{"id":22150,"date":"2021-07-02T09:12:12","date_gmt":"2021-07-02T13:12:12","guid":{"rendered":"https:\/\/www.getmaple.ca\/blog\/2021\/07\/02\/reactions-allergiques-au-vaccin-contre-la-covid-19\/"},"modified":"2025-10-29T15:06:37","modified_gmt":"2025-10-29T19:06:37","slug":"reactions-allergiques-au-vaccin-contre-la-covid-19","status":"publish","type":"post","link":"https:\/\/www.getmaple.ca\/fr\/blog\/reactions-allergiques-au-vaccin-contre-la-covid-19\/","title":{"rendered":"R\u00e9actions allergiques au vaccin contre la COVID-19"},"content":{"rendered":"<p>La distribution des vaccins contre la COVID-19 au pays nous rapproche du moment o\u00f9 le virus ne sera qu\u2019un mauvais souvenir. Quelques personnes vaccin\u00e9es ont signal\u00e9 des r\u00e9actions allergiques. M\u00eame si les allergies aux vaccins sont peu fr\u00e9quentes, elles ne sont pas impossibles pour autant. Voici quelques renseignements pour en savoir plus sur les vaccins, les allergies et ce qu\u2019il faut prendre en compte avant de se faire vacciner contre la COVID-19.<\/p>\n<h3>Que contiennent les vaccins?<\/h3>\n<p>Les vaccins stimulent le syst\u00e8me immunitaire pour combattre une maladie pr\u00e9cise. Ils contiennent un \u00e9chantillon mort ou affaibli de l\u2019agent pathog\u00e8ne. D\u2019autres ingr\u00e9dients sont aussi fr\u00e9quemment utilis\u00e9s. Leur but est de garder le vaccin stable pendant l\u2019entreposage, de pr\u00e9venir la contamination et d\u2019augmenter sa puissance. Parmi les autres ingr\u00e9dients courants, on trouve\u00a0:<\/p>\n<ul>\n<li>des acides amin\u00e9s;<\/li>\n<li>des sucres;<\/li>\n<li>des prot\u00e9ines;<\/li>\n<li>du sel;<\/li>\n<li>des traces d\u2019ingr\u00e9dients utilis\u00e9s pour \u00e9viter la croissance bact\u00e9rienne, comme le formald\u00e9hyde.<\/li>\n<\/ul>\n<p>Le site Web de la Food and Drug Administration des \u00c9tats-Unis pr\u00e9sente la <a href=\"http:\/\/www.fda.gov\/BiologicsBloodVaccines\/Vaccines\/ApprovedProducts\/ucm093833.htm\">liste compl\u00e8te<\/a> des ingr\u00e9dients de chaque vaccin.<\/p>\n<h3>Agents de conservation<\/h3>\n<p>Parfois, un flacon renferme plusieurs doses de vaccin. Les agents de conservations pr\u00e9viennent la contamination des doses inutilis\u00e9es d\u2019un flacon ouvert par des champignons ou des bact\u00e9ries, ce qui pr\u00e9vient les infections graves.<\/p>\n<h3>Adjuvants<\/h3>\n<p>Les anticorps sont des prot\u00e9ines qui combattent les maladies. Le corps en cr\u00e9e quand il est expos\u00e9 \u00e0 une nouvelle maladie, lors de la vaccination, par exemple. Plus le corps produit d\u2019anticorps, plus la r\u00e9ponse immunitaire est forte. La vaccination stimule le syst\u00e8me immunitaire afin de produire une r\u00e9ponse forte pour combattre la maladie.<\/p>\n<p>Lorsque le syst\u00e8me immunitaire produit des anticorps pour combattre une maladie, les cellules B et T s\u2019activent. Les cellules B proviennent de la moelle osseuse et les T, d\u2019une glande appel\u00e9e thymus. Les cellules B combattent les maladies qui vivent \u00e0 l\u2019ext\u00e9rieur des cellules du corps, alors que les cellules T s\u2019attaquent \u00e0 celles qui se d\u00e9veloppent \u00e0 l\u2019int\u00e9rieur de celles-ci.