{"id":18975,"date":"2021-01-06T13:02:39","date_gmt":"2021-01-06T18:02:39","guid":{"rendered":"http:\/\/thepapergown.zocdoc.com\/?p=18975"},"modified":"2023-03-06T15:22:44","modified_gmt":"2023-03-06T20:22:44","slug":"what-to-know-about-the-second-shot","status":"publish","type":"post","link":"https:\/\/www.zocdoc.com\/blog\/guides\/what-to-know-about-the-second-shot\/","title":{"rendered":"What to Know About the Second Dose of the COVID Vaccine"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">The <a href=\"https:\/\/www.cdc.gov\/coronavirus\/2019-ncov\/vaccines\/different-vaccines\/Pfizer-BioNTech.html\">Pfizer<\/a> and <a href=\"https:\/\/www.cdc.gov\/coronavirus\/2019-ncov\/vaccines\/different-vaccines\/Moderna.html\">Moderna <\/a>vaccines both involve two injections a few weeks apart. The earliest COVID vaccine recipients, who rolled up their sleeves in mid-December, are now due for shot No. 2. <\/span><span style=\"font-weight: 400;\">As second doses get underway, however, some are calling them into question. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">The vaccine rollout \u2014 the largest mass-immunization effort in US history \u2014 is moving slower than hoped. As of January 6, nearly<\/span> <span style=\"font-weight: 400;\"><a href=\"https:\/\/covid.cdc.gov\/covid-data-tracker\/#vaccinations\">5.5 million people have received their first doses<\/a><\/span><b>,<\/b><span style=\"font-weight: 400;\"> a number far below the 20-million-by-NYE goal set by<\/span> <span style=\"font-weight: 400;\">the federal government. Distribution delays, as well as surging COVID cases and the recent emergence of a new, more virulent strain of the virus, have some policymakers and members of the medical community <\/span><a href=\"https:\/\/www.nytimes.com\/2021\/01\/03\/health\/coronavirus-vaccine-doses.html\"><span style=\"font-weight: 400;\">pushing for an alternative<\/span><\/a><span style=\"font-weight: 400;\"> to the two-dose schedule.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Is the second shot getting the boot? It\u2019s unlikely, experts say. Here\u2019s a breakdown of the one-shot-or-two debate, plus other things to know about the second shot.<\/span><\/p>\n<hr \/>\n<h2><span style=\"font-weight: 400;\">Why do you need a second dose?<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Based on the data we have, both the Pfizer and Moderna vaccines become <\/span><a href=\"https:\/\/www.cdc.gov\/vaccines\/covid-19\/hcp\/answering-questions.html\"><span style=\"font-weight: 400;\">maximally effective<\/span><\/a><span style=\"font-weight: 400;\"> after two doses.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The first \u201cpriming\u201d dose introduces your body to material from the virus that causes COVID-19. In response, your body starts building antibodies to protect you against future COVID infection.\u00a0 It takes a few weeks for your body to build these antibodies following the priming dose \u2014 as long as 21 days for the Pfizer vaccine and 28 days for the Moderna vaccine.\u00a0 <\/span><span style=\"font-weight: 400;\">The second \u201cbooster\u201d shot strengthens your immune response. After that, <\/span><span style=\"font-weight: 400;\">it takes about one to two weeks for the vaccine to become effective.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Efficacy after one dose of the Pfizer vaccine <\/span><a href=\"https:\/\/www.cdc.gov\/vaccines\/covid-19\/info-by-product\/clinical-considerations.html\"><span style=\"font-weight: 400;\">is estimated<\/span><\/a><span style=\"font-weight: 400;\"> to be 52 percent, vs. 95 percent after two. <\/span><span style=\"font-weight: 400;\">The Moderna vaccine showed similar (though not identical) efficacy in trials, and appears to take about two weeks after the second dose to kick in.\u00a0<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Do the first and second doses have similar side effects?\u00a0<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Early reports indicate that side effects from the first and second doses of the Pfizer vaccine are similar in type and severity. The most common ones are pain, swelling and redness at the injection site; fatigue; headaches; and muscle and joint pain. While these post-shot symptoms might be unpleasant and unnerving, they aren\u2019t dangerous. In fact, they\u2019re a sign that your immune system is responding to the vaccine the way it\u2019s supposed to.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">With that said, healthcare professionals anecdotally report slightly<\/span> <span style=\"font-weight: 400;\">more pronounced side effects after the second dose.