{"id":132772,"date":"2022-03-03T23:43:38","date_gmt":"2022-03-03T18:13:38","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=132772"},"modified":"2025-06-18T16:28:13","modified_gmt":"2025-06-18T10:58:13","slug":"introduction-to-infectious-agents","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/class-9\/evs\/why-do-we-fall-ill\/introduction-to-infectious-agents\/","title":{"rendered":"Introduction to Infectious Agents"},"content":{"rendered":"<p><strong>Table of Contents<\/strong><\/p>\n<ul>\n<li>Classification of Infectious Agents<\/li>\n<\/ul>\n<p>&#8211; Advantages of Classifying Infectious Agents<\/p>\n<ul>\n<li>Summary<\/li>\n<li>What\u2019s Next?<\/li>\n<\/ul>\n<p>In the previous segment of \u2018Why do we fall ill\u2019 we learnt about the <strong>Types of diseases<\/strong>. In this segment, let us move forward and understand the Infectious agents.<\/p>\n<h2>How are infectious agents classified?<\/h2>\n<p>Based on the common characteristics shared, microorganisms are classified into major groups. They are:<\/p>\n<ol>\n<li>Viruses<\/li>\n<li>Bacteria<\/li>\n<li>Fungi<\/li>\n<li>Single-celled animals or Protozoans<\/li>\n<li>Multicellular helminths<\/li>\n<\/ol>\n<p>Let us now look at an example of diseases caused by the respective groups of microbes.<\/p>\n<table>\n<tbody>\n<tr>\n<td><strong>Sr. No<\/strong><\/td>\n<td><strong>Group of Microbes<\/strong><\/td>\n<td><strong>Disease caused<\/strong><\/td>\n<\/tr>\n<tr>\n<td>1.<\/td>\n<td>Virus<\/td>\n<td>Common cold<\/td>\n<\/tr>\n<tr>\n<td>2.<\/td>\n<td>Bacteria<\/td>\n<td>Diarrhoea<\/td>\n<\/tr>\n<tr>\n<td>3.<\/td>\n<td>Fungi<\/td>\n<td>Skin rashes<\/td>\n<\/tr>\n<tr>\n<td>4.<\/td>\n<td>Single-celled animals or Protozoans<\/td>\n<td>Malaria<\/td>\n<\/tr>\n<tr>\n<td>5.<\/td>\n<td>Multicellular helminths<\/td>\n<td>Intestinal infections<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>What are the advantages of classifying infectious agents?<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Table of Contents Classification of Infectious Agents &#8211; Advantages of Classifying Infectious Agents Summary What\u2019s Next? In the previous segment [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"Introduction to Infectious Agents","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"Introduction to Infectious Agents | Class 9 EVS Why do we fall ill","custom_permalink":"class-9\/evs\/why-do-we-fall-ill\/introduction-to-infectious-agents\/"},"categories":[53,55],"tags":[],"table_tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Introduction to Infectious Agents - Infinity Learn by Sri Chaitanya<\/title>\n<meta name=\"description\" content=\"Introduction to Infectious Agents | Class 9 EVS Why do we fall ill\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/infinitylearn.com\/surge\/class-9\/evs\/why-do-we-fall-ill\/introduction-to-infectious-agents\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Introduction to Infectious Agents - 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