\u00a0 Les adjuvants sont des substances qui renforcent la r\u00e9ponse immunitaire du corps en gardant les cellules B et T actives plus longtemps. Le syst\u00e8me immunitaire peut alors cr\u00e9er plus d\u2019anticorps, ce qui augmente l\u2019efficacit\u00e9 de la r\u00e9ponse immunitaire.<\/p>\n<p>Les sels d\u2019aluminium, par exemple, sont des adjuvants couramment utilis\u00e9s dans les vaccins autoris\u00e9s au Canada. C\u2019est Sant\u00e9 Canada qui approuve la <a href=\"https:\/\/www.canada.ca\/fr\/sante-publique\/services\/publications\/vie-saine\/guide-canadien-immunisation-partie-1-information-cle-immunisation\/page-15-contenu-agents-immunisants-utilises-canada.html\">liste<\/a> des ingr\u00e9dients permis.<\/p>\n<h3>Vaccins et r\u00e9actions allergiques<\/h3>\n<p>Quoique rares, des r\u00e9actions allergiques peuvent survenir \u00e0 la suite de la vaccination.<\/p>\n<p>Certaines personnes confondent toutefois les effets secondaires courants avec une r\u00e9action allergique. Ce n\u2019est pas tout \u00e0 fait la m\u00eame chose. Les effets secondaires se manifestent g\u00e9n\u00e9ralement 12\u00a0heures apr\u00e8s l\u2019injection et peuvent durer jusqu\u2019\u00e0 36\u00a0heures. Ils peuvent comprendre les sympt\u00f4mes suivants\u00a0:<\/p>\n<ul>\n<li>l\u00e9g\u00e8re fi\u00e8vre;<\/li>\n<li>douleur \u00e0 proximit\u00e9 de la zone d\u2019injection;<\/li>\n<li>rougeur, douleur, gonflement ou d\u00e9mangeaison de la peau \u00e0 proximit\u00e9 de la zone d\u2019injection;<\/li>\n<li>douleurs musculaires;<\/li>\n<li>perte d\u2019app\u00e9tit;<\/li>\n<li>frissons;<\/li>\n<li>fatigue;<\/li>\n<li>douleurs articulaires;<\/li>\n<li>maux de t\u00eate.<\/li>\n<\/ul>\n<p>Dans certains cas, il y a des r\u00e9actions plus graves\u00a0:<\/p>\n<ul>\n<li>forte fi\u00e8vre, sup\u00e9rieure \u00e0 40\u00a0\u00b0C;<\/li>\n<li>crise d\u2019\u00e9pilepsie;<\/li>\n<li>\u00e9vanouissement.<\/li>\n<\/ul>\n<h3>Anaphylaxie<\/h3>\n<p>L\u2019anaphylaxie est une r\u00e9action allergique potentiellement mortelle. Heureusement, elle est r\u00e9versible avec l\u2019utilisation rapide d\u2019un auto-injecteur d\u2019adr\u00e9naline (EpiPen). La <a href=\"https:\/\/immunizebc.ca\/side-effects\">probabilit\u00e9<\/a> de choc anaphylactique caus\u00e9 par un vaccin varie d\u2019une sur 100\u00a0000 \u00e0 une sur un million. Bien qu\u2019extr\u00eamement rare, il faut consulter imm\u00e9diatement un m\u00e9decin si vous remarquez l\u2019un des sympt\u00f4mes suivants apr\u00e8s avoir re\u00e7u le vaccin\u00a0:<\/p>\n<ul>\n<li>gonflement du visage;<\/li>\n<li>chute sur le sol;<\/li>\n<li>baisse soudaine de la pression sanguine;<\/li>\n<li>douleur abdominale;<\/li>\n<li>difficult\u00e9 \u00e0 respirer;<\/li>\n<li>\u00e9ruption cutan\u00e9e avec d\u00e9mangeaisons;<\/li>\n<li>\u00e9ternuement, toux ou vomissement.<\/li>\n<\/ul>\n<h3>Que contient le vaccin contre la COVID-19?<\/h3>\n<p>En ce moment, il y a <a href=\"https:\/\/www.canada.ca\/fr\/sante-canada\/services\/medicaments-produits-sante\/covid19-industrie\/medicaments-vaccins-traitements\/vaccins.html\">quatre vaccins contre la COVID-19<\/a> approuv\u00e9s au Canada\u00a0: Pfizer-BioNtech, Moderna, AstraZeneca et Janssen. La plupart des personnes qui ont signal\u00e9 des r\u00e9actions allergiques au Canada jusqu\u2019\u00e0 pr\u00e9sent ont re\u00e7u le vaccin Pfizer.