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Finding a live brain worm is rare. 4 ways to protect yourself from more common parasites

<p><em><a href="https://theconversation.com/profiles/vincent-ho-141549">Vincent Ho</a>, <a href="https://theconversation.com/institutions/western-sydney-university-1092">Western Sydney University</a></em></p> <p><a href="https://www.theguardian.com/australia-news/2023/aug/28/live-worm-living-womans-brain-australia-depression-forgetfulness">News reports</a> this morning describe how shocked doctors removed a live worm from a woman’s brain in a Canberra hospital last year. The woman had previously been admitted to hospital with stomach symptoms, dry cough and night sweats and months later experienced depression and forgetfulness that led to a brain scan.</p> <p>In the <a href="https://wwwnc.cdc.gov/eid/article/29/9/23-0351_article">case study</a> published in Emerging Infectious Diseases journal, doctors describe removing the live 8cm-long nematode (roundworm) from the brain of the 64-year-old woman who was immunosuppressed. The worm was identified as <em>O. robertsi</em> which is native to Australia, where it lives on carpet pythons. The woman may have come into contact with worm eggs via snake faeces while foraging for Warrigal greens to eat.</p> <p>It’s important to note this is an extremely rare event and headlines about brain worms can be alarming. But there are more common parasites which can infect your body and brain. And there are ways you can minimise your risks of being infected with one.</p> <h2>Common parasites and how they get in</h2> <p>Parasitic infection is extremely common. Arguably the most widespread type is pinworm (<em>Enterobius vermicularis</em> also called threadworm), which is thought to be present in <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6522669/">over a billion people</a> worldwide, especially children. Pinworms grow to around 1cm in length and are specific to human hosts. They cause intense bottom itching and get passed from person-to-person. It’s a myth that you can get it from pets.</p> <p><a href="https://www.cdc.gov/parasites/giardia/pathogen.html#:%7E:text=Giardia%20duodenalis%20is%20a%20protozoan,Giard%20of%20Paris%20and%20Dr.">Giardia</a> (<em>Giardia duodenalis</em>) is also very common and can contaminate food, water and surfaces. This water-borne parasite is associated with poor sanitation and causes stomach symptoms like diarrhoea, cramps, bloating, nausea and fatigue. Giardia cysts (little sacs of immature parasite) spread disease and are passed out in faeces, where they can remain viable in the environment for months before being consumed by someone else. They can also be ingested via foods (such as sheep meat) that is raw or undercooked.</p> <p><a href="https://www.cdc.gov/dpdx/hookworm/index.html">Two types</a> of hookworm – <em>Necator americanis</em> and <em>Ancylostoma duadonale</em> – are found in soil. Only <em>Ancylostoma duodenale</em> is an issue in Australia and is typically found in <a href="https://www.cdc.gov/dpdx/hookworm/index.html">remote communities</a>.</p> <p>When a person is infected (usually via barefeet or contaminated footwear) these worms enter the bloodstream and then hit the lungs. From the bronchi in the upper lungs, they are swallowed with secretions. Once in the gut and small bowel they can <a href="https://www.who.int/news-room/fact-sheets/detail/soil-transmitted-helminth-infections#:%7E:text=Transmission,these%20eggs%20contaminate%20the%20soil.">cause anaemia</a> (low iron). This is because they are consuming nutrients and affecting iron absorption. They also release an anticoagulant that stops the human host’s blood clotting and causes tiny amounts of blood loss.</p> <p>Fortunately, these very common parasites do not infect the brain.</p> <p>Across the world, it’s estimated <a href="https://pubmed.ncbi.nlm.nih.gov/22491772/">30–50% of people</a> are infected with <em>Toxoplasma</em>. Most people will be asymptomatic but many carry the <a href="https://theconversation.com/one-in-three-people-are-infected-with-toxoplasma-parasite-and-the-clue-could-be-in-our-eyes-182418">signs of infection</a>.</p> <p>The parasites can remain in the body for years as tiny tissue cysts. These cysts can be found in brain, heart and muscle. Infants can be born with serious eye or brain damage if their mothers are infected during pregnancy. People with compromised immunity – such as from AIDS or cancer treatment – are also at risk of illness from infection via pet cats or uncooked meat.