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cBased on the <\/span><a href=\"https:\/\/www.fda.gov\/media\/144245\/download\"><span style=\"font-weight: 400;\">FDA analysis<\/span><\/a><span style=\"font-weight: 400;\">, the side effects or symptoms people complain about after getting the second Pfizer dose are very similar to those of the first dose,\u201d says <\/span><a href=\"https:\/\/med.uth.edu\/pediatrics\/faculty\/michael-l-chang-m-d\/\"><span style=\"font-weight: 400;\">Dr. Michael Chang<\/span><\/a><span style=\"font-weight: 400;\">, an infectious disease physician at UTHealth in Houston. \u201cBut I have heard reports of people complaining more of fatigue after the second dose.\u201d<\/span><\/p>\n<blockquote><p><span style=\"font-weight: 400;\">&#8220;The first dose primed your immune system, and now your immune system is ready to react a bit more briskly.\u201d\u00a0<\/span><\/p><\/blockquote>\n<p><span style=\"font-weight: 400;\">Second doses of the Moderna vaccine are not yet being administered in the US. But trials indicate side effects from the second dose may last longer \u2014 \u201cfrom two to three days after the first dose to four to five days for the swelling and tenderness to resolve after the second dose,\u201d Chang says.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Chang <\/span>also mentions reports<span style=\"font-weight: 400;\"> of lymph nodes in the neck and under the armpit (of the vaccinated arm) becoming swollen and\/or tender after the second dose. \u201cIt makes sense they\u2019d be inflamed,\u201d Chang says. \u201cThat\u2019s a good thing. The first dose primed your immune system, and now your immune system is ready to react a bit more briskly.\u201d\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Having no side effects is a normal, healthy reaction too. \u201cEveryone responds differently,\u201d Chang says. \u201cIf you have symptoms after both doses, or no symptoms after either, that\u2019s fine.\u201d<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">How\u2019s the second-dose rollout going?<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Well, it&#8217;s only just starting.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cOur first round of healthcare providers is getting their second doses this week,\u201d Chang says. \u201cSo far, as I\u2019ve heard, that\u2019s going well. Our hospital has a good distribution plan. The follow-up for the second dose was immediately scheduled after people got their first dose, so they are getting their second doses on time. It seems to be going smoothly.\u201d<\/span><\/p>\n<p><span style=\"font-weight: 400;\">That said, bigger healthcare systems are dealing with logistical and even ethical issues that may lead to changes in how COVID vaccines are administered once they&#8217;re available to the general public. \u201cEverybody is building the plane as it\u2019s flying,\u201d says <\/span><a href=\"https:\/\/stanfordhealthcare.org\/doctors\/l\/anne-liu.html\"><span style=\"font-weight: 400;\">Dr. Anne Liu<\/span><\/a><span style=\"font-weight: 400;\">, an infectious disease physician at Stanford Health Care<\/span><span style=\"font-weight: 400;\">. \u201cLarge institutions are seeing how difficult it is to do something like this quickly. We\u2019re having to account for equity and access \u2014 lots of issues have been raised. At Stanford, we\u2019re trying to vaccinate 36,000 healthcare professionals \u2014 it\u2019s several orders of magnitude greater than what smaller institutions are doing. But the processes are getting smoother. When I got mine, it was quick and easy.\u201d<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Should we focus on getting single doses to as many people as possible instead?<\/span><\/h2>\n<p>In clinical trials for the Pfizer and Moderna vaccines, participants who received only a single vaccine dose were much less likely to get COVID than placebo group members, who got no vaccine whatsoever.<\/p>\n<p><span style=\"font-weight: 400;\">Based on that, it might seem like the best way to allocate a limited vaccine supply would be to give the vaccine to as many people as possible, even if that means only administering single doses for now. Unfortunately, it\u2019s not as simple as choosing to give one dose to tons of people vs. two doses to a smaller group. Both the Pfizer and Moderna vaccines require two doses to work the way they\u2019re supposed to. The FDA approved the optimal versions of the vaccines, and only those versions.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cWhen you look at single-dose data from the FDA papers on both vaccines, there\u2019s a trend that, after a single dose, it may be effective,\u201d Chang says. \u201cPfizer reported that its vaccine is 82 percent effective after the first dose. But this is for a population that didn\u2019t complete the vaccination with a second dose. For those who got the first dose, the vaccine was 51 percent effective in the 21 days between doses. There\u2019s a chance a single dose is effective, but you\u2019re extrapolating data the study wasn\u2019t designed to answer.