<\/p>\n<p>Ce vaccin contient les <a href=\"https:\/\/canadiensensante.gc.ca\/recall-alert-rappel-avis\/hc-sc\/2020\/74543a-fra.php\">ingr\u00e9dients<\/a> suivants\u00a0:<\/p>\n<ul>\n<li>Ingr\u00e9dient m\u00e9dicinal\u00a0:\n<ul>\n<li>ARNm<\/li>\n<\/ul>\n<\/li>\n<li>Ingr\u00e9dients non m\u00e9dicinaux\u00a0:\n<ul>\n<li>ALC-0315 = bis(2-hexyld\u00e9canoate) de ((4-hydroxybutyl)azanediyl)bis(hexane-6,1-diyle);<\/li>\n<li>ALC-0159 = 2-[(poly\u00e9thyl\u00e8neglycol)-2000]-N,Ndit\u00e9trad\u00e9cylac\u00e9tamide;<\/li>\n<li>1,2- dist\u00e9aroyl-sn-glyc\u00e9ro-3-phosphocholine;<\/li>\n<li>cholest\u00e9rol;<\/li>\n<li>phosphate dibasique de sodium dihydrat\u00e9;<\/li>\n<li>phosphate monobasique de potassium;<\/li>\n<li>chlorure de potassium;<\/li>\n<li>chlorure de sodium;<\/li>\n<li>saccharose;<\/li>\n<li>eau pour injection.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>Chaque vaccin passe par des essais cliniques avant sa commercialisation. Les responsables de la sant\u00e9 publique examinent les d\u00e9tails concernant les r\u00e9actions courantes au vaccin avant de l\u2019approuver. Dans le cas du vaccin Pfizer, les essais cliniques ont aussi r\u00e9v\u00e9l\u00e9 des sympt\u00f4mes de r\u00e9action allergique. C\u2019est une bonne nouvelle, car cela signifie qu\u2019il n\u2019y a pas de r\u00e9actions inhabituelles \u00e0 ce vaccin jusqu\u2019\u00e0 pr\u00e9sent. C\u2019est \u00e9galement la raison pour laquelle le vaccin est toujours jug\u00e9 <a href=\"https:\/\/www.cbc.ca\/news\/politics\/adverse-events-covid-19-vaccines-1.5866357\">s\u00e9curitaire<\/a>. Les experts affirment que les risques de r\u00e9action allergique ne sont pas aussi graves que les risques li\u00e9s \u00e0 l\u2019absence de vaccination.<\/p>\n<h3>Que faire si vous avez peur d\u2019\u00eatre allergique?<\/h3>\n<p>C\u2019est normal de s\u2019inqui\u00e9ter de l\u2019innocuit\u00e9 d\u2019un nouveau m\u00e9dicament. Si vous avez eu une r\u00e9action allergique \u00e0 votre premi\u00e8re dose de vaccin contre la COVID-19, consultez un m\u00e9decin avant de recevoir votre deuxi\u00e8me dose. Une exposition r\u00e9p\u00e9t\u00e9e \u00e0 l\u2019allerg\u00e8ne peut accentuer les r\u00e9actions allergiques. Par cons\u00e9quent, la r\u00e9action \u00e0 la deuxi\u00e8me injection peut \u00eatre plus forte qu\u2019\u00e0 la premi\u00e8re. Un allergologue vous expliquera les risques d\u2019une r\u00e9action allergique accrue.<\/p>\n<p>Avez-vous d\u00e9j\u00e0 eu une mauvaise r\u00e9action \u00e0 un vaccin? Si vous avez des ant\u00e9c\u00e9dents d\u2019allergies aux m\u00e9dicaments, un allergologue vous indiquera si l\u2019un des vaccins vous convient. Si vous n\u2019avez jamais eu de r\u00e9action, rien ne permet de penser que vous \u00eates \u00e0 risque d\u2019en pr\u00e9senter une lorsque vous vous ferez vacciner contre la COVID-19.<\/p>\n<p>Voici quelques \u00e9l\u00e9ments \u00e0 prendre en compte afin de prendre une d\u00e9cision \u00e9clair\u00e9e.