{"id":144624,"date":"2022-01-07T07:41:18","date_gmt":"2022-01-07T11:41:18","guid":{"rendered":"https:\/\/antiguanewsroom.com\/?p=144624"},"modified":"2022-01-07T07:41:18","modified_gmt":"2022-01-07T11:41:18","slug":"womens-periods-may-be-slightly-late-after-covid-vaccine-study","status":"publish","type":"post","link":"https:\/\/antiguanewsroom.com\/womens-periods-may-be-slightly-late-after-covid-vaccine-study\/","title":{"rendered":"Women\u2019s periods may be slightly late after COVID vaccine: study"},"content":{"rendered":"<div id=\"antig-439079532\" class=\"antig-ecab antig-entity-placement\"><a href=\"https:\/\/discoverflow.co\/web\/antigua\" aria-label=\"ANU CVP Digital Broadband 1200x400_1\"><img src=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1201\/h:401\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg\" alt=\"\"  srcset=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1201\/h:401\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg 1201w, https:\/\/mlavawteztbj.i.optimole.com\/w:300\/h:100\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg 300w, https:\/\/mlavawteztbj.i.optimole.com\/w:1024\/h:342\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg 1024w, https:\/\/mlavawteztbj.i.optimole.com\/w:768\/h:256\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg 768w\" sizes=\"(max-width: 696px) 100vw, 696px\" width=\"1201\" height=\"401\"   \/><\/a><\/div><div id=\"antig-2999146455\" class=\"antig-before-content antig-entity-placement\"><a href=\"https:\/\/www.facebook.com\/medicalbenefitsscheme\" aria-label=\"ce741a73-c70c-446b-af7f-da2abe2b62bb\"><img src=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1200\/h:400\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2024\/12\/ce741a73-c70c-446b-af7f-da2abe2b62bb.jpeg\" alt=\"\"  srcset=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1200\/h:400\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2024\/12\/ce741a73-c70c-446b-af7f-da2abe2b62bb.jpeg 1200w, https:\/\/mlavawteztbj.i.optimole.com\/w:300\/h:100\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2024\/12\/ce741a73-c70c-446b-af7f-da2abe2b62bb.jpeg 300w, https:\/\/mlavawteztbj.i.optimole.com\/w:1024\/h:341\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2024\/12\/ce741a73-c70c-446b-af7f-da2abe2b62bb.jpeg 1024w, https:\/\/mlavawteztbj.i.optimole.com\/w:768\/h:256\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2024\/12\/ce741a73-c70c-446b-af7f-da2abe2b62bb.jpeg 768w\" sizes=\"(max-width: 696px) 100vw, 696px\" width=\"1200\" height=\"400\"   \/><\/a><\/div><p>WASHINGTON, United States\u00a0(AFP)\u2014 Women vaccinated against COVID-19 saw a slight delay in their period of almost a day compared to those who were unvaccinated, a US government-funded study said Thursday.<\/p><div id=\"antig-2376177694\" class=\"antig-content_5 antig-entity-placement\"><a href=\"https:\/\/www.facebook.com\/ablpag\" aria-label=\"Full-ABLP-Team-Digital-Billboard-1920x1080px\"><img src=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1920\/h:1080\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2023\/01\/Full-ABLP-Team-Digital-Billboard-1920x1080px.jpg\" alt=\"\"  srcset=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1920\/h:1080\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2023\/01\/Full-ABLP-Team-Digital-Billboard-1920x1080px.jpg 1920w, https:\/\/mlavawteztbj.i.optimole.com\/w:300\/h:169\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2023\/01\/Full-ABLP-Team-Digital-Billboard-1920x1080px.jpg 300w, https:\/\/mlavawteztbj.i.optimole.com\/w:1024\/h:576\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2023\/01\/Full-ABLP-Team-Digital-Billboard-1920x1080px.jpg 1024w, https:\/\/mlavawteztbj.i.optimole.com\/w:768\/h:432\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2023\/01\/Full-ABLP-Team-Digital-Billboard-1920x1080px.jpg 768w, https:\/\/mlavawteztbj.i.optimole.com\/w:1536\/h:864\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2023\/01\/Full-ABLP-Team-Digital-Billboard-1920x1080px.jpg 1536w\" sizes=\"(max-width: 696px) 100vw, 696px\" width=\"1920\" height=\"1080\"   \/><\/a><\/div>\n<p>But the number of days of bleeding was not affected, according to the research carried out on nearly 4,000 individuals and published in \u201cObstetrics &amp; Gynecology.