\u201d<\/span><\/p>\n<blockquote><p><span style=\"font-weight: 400;\">\u201cFrom a public health messaging standpoint, changing out vaccination recommendations will be problematic, to say the least.&#8221;<\/span><\/p><\/blockquote>\n<p><span style=\"font-weight: 400;\">He continues, \u201cThat\u2019s a risky extrapolation. You don\u2019t know if you expand the single dose plan to a bunch of people that you\u2019ll achieve anything like you want to achieve. With respect to how this vaccine is going to work, lean towards the sure thing versus <\/span><i><span style=\"font-weight: 400;\">this might work<\/span><\/i><span style=\"font-weight: 400;\">.\u201d<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Also, the proposal to give people only enough of a vaccine to confer partial immunity implies we don\u2019t have enough to go around. But that\u2019s not really the case.<\/span><\/p>\n<p>\u201cI do not think we have a shortage of vaccines at the moment, where this approach may make more sense,\u201d says <a href=\"https:\/\/www.zocdoc.com\/doctor\/chad-sanborn-md\">Dr. Chad Sanborn<\/a>, a pediatric infectious disease specialist at KIDZ Medical Services in West Palm Beach, Florida. \u201cRather, we have more of a problem getting it out to enough people in a timely manner. I don\u2019t know that giving only one dose to a lot of people would be accomplished that much quicker; we need improvements in vaccine distribution and administration, not supply.\u201d<\/p>\n<p><span style=\"font-weight: 400;\">Sanborn also points out that upending the distribution strategy we just started implementing could undermine the ongoing efforts to immunize everybody. \u201cFrom a public health messaging standpoint, changing out vaccination recommendations will be problematic, to say the least,\u201d Sanborn says. \u201cThere certainly have been issues with getting the public to trust our public health institutions with the ever-changing advice. If we do this again, that damages that trust.\u201d<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The CDC and <\/span><span style=\"font-weight: 400;\">FDA <\/span><a href=\"https:\/\/www.fda.gov\/news-events\/press-announcements\/fda-statement-following-authorized-dosing-schedules-covid-19-vaccines\"><span style=\"font-weight: 400;\">have made it clear<\/span><\/a> <span style=\"font-weight: 400;\">that deviating from the current two-dose schedule poses a significant public health risk<\/span><span style=\"font-weight: 400;\">, noting that proposed changes are \u201cpremature and not rooted solidly in the available evidence.\u201d And yet, the debate continues, even within the medical community.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cThat\u2019s the disconnect between data-driven decision-making and policy that has to happen in an emergency,\u201d Chang says. \u201cWouldn\u2019t it be great to have confidence in a single-dose solution? I wish that the study had been designed that way in the first place so the medical community could be more in agreement.\u201d<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Chang advises keeping the overall goal of a study in mind when looking at pieces of it. In this case, Pfizer and Moderna carried out clinical testing to find a safe and effective COVID vaccine \u2014 and vaccine schedule \u2014\u00a0and that\u2019s what they\u2019ve achieved.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cJust because you see a result in the data doesn\u2019t mean you can draw a conclusion from that result,\u201d Chang says. \u201cI\u2019ve seen social media posts that suggest Asian people should get the Pfizer vaccine, that it works better for them. The study was not designed to answer that question, at all. This is based on one case in four \u2014 that\u2019s not enough to make that conclusion. When you look at sub-groups, you take a lot out of it \u2014 and you\u2019re not answering the question you thought you were.\u201d<\/span><\/p>\n<hr \/>\n<h1 class=\"p1\" style=\"text-align: center;\"><span class=\"s1\">Ready to book a doctor&#8217;s appointment? Visit <a href=\"https:\/\/www.zocdoc.com\/\"><span class=\"s2\">Zocdoc.<\/span><\/a><\/span><\/h1>\n","protected":false},"excerpt":{"rendered":"<p>As early vaccine recipients start to get their second shots, some argue against a two-dose vaccine regimen. Do they have a point? <\/p>\n","protected":false},"author":20,"featured_media":18811,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[227],"tags":[165,93],"class_list":["post-18975","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-guides","tag-covid-vaccine","tag-public-health","reviewer-dr-nassim-assefi"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What to Know About the Second Dose of the COVID Vaccine - Guides<\/title>\n<meta name=\"description\" content=\"As early vaccine recipients start to get their second shots, some argue against a two-dose vaccine regimen. 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