<\/p>\n<ul>\n<li>Lecture de la liste des <a href=\"https:\/\/canadiensensante.gc.ca\/recall-alert-rappel-avis\/hc-sc\/2020\/74543a-fra.php\">ingr\u00e9dients<\/a> des vaccins contre la COVID-19;<\/li>\n<li>Consultation avec un allergologue pour \u00e9valuer les risques de r\u00e9action allergique en fonction de vos ant\u00e9c\u00e9dents m\u00e9dicaux;<\/li>\n<li>\u00c9tat de sant\u00e9 actuel. Une personne immunosupprim\u00e9e ou <a href=\"https:\/\/bronx.news12.com\/world-health-organization-moderna-vaccine-not-recommended-for-pregnant-women\">enceinte<\/a> n\u2019est peut-\u00eatre pas admissible \u00e0 la vaccination. En cas de doute, consultez un professionnel de la sant\u00e9;<\/li>\n<li>Ant\u00e9c\u00e9dents de r\u00e9actions allergiques graves aux vaccins. Si vous avez d\u00e9j\u00e0 souffert d\u2019anaphylaxie apr\u00e8s avoir re\u00e7u un vaccin, consultez un m\u00e9decin pour d\u00e9terminer la cause de la r\u00e9action;<\/li>\n<li>Ant\u00e9c\u00e9dents de r\u00e9actions allergiques graves \u00e0 certains aliments, \u00e0 des insectes ou \u00e0 d\u2019autres m\u00e9dicaments.<\/li>\n<\/ul>\n<h3>Gardez votre tranquillit\u00e9 d\u2019esprit<\/h3>\n<p>Malgr\u00e9 les quelques r\u00e9actions allergiques aux vaccins contre la COVID-19, il n\u2019y a pas lieu de paniquer. Les m\u00eames r\u00e9actions ont \u00e9t\u00e9 observ\u00e9es pendant les essais cliniques, ce qui signifie qu\u2019il n\u2019y a pas eu de surprise. C\u2019est une bonne nouvelle. Cela montre que jusqu\u2019\u00e0 pr\u00e9sent, le vaccin fonctionne comme les scientifiques l\u2019avaient pr\u00e9vu.<\/p>\n<p>N\u2019h\u00e9sitez pas \u00e0 consulter un allergologue \u00e0 propos de la vaccination contre la COVID-19 pour garder votre tranquillit\u00e9 d\u2019esprit. Ils peuvent vous expliquer les options pour une vaccination s\u00e9curitaire.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>M\u00eame si les allergies aux vaccins contre la COVID-19 sont peu fr\u00e9quentes, elles ne sont pas impossibles pour autant.<\/p>\n","protected":false},"author":19,"featured_media":18669,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false},"categories":[7386],"tags":[],"acf":{"add_call_to_action":false,"call_to_action_button_text":"S'inscrire","call_to_action_link":"[mpl-register-link]","call_to_action_text":"Consultez un m\u00e9decin en ligne","image":{"ID":18669,"id":18669,"title":"Allergic-Reactions-from-COVID-Vaccine_022021","filename":"Allergic-Reactions-from-COVID-Vaccine_022021.jpg","filesize":394556,"url":"https:\/\/www.getmaple.ca\/wp-content\/uploads\/2021\/03\/Allergic-Reactions-from-COVID-Vaccine_022021.jpg","link":"https:\/\/www.getmaple.ca\/fr\/blog\/reactions-allergiques-au-vaccin-contre-la-covid-19\/allergic-reactions-from-covid-vaccine_022021-2\/","alt":"Older man using a blood pressure cuff.","author":"19","description":"","caption":"","name":"allergic-reactions-from-covid-vaccine_022021-2","status":"inherit","uploaded_to":22150,"date":"2021-03-12 14:24:13","modified":"2021-07-02 