{"id":2187,"date":"2026-06-19T09:29:29","date_gmt":"2026-06-19T09:29:29","guid":{"rendered":"https:\/\/www.thesaferfoodgroup.com\/knowledge\/?p=2187"},"modified":"2026-06-19T09:41:58","modified_gmt":"2026-06-19T09:41:58","slug":"biological-hazards-in-food","status":"publish","type":"post","link":"https:\/\/www.thesaferfoodgroup.com\/knowledge\/biological-hazards-in-food\/","title":{"rendered":"Biological hazards in food"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">A key part of good food safety practice is removing, or at least minimising, the hazards that create the risk of consumer illness. To help us better understand these hazards and how to deal with them, we split them into 4 key categories:<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\">Biological (or microbiological)<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Physical<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Chemical<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Allergenic<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Of these, biological hazards are considered the biggest threat - because they carry the greatest risk of serious harm to many people, and are often the most difficult to control. Let\u2019s have a look at biological contamination of food, how it\u2019s caused and how we can prevent or minimise it.<\/span><\/p>\n<h2><b>Food poisoning<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">To understand biological hazards, we need to understand why they are such a threat. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Food poisoning occurs when pathogenic bacteria - a major biological hazard - contaminate food and are then allowed the opportunity to multiply sufficiently to overcome our natural defences and threaten our health. Symptoms of food poisoning are unpleasant and often include vomiting and diarrhoea, but recovery in most cases only takes 1-3 days. However, food poisoning can also lead to serious medical problems with life changing or even life-threatening consequences.\u00a0\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Groups at most risk from the effects of food poisoning include pregnant women, young children, the elderly and those with a chronic illness or reduced immunity. Getting rid of pathogenic bacteria from the environment completely is impossible, so preventing them from reaching food and \/ or multiplying is a key responsibility of all food handlers.<\/span><\/p>\n<h3><b>Can all foods be affected by food poisoning?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Yes, but some foods are at higher risk from pathogenic bacteria than others.<\/span><\/p>\n<p><b>High risk foods\u00a0<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Foods categorised as high-risk include raw and cooked meats, dairy, and seafood, and foods containing these as ingredients. Other high-risk food examples include gravy, sauces, stock, soup, pate and prawns. High-risk foods are high in protein and usually contain high moisture levels; conditions that pathogenic bacteria love.\u00a0<\/span><\/p>\n<p><b>Low risk foods\u00a0<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Low-risk foods are those that generally speaking can be stored at ambient temperatures (without refrigeration) such as salads and vegetables. Dried foods are generally speaking low-risk foods but can become high-risk once cooked. Rice is a good example of this.\u00a0<\/span><\/p>\n<h2><b>How bacteria multiply<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">We now know that pathogenic bacteria are a critical biological hazard. Pathogenic bacteria are dangerous microscopic bacteria; common examples of include Salmonella, E. coli, and Clostridium. They enter food through contamination and can quickly multiply to dangerous levels.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">When bacteria find themselves in the right conditions, they multiply by each cell dividing in two. Two cells become four, then four become eight (and so on). Bacteria can divide in this way once every 10-15 minutes allowing them to multiply rapidly.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Bacteria need<\/span><b> the following factors to be present <\/b><span style=\"font-weight: 400;\">to multiply:<\/span><b><br \/>\n<\/b><\/p>\n<ol>\n<li><b> Food <\/b><span style=\"font-weight: 400;\">- Like us, bacteria need food, and especially protein, to survive and multiply. They thrive in raw and cooked meat, dairy, fish and seafood. They also thrive in ready-to-eat foods including filled sandwiches and any foods containing ingredients such as mayonnaise and pate.\u00a0<\/span><\/li>\n<li><b> Moisture<\/b><span style=\"font-weight: 400;\"> - Bacteria need water to live. They cannot multiply in dried (dehydrated) foods, for example, dried pasta or rice, and powdered milk.\u00a0<\/span><\/li>\n<li><b> Warmth<\/b><span style=\"font-weight: 400;\"> - Bacteria multiply rapidly between <\/span><b>8\u00b0C and 63\u00b0C.<\/b><span style=\"font-weight: 400;\"> This is known as the<\/span> <b><i>Danger Zone.\u00a0 <\/i><\/b><span style=\"font-weight: 400;\">Understanding the threat of the Danger Zone is vitally important to food safety.\u00a0<\/span><\/li>\n<li><b> Time<\/b><span style=\"font-weight: 400;\"> - Over time, if the above factors are present, bacteria will continue to multiply. In optimal conditions multiplication will happen very quickly<\/span><\/li>\n<\/ol>\n<h2><strong>How to prevent bacterial multiplication<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">To prevent bacteria multiplying to a dangerous level we need to:\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Minimise the time high risk food spends in the Danger Zone<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Chill and use high-risk foods according to the manufacturer\u2019s instructions<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Cook, and reheat following your approved processes<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Serve, cool and refrigerate, or hot hold food promptly<\/span><\/li>\n<\/ul>\n<h2>Bacterial toxins and spores<\/h2>\n<p><span style=\"font-weight: 400;\">Many pathogenic bacteria release poisonous substances called toxins. Cooking kills most pathogenic bacteria but the toxins left behind can still cause illness. Toxins are one of the reasons why appropriate and continuous chilled and frozen storage is so important to food safety.