\u201d<\/p>\n<div id=\"antig-498717230\" class=\"antig-inside-article-content\"><\/div>\n<p>Lead author Alison Edelman of the Oregon Health &amp; Science University told AFP the effects are small and expected to be temporary, a finding that is \u201cvery reassuring\u201d as well as validating for those who experienced changes.<\/p><div id=\"antig-4209398221\" class=\"antig-content_4 antig-entity-placement\"><a href=\"https:\/\/discoverflow.co\/web\/antigua\" aria-label=\"ANU CVP Digital Broadband 1200x400_1\"><img src=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1201\/h:401\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg\" alt=\"\"  srcset=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1201\/h:401\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg 1201w, https:\/\/mlavawteztbj.i.optimole.com\/w:300\/h:100\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg 300w, https:\/\/mlavawteztbj.i.optimole.com\/w:1024\/h:342\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg 1024w, https:\/\/mlavawteztbj.i.optimole.com\/w:768\/h:256\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg 768w\" sizes=\"(max-width: 696px) 100vw, 696px\" width=\"1201\" height=\"401\"   \/><\/a><\/div><div id=\"antig-769296050\" class=\"antig-content_12 antig-entity-placement\"><a href=\"https:\/\/www.facebook.com\/ablpag\" aria-label=\"Full-ABLP-Team-Digital-Billboard-1920x1080px\"><img src=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1920\/h:1080\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2023\/01\/Full-ABLP-Team-Digital-Billboard-1920x1080px.jpg\" alt=\"\"  srcset=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1920\/h:1080\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2023\/01\/Full-ABLP-Team-Digital-Billboard-1920x1080px.jpg 1920w, https:\/\/mlavawteztbj.i.optimole.com\/w:300\/h:169\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2023\/01\/Full-ABLP-Team-Digital-Billboard-1920x1080px.jpg 300w, https:\/\/mlavawteztbj.i.optimole.com\/w:1024\/h:576\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2023\/01\/Full-ABLP-Team-Digital-Billboard-1920x1080px.jpg 1024w, https:\/\/mlavawteztbj.i.optimole.com\/w:768\/h:432\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2023\/01\/Full-ABLP-Team-Digital-Billboard-1920x1080px.jpg 768w, https:\/\/mlavawteztbj.i.optimole.com\/w:1536\/h:864\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2023\/01\/Full-ABLP-Team-Digital-Billboard-1920x1080px.jpg 1536w\" sizes=\"(max-width: 696px) 100vw, 696px\" width=\"1920\" height=\"1080\"   \/><\/a><\/div>\n<p>The study can also help counter anti-vaccine misinformation on the topic, which is rampant on social media.<\/p><div id=\"antig-884839733\" class=\"antig-content antig-entity-placement\"><a href=\"https:\/\/www.facebook.com\/ReggaeInTheParkAntigua\" aria-label=\"lucanio\"><img src=\"https:\/\/mlavawteztbj.i.optimole.com\/w:864\/h:1080\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2020\/12\/lucanio.jpeg\" alt=\"\"  srcset=\"https:\/\/mlavawteztbj.i.optimole.com\/w:864\/h:1080\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2020\/12\/lucanio.jpeg 1080w, https:\/\/mlavawteztbj.i.optimole.com\/w:240\/h:300\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2020\/12\/lucanio.jpeg 240w, https:\/\/mlavawteztbj.i.optimole.com\/w:819\/h:1024\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2020\/12\/lucanio.jpeg 819w, https:\/\/mlavawteztbj.i.optimole.com\/w:768\/h:960\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2020\/12\/lucanio.jpeg 768w\" sizes=\"(max-width: 696px) 100vw, 696px\" width=\"1080\" height=\"1350\"   \/><\/a><\/div>\n<div id=\"antig-1617494175\" class=\"antig-before-youtube-ads socialMedia\"><\/div>\n<p>The slight increase in menstrual cycle length is not clinically significant. Any change of fewer than eight days is classified as normal by the International Federation of Gynecology and Obstetrics.