13:12:13","menu_order":0,"mime_type":"image\/jpeg","type":"image","subtype":"jpeg","icon":"https:\/\/www.getmaple.ca\/wp-includes\/images\/media\/default.png","width":2880,"height":1180,"sizes":{"thumbnail":"https:\/\/www.getmaple.ca\/wp-content\/uploads\/2021\/03\/Allergic-Reactions-from-COVID-Vaccine_022021-150x150.jpg","thumbnail-width":150,"thumbnail-height":150,"medium":"https:\/\/www.getmaple.ca\/wp-content\/uploads\/2021\/03\/Allergic-Reactions-from-COVID-Vaccine_022021-300x123.jpg","medium-width":300,"medium-height":123,"medium_large":"https:\/\/www.getmaple.ca\/wp-content\/uploads\/2021\/03\/Allergic-Reactions-from-COVID-Vaccine_022021-768x315.jpg","medium_large-width":768,"medium_large-height":315,"large":"https:\/\/www.getmaple.ca\/wp-content\/uploads\/2021\/03\/Allergic-Reactions-from-COVID-Vaccine_022021-1024x420.jpg","large-width":1024,"large-height":420,"1536x1536":"https:\/\/www.getmaple.ca\/wp-content\/uploads\/2021\/03\/Allergic-Reactions-from-COVID-Vaccine_022021.jpg","1536x1536-width":1536,"1536x1536-height":629,"2048x2048":"https:\/\/www.getmaple.ca\/wp-content\/uploads\/2021\/03\/Allergic-Reactions-from-COVID-Vaccine_022021.jpg","2048x2048-width":2048,"2048x2048-height":839,"square1200":"https:\/\/www.getmaple.ca\/wp-content\/uploads\/2021\/03\/Allergic-Reactions-from-COVID-Vaccine_022021-1200x1180.jpg","square1200-width":1200,"square1200-height":1180,"square600":"https:\/\/www.getmaple.ca\/wp-content\/uploads\/2021\/03\/Allergic-Reactions-from-COVID-Vaccine_022021-600x600.jpg","square600-width":600,"square600-height":600,"square300":"https:\/\/www.getmaple.ca\/wp-content\/uploads\/2021\/03\/Allergic-Reactions-from-COVID-Vaccine_022021-300x300.jpg","square300-width":300,"square300-height":300,"square200":"https:\/\/www.getmaple.ca\/wp-content\/uploads\/2021\/03\/Allergic-Reactions-from-COVID-Vaccine_022021-200x200.jpg","square200-width":200,"square200-height":200,"square100":"https:\/\/www.getmaple.ca\/wp-content\/uploads\/2021\/03\/Allergic-Reactions-from-COVID-Vaccine_022021-100x100.jpg","square100-width":100,"square100-height":100,"feature1200":"https:\/\/www.getmaple.ca\/wp-content\/uploads\/2021\/03\/Allergic-Reactions-from-COVID-Vaccine_022021-1200x600.jpg","feature1200-width":1200,"feature1200-height":600,"feature1100":"https:\/\/www.getmaple.ca\/wp-content\/uploads\/2021\/03\/Allergic-Reactions-from-COVID-Vaccine_022021-1100x500.jpg","feature1100-width":1100,"feature1100-height":500,"feature800":"https:\/\/www.getmaple.ca\/wp-content\/uploads\/2021\/03\/Allergic-Reactions-from-COVID-Vaccine_022021-800x400.jpg","feature800-width":800,"feature800-height":400,"feature400":"https:\/\/www.getmaple.ca\/wp-content\/uploads\/2021\/03\/Allergic-Reactions-from-COVID-Vaccine_022021-400x200.jpg","feature400-width":400,"feature400-height":200,"facebook1200":"https:\/\/www.getmaple.ca\/wp-content\/uploads\/2021\/03\/Allergic-Reactions-from-COVID-Vaccine_022021-1200x630.jpg","facebook1200-width":1200,"facebook1200-height":630,"medium_retina":"https:\/\/www.getmaple.ca\/wp-content\/uploads\/2021\/03\/Allergic-Reactions-from-COVID-Vaccine_022021-1200x492.jpg","medium_retina-width":1200,"medium_retina-height":492,"large_retina":"https:\/\/www.getmaple.ca\/wp-content\/uploads\/2021\/03\/Allergic-Reactions-from-COVID-Vaccine_022021-2360x967.jpg","large_retina-width":2360,"large_retina-height":967}},"show_age_gate":false,"intro_text":"","meta_title":"","meta_description":"","add_promotional_banner":false,"reviewer":false,"author":false},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v18.4 (Yoast SEO v18.9) - 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