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Several pathogenic bacteria are resistant to extreme temperatures. They achieve this by developing a protective shell known as a spore. When returned to the optimal conditions, they start multiplying again. Rice is particularly susceptible to spore forming pathogenic bacteria.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">No cooking, reheating or other process will make food safe once bacterial toxins are present. This means that you should keep raw and high-risk foods in the chiller and throw away if in doubt.<\/span><\/p>\n<h2>Pathogenic Viruses<\/h2>\n<p><span style=\"font-weight: 400;\">We are constantly exposed to pathogenic viruses. Some can be confused with food poisoning, due to similar symptoms, for example Norovirus. Sometimes a new pathogenic virus emerges from which we have no immunity, for example Coronavirus\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Pathogenic viruses spread person-to-person through airborne particles produced when an infected person coughs or sneezes, and when contaminated hands touch and contaminate other surfaces and objects.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The key to defeating the threat of all pathogenic viruses is to <\/span><i><span style=\"font-weight: 400;\">break the chain of contamination<\/span><\/i><span style=\"font-weight: 400;\">. Appropriate distancing, hand-hygiene, cleaning and disinfection, teamwork and early illness reporting are all key to defeating pathogenic viruses.\u00a0<\/span><\/p>\n<h2><b data-path-to-node=\"4,0\" data-index-in-node=\"0\">Knowledge is Your First Line of Defence<\/b><\/h2>\n<p>Biological hazards - from fast-multiplying bacteria to resilient viruses - remain the leading cause of foodborne illness in the UK. But they don't have to be a risk to your kitchen. Preventing biological contamination doesn't require a degree in microbiology; it simply requires a solid understanding of time and temperature controls, cross-contamination prevention, and robust hygiene habits. Whether you are an individual looking to step into the food industry or a manager protecting an entire business, mastering these fundamentals is the best insurance you can have. Ready to build your confidence and lock in your compliance? Explore our fully accredited <a href=\"https:\/\/www.thesaferfoodgroup.com\/food-hygiene-level-2-catering.php\"><b data-path-to-node=\"4,0\" data-index-in-node=\"711\">Level 2 Food Hygiene courses<\/b><\/a> today.<\/p>\n<h2 data-path-to-node=\"8\"><b class=\"\" data-path-to-node=\"8\" data-index-in-node=\"0\">Frequently Asked Questions<\/b><\/h2>\n<h4 data-path-to-node=\"9\"><b class=\"\" data-path-to-node=\"9\" data-index-in-node=\"0\">What is the difference between a biological hazard and biological contamination?<\/b><\/h4>\n<p id=\"p-rc_b82b5871e95ef894-20\" class=\"\" data-path-to-node=\"10\"><span class=\"citation-3\">A biological hazard is the <\/span><i data-path-to-node=\"10\" data-index-in-node=\"27\"><span class=\"citation-3\">harmful agent itself<\/span><\/i><span class=\"citation-3 citation-end-3\"> (such as Salmonella or Norovirus).<\/span> Biological contamination occurs when that hazard accidentally gets introduced into food - for example, if raw chicken juices drip onto a ready-to-eat salad.<\/p>\n<h4 data-path-to-node=\"11\"><b class=\"\" data-path-to-node=\"11\" data-index-in-node=\"0\">What is the \"Danger Zone\" for biological hazards?<\/b><\/h4>\n<p class=\"\" data-path-to-node=\"12\">The Temperature Danger Zone is between <b class=\"\" data-path-to-node=\"12\" data-index-in-node=\"39\">5\u00b0C and 63\u00b0C<\/b>. In this range, pathogenic bacteria can multiply rapidly, sometimes doubling in number every 20 minutes. Keeping cold foods below 5\u00b0C and cooking hot foods thoroughly ( for example, to at least 75\u00b0C, or 70\u00b0C for two minutes) is essential to stop bacterial growth.<\/p>\n<h4 data-path-to-node=\"13\"><b class=\"\" data-path-to-node=\"13\" data-index-in-node=\"0\">Can cooking destroy all biological hazards?<\/b><\/h4>\n<p class=\"\" data-path-to-node=\"14\">Thorough cooking kills most vegetative pathogenic bacteria (like E. coli and Salmonella) and viruses. However, cooking <b class=\"\" data-path-to-node=\"14\" data-index-in-node=\"119\">cannot<\/b> destroy certain heat-resistant toxins or bacterial spores (such as those produced by <i data-path-to-node=\"14\" data-index-in-node=\"211\">Bacillus cereus<\/i> or <i data-path-to-node=\"14\" data-index-in-node=\"230\">Staphylococcus aureus<\/i>) if food has been left in the Danger Zone for too long before cooking. Prevention during storage is just as vital as cooking.<\/p>\n<h4 data-path-to-node=\"15\"><b class=\"\" data-path-to-node=\"15\" data-index-in-node=\"0\">What training do I need to understand and manage biological hazards legally?<\/b><\/h4>\n<p class=\"sr-highlight\" data-path-to-node=\"16\">If you are a food handler manually preparing or cooking food, a <a href=\"https:\/\/www.thesaferfoodgroup.com\/food-hygiene-level-2-catering.php\"><b data-path-to-node=\"16\" data-index-in-node=\"64\">Level 2 Food Hygiene Certificate<\/b><\/a> covers everything you need to know about biological hazards, cross-contamination, and temperature control. If you are a supervisor, kitchen manager, or business owner responsible for implementing a HACCP food safety management system, a <a href=\"https:\/\/www.thesaferfoodgroup.com\/food-hygiene-level-3.php\"><b data-path-to-node=\"16\" data-index-in-node=\"334\">Level 3 Food Supervisor Certificate<\/b><\/a> is recommended.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A key part of good food safety practice is removing, or at least minimising, the [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":2104,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[5],"tags":[],"class_list":["post-2187","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-food-safety"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Biological hazards in food - The Safer Food Group<\/title>\n<meta name=\"description\" content=\"Biological hazards are a major food safety risk. 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