<\/p>\n<p>Period cycles generally last about 28 days, but the precise amount varies from one woman to another, as well as within an individual\u2019s lifetime. It can also change during times of stress.<\/p><div id=\"antig-886327315\" class=\"antig-content_2 antig-entity-placement\"><a href=\"https:\/\/www.courts.com\/antigua\/\" aria-label=\"500X500 (1)\"><img src=\"https:\/\/mlavawteztbj.i.optimole.com\/w:500\/h:500\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2026\/03\/500X500-1.jpg\" alt=\"\"  srcset=\"https:\/\/mlavawteztbj.i.optimole.com\/w:500\/h:500\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2026\/03\/500X500-1.jpg 500w, https:\/\/mlavawteztbj.i.optimole.com\/w:300\/h:300\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2026\/03\/500X500-1.jpg 300w, https:\/\/mlavawteztbj.i.optimole.com\/w:150\/h:150\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2026\/03\/500X500-1.jpg 150w\" sizes=\"(max-width: 500px) 100vw, 500px\" width=\"500\" height=\"500\"   \/><\/a><\/div>\n<div id=\"antig-625117027\" class=\"antig-content_2\"><\/div>\n<p>For their study, the scientists analysed anonymised data from a fertility tracking app, among women aged 18 to 45 who were not using hormonal contraception.<\/p>\n<p>Some 2,400 participants were vaccinated \u2014 the majority with Pfizer (55 per cent), followed by Moderna (35 per cent) and Johnson &amp; Johnson (seven per cent).<\/p><div id=\"antig-569393236\" class=\"antig-content_3 antig-entity-placement\"><a href=\"https:\/\/chtamarketplace.com\/\" aria-label=\"Social FaceBook Cover Desk_Mobile\"><img src=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1920\/h:711\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2026\/04\/Social-FaceBook-Cover-Desk_Mobile-scaled.jpg\" alt=\"\"  srcset=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1920\/h:711\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2026\/04\/Social-FaceBook-Cover-Desk_Mobile-scaled.jpg 2560w, https:\/\/mlavawteztbj.i.optimole.com\/w:300\/h:111\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2026\/04\/Social-FaceBook-Cover-Desk_Mobile-scaled.jpg 300w, https:\/\/mlavawteztbj.i.optimole.com\/w:1024\/h:379\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2026\/04\/Social-FaceBook-Cover-Desk_Mobile-scaled.jpg 1024w, https:\/\/mlavawteztbj.i.optimole.com\/w:768\/h:285\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2026\/04\/Social-FaceBook-Cover-Desk_Mobile-scaled.jpg 768w, https:\/\/mlavawteztbj.i.optimole.com\/w:1536\/h:569\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2026\/04\/Social-FaceBook-Cover-Desk_Mobile-scaled.jpg 1536w, https:\/\/mlavawteztbj.i.optimole.com\/w:1920\/h:711\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2026\/04\/Social-FaceBook-Cover-Desk_Mobile-scaled.jpg 2048w\" sizes=\"(max-width: 696px) 100vw, 696px\" width=\"2560\" height=\"949\"   \/><\/a><\/div>\n<p>About 1,500 unvaccinated women were also included as a comparison.<\/p><div id=\"antig-4235808250\" class=\"antig-content_6 antig-entity-placement\"><a href=\"https:\/\/discoverflow.co\/web\/antigua\" aria-label=\"ANU CVP Digital Broadband 1200x400_1\"><img src=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1201\/h:401\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg\" alt=\"\"  srcset=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1201\/h:401\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg 1201w, https:\/\/mlavawteztbj.i.optimole.com\/w:300\/h:100\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg 300w, https:\/\/mlavawteztbj.i.optimole.com\/w:1024\/h:342\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg 1024w, https:\/\/mlavawteztbj.i.optimole.com\/w:768\/h:256\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2025\/11\/ANU-CVP-Digital-Broadband-1200x400_1-1.jpg 768w\" sizes=\"(max-width: 696px) 100vw, 696px\" width=\"1201\" height=\"401\"   \/><\/a><\/div>\n<p>Among the vaccinated group, data was collected from three consecutive cycles before vaccination and from three more consecutive cycles, including the cycle or cycles in which vaccination took place.