--- title: "COVID Vaccines Can Have Some Nasty Side Effects — But Only For a Day" description: "CNBC reports that side effects of several COVID vaccines can include high fever, exhaustion, and headaches. They mostly don't last for more than a day." date: "2020-10-01" modified: "2020-10-01" authors: - name: "Victor Tangermann" job_title: "Senior Editor" link: "https://futurism.com/authors/victor" url: "https://futurism.com/neoscope/covid-vaccines-side-effects" categories: - "Health & Medicine" - "Medical" - "Pathogens" - "Viruses" tags: - "coronavirus" - "covid19" - "vaccine" --- # COVID Vaccines Can Have Some Nasty Side Effects — But Only For a Day ![CNBC reports that side effects of several COVID vaccines can include high fever, exhaustion, and headaches. They mostly don't last for more than a day.]() *\Image: SELF Magazine via Flickr\* The entire world is waiting with bated breath for an effective and safe COVID-19 vaccine. Several companies, including pharmaceuticals Moderna and Pfizer, are currently testing out vaccine candidates on thousands of volunteers as part of double-blind phase three trials. And, as [*CNBC* reports](), the short term side effects in those trials are getting pretty nasty — but mostly subside after a single day and often less. And a little discomfort is almost certainly worth it compared to having no antibodies and being at risk of catching a sometimes-deadly disease that can last for [several months](). Five participants in the phase three trial talked to CNBC about their experiences. The main takeaway: COVID-19-like symptoms including chills and fevers were possible, particularly after getting a booster shot. A 44-year-old computational biologist named Luke Hutchison experienced chills and a fever over night, according to the report. Others experienced serious headaches, migraines, and exhaustion. Many participants joined private Facebook groups to discuss their experiences. The consensus, according to *CNBC*: take the day off after receiving a second dose. Plenty of other participants only experienced mild symptoms — but there's always the possibility they were in the control group receiving a saltwater solution instead of the vaccine. Florian Krammer, a virologist at the Icahn School of Medicine at Mount Sinai in New York, [tweeted]() that the self-reported side effects were "unpleasant but not dangerous" for Moderna's mRNA-based vaccine candidate. But that's to be expected. In fact, many other vaccines, such as a tetanus booster shot, can have similar effects. Experts now have the task of educating those who may see these side effects as a reason to not get the vaccine at all, as [*STAT* reported]() in July. Particularly in the US, where many people say they [don't trust vaccines](), it remains to be seen whether the majority of people will be willing to take a vaccine once a safe and effective candidate has been approved by regulators. Experts also worry that young people simply will take their chances with the virus rather than experience the side effects of a vaccine — which, of course, leaves them at risk of passing it along to more vulnerable populations. **READ MORE:** [Coronavirus vaccine trial participants report day-long exhaustion, fever and headaches — but say it’s worth it]() \[*CNBC*\] **More on COVID:** *[A Brazilian City May Have Had Enough COVID-19 Cases to Reach Herd Immunity]()* ## Author I've been at Futurism since 2017, where my role has evolved to encompass design, writing, and increasingly editing. I've always been fascinated by space exploration and advanced transportation, which I've leaned into by interviewing luminaries in those fields while closely following the dimensions of policy and regulation that allow next-generation projects to succeed -- or, sometimes, to fail. I'm also keenly interested in the effects of generative AI on society, policies, and democratic institutions, as well as clean energy, physics and biology, and the vagaries of tech leadership. My work for Futurism has been cited by publications including Ars Technica, Gizmodo, PC Magazine, Jalopnik, Fox News, and the New York Post. I spent my childhood living in locations including Manila, the Philippines, and Geneva, Switzerland, attended McGill University, and now live in Toronto, Canada. Before Futurism I worked at AskMen and a small photography studio. In my free time, I'm an avid gardener, foodie, and craft beer lover, as well as a maker of artisanal hot pepper sauces. I have a magnificent dog named Freida. ### Author social links [Bluesky]()