
Nursing and Health Professions | 2 | 9% |
Unspecified | 1 | 4% |
Biochemistry, Genetics and Molecular Biology | 1 | 4% |
Psychology | 1 | 4% |
Other | 1 | 4% |
Unknown | 13 | 57% |