<\/p>\n<p>For unvaccinated individuals, data was collected for six consecutive cycles.<\/p>\n<p><strong>\u2013 Immune response to vaccine \u2013<\/strong><\/p>\n<p>On average, the first vaccine dose was associated with a 0.64-day increase in cycle length and the second dose with a 0.79-day increase, when comparing the vaccinated to unvaccinated group.<\/p>\n<p>The immune system\u2019s response to the vaccine could be behind the change.<\/p>\n<p>\u201cWe know that the immune system and the reproductive system are interlinked,\u201d said Edelman.<\/p>\n<p>A revved-up immune system might have an impact on the hypothalamic-pituitary-ovarian axis \u2014 what Edelman calls the \u201chighway of how your brain talks to your ovaries, talks to your uterus,\u201d or simply the \u201cbody clock.\u201d<\/p>\n<p>Specifically, the production of inflammatory proteins called cytokines appears to disrupt the way this axis regulates the timing of menstrual cycles.<\/p>\n<p>The changes seem most pronounced when vaccination takes place early in the follicular phase, which starts on the first day of the menstrual period (bleeding) and ends when ovulation begins.<\/p>\n<p>In fact, a subgroup of people who received two injections of the Pfizer or Moderna vaccines during the same cycle, as opposed to two different cycles, saw an average increase in cycle length of two days \u2014 but the effect again appears temporary.<\/p>\n<p>The team now hopes to gather more data on subsequent cycles among vaccinated women to confirm a long-term return to baseline, and expand the study globally so they can differentiate the effects between vaccine brands.<\/p>\n<div id=\"antig-3205380998\" class=\"antig-in-comments_2 antig-entity-placement\"><a href=\"https:\/\/www.facebook.com\/@hadeedmotorsltd\" aria-label=\"Hadeed_WEB_Banner_MG-2\"><img src=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1000\/h:250\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2024\/12\/Hadeed_WEB_Banner_MG-2.png\" alt=\"\"  srcset=\"https:\/\/mlavawteztbj.i.optimole.com\/w:1000\/h:250\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2024\/12\/Hadeed_WEB_Banner_MG-2.png 1000w, https:\/\/mlavawteztbj.i.optimole.com\/w:300\/h:75\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2024\/12\/Hadeed_WEB_Banner_MG-2.png 300w, https:\/\/mlavawteztbj.i.optimole.com\/w:768\/h:192\/q:mauto\/f:best\/https:\/\/antiguanewsroom.com\/wp-content\/uploads\/2024\/12\/Hadeed_WEB_Banner_MG-2.png 768w\" sizes=\"(max-width: 696px) 100vw, 696px\" width=\"1000\" height=\"250\"   \/><\/a><\/div>","protected":false},"excerpt":{"rendered":"<p>WASHINGTON, United States\u00a0(AFP)\u2014 Women vaccinated against COVID-19 saw a slight delay in their period of almost a day compared to those who were unvaccinated, a US government-funded study said Thursday. But the number of days of bleeding was not affected, according to the research carried out on nearly 4,000 individuals and published in \u201cObstetrics &amp; [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":141433,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-144624","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.1 (Yoast SEO v24.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Women\u2019s periods may be slightly late after COVID vaccine: study - Antigua News Room<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/antiguanewsroom.com\/womens-periods-may-be-slightly-late-after-covid-vaccine-study\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Women\u2019s periods may be slightly late after COVID vaccine: study\" \/>\n<meta property=\"og:description\" content=\"WASHINGTON, United States\u00a0(AFP)\u2014 Women vaccinated against COVID-19 saw a slight delay in their period of almost a day compared to those who were unvaccinated, a US government-funded study said Thursday. 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