{"id":49972,"date":"2025-04-25T21:21:21","date_gmt":"2025-04-26T01:21:21","guid":{"rendered":"https:\/\/www.hancockhealth.org\/mayo-health-library\/stomach-flu-how-long-am-i-contagious\/"},"modified":"2026-02-04T11:39:38","modified_gmt":"2026-02-04T16:39:38","slug":"stomach-flu-how-long-am-i-contagious","status":"publish","type":"mayo","link":"https:\/\/www.hancockhealth.org\/ja\/mayo-health-library\/stomach-flu-how-long-am-i-contagious\/","title":{"rendered":"Stomach flu: How long am I contagious?"},"content":{"rendered":"<div class=\"container mx-auto   wordpress-block wordpress- core-\">\n<p>You can pass stomach flu, also known as gastroenteritis, to others from a few days up to two weeks or more. The time depends on which virus is causing your illness.<\/p>\n<p>Although it&#8217;s commonly called stomach flu, gastroenteritis isn&#8217;t the same as influenza, also known as flu. The flu affects the respiratory system &mdash; the nose, throat and lungs. Gastroenteritis, on the other hand, is an infection of the intestines.<\/p>\n<p>Noroviruses, rotaviruses and other viruses can cause gastroenteritis. These viruses spread between people who are in close contact. They are spread through contact with the stool or vomit from a sick person.<\/p>\n<p>The contagious period is the time when a person can give the illness to others. This period differs slightly for each virus.<\/p>\n<ul>\n<li>\n<p><strong>Norovirus.<\/strong> Norovirus is the most common cause of viral gastroenteritis. With norovirus, you can be contagious before you feel ill. Symptoms usually appear within 1 to 2 days being exposed to the virus.<\/p>\n<p>Most people with norovirus feel better a day or two after their symptoms begin. But they&#8217;re contagious for a few days after they recover. The virus can stay in the stool for two weeks or more after recovery.<\/p>\n<p>Children should stay home from school or child care for at least two days after the last time they vomit or have diarrhea.<\/p>\n<\/li>\n<li>\n<p><strong>Rotavirus.<\/strong> Rotavirus as a cause of viral gastroenteritis is more common in infants and young children. Symptoms of rotavirus usually appear 1 to 3 days after a person is in contact with the virus and last 3 to 8 days.<\/p>\n<p>But people with rotavirus are contagious even before they develop symptoms. They&#8217;re still contagious up to two weeks after they&#8217;ve recovered.<\/p>\n<\/li>\n<\/ul>\n<p>Washing your hands often with soap and water is the best way to stop the spread of these viruses to others. Hand-washing works much better than alcohol-based hand sanitizer for norovirus.<\/p>\n<p>To help keep others from getting sick, disinfect contaminated surfaces right after someone vomits or has diarrhea. Wear gloves that you can throw out after using them, called disposable.<\/p>\n<p>Use a bleach-based household cleanser. You can make your own with 5 to 24 tablespoons (74 to 355 milliliters) of bleach in 1 gallon (3.8 liters) of water. Norovirus can survive for months on surfaces not disinfected well enough with bleach solution.<\/p>\n<p>Also wear disposable gloves to wash clothes or linens right away if they might be contaminated.<\/p>\n<p>To prevent the spread of rotavirus, infants can get a rotavirus vaccine.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Depending on which virus causes your stomach illness, you can be contagious from a few days to two weeks or more.<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","template":"","tags":[1685,1682,1684],"class_list":["post-49972","mayo","type-mayo","status-publish","hentry","tag-condition","tag-person-group-concept","tag-theme-of-focus","content_type-answers"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Stomach flu: How long am I contagious? - Hancock Health<\/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:\/\/www.hancockhealth.org\/ja\/mayo-health-library\/stomach-flu-how-long-am-i-contagious\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Stomach flu: How long am I contagious? 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