</p> <h2>Then there are tapeworms and amoebas</h2> <p>Tapeworms can infect different parts of the body including the brain. This is called <a href="https://www.cdc.gov/parasites/resources/pdf/npis_in_us_neurocysticercosis.pdf">neurocysticercosis</a> and is the leading cause of epilepsy worldwide. Neurocysticercosis is uncommon in the Western world and infection is usually via eating pork that is uncooked or prepared by someone who is infected with tapeworm (<em>Taenia solium</em>). It is more likely in locations where pigs have contact with human faeces via sewerage or waterways.</p> <figure class="align-right zoomable"><figcaption></figcaption></figure> <p>Tapeworm larvae can infect muscle and soft tissue. Brain tissue can provide a home for larvae because it is soft and easy to get to via blood vessels. Brain infection can cause headaches, dizziness, seizures, cognitive impairment and even dementia, due to an increase in <a href="https://www.cdc.gov/parasites/cysticercosis/gen_info/faqs.html">cerebral spinal fluid pressure</a>.</p> <p><em><a href="https://www.cdc.gov/parasites/naegleria/general.html">Naegleria fowleri</a></em> is an amoeba found in lakes, rivers and springs in warm climates including <a href="https://www.sahealth.sa.gov.au/wps/wcm/connect/public+content/sa+health+internet/public+health/water+quality/naegleria+fowleri#:%7E:text=How%20common%20are%20Naegleria%20fowleri,frequently%20found%20in%20the%20environment.">in Australia</a>. People swimming in infected waters can have the parasite enter their body through the nose. It then travels to the brain and destroys brain tissue. The condition is <a href="https://www.cdc.gov/parasites/naegleria/general.html#:%7E:text=Top%20of%20Page-,What%20is%20the%20death%20rate%20for%20an%20infected%20person%20who,States%20from%201962%20to%202022.">almost always fatal</a>.</p> <h2>Yikes! 4 ways to avoid parasitic infection</h2> <p>That all sounds very scary. And we know being infected by a snake parasite is very rare – finding one alive in someone’s brain is even rarer. But parasites are all around us. To minimise your risk of infection you can:</p> <p><strong>1.</strong> avoid undercooked or raw pork. Freezing meat first may reduce risks (though home freezers <a href="https://www.cdc.gov/parasites/trichinellosis/prevent.html">may not get cold enough</a>) and it must be cooked to a <a href="https://www.sciencedirect.com/science/article/pii/S0924224418301560#:%7E:text=and%20time%20conditions.-,Cooking%20at%20core%20temperature%2060%E2%80%9375%20%C2%B0C%20for%2015,relied%20upon%20in%20home%20situations.">high internal temperature</a>. Avoid pork if you are travelling in places with poor sanitation</p> <p><strong>2.</strong> avoid jumping or diving into warm fresh bodies of water, especially if they are known to carry <em>Naegleria fowleri</em>. Although only a <a href="https://www.cdc.gov/parasites/naegleria/graphs.html">handful of cases</a> are reported each year, you should assume it’s present</p> <p><strong>3.</strong> practise good <a href="https://www.cdc.gov/handwashing/when-how-handwashing.html#:%7E:text=Follow%20Five%20Steps%20to%20Wash%20Your%20Hands%20the%20Right%20Way&amp;text=Wet%20your%20hands%20with%20clean,for%20at%20least%2020%20seconds.">hand hygiene</a> to reduce the risk of rare and common infections. That means washing hands thoroughly and often, using soap, scrubbing for at least 20 seconds, rinsing and drying well. Clip and clean under fingernails regularly</p> <p><strong>4.</strong> to avoid soil-borne parasites wear shoes outside, especially in rural and remote regions, wash shoes and leave them outside.<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/212437/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /></p> <p><em><a href="https://theconversation.com/profiles/vincent-ho-141549">Vincent Ho</a>, Associate Professor and clinical academic gastroenterologist, <a href="https://theconversation.com/institutions/western-sydney-university-1092">Western Sydney University</a></em></p> <p><em>Image credits: Canberra Health </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/finding-a-live-brain-worm-is-rare-4-ways-to-protect-yourself-from-more-common-parasites-212437">original article</a>.</em></p>

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A whole new can of worms for gardeners

<p>Every year, people all over the world set their resolutions for the next 12 months and beyond. While some may not see them all the way through, most dive in with only the best intentions in mind. </p> <p>And whether it’s because of a love of the outdoors, a desire to keep their hands busy on a free day, or even mounting climate anxiety, many take to gardening as a way to give their life a fresh spin. </p> <p>A crucial part of that process? Composting. No matter the crop, composting boasts the growth of healthier and stronger plants. Additionally, it can improve the likes of soil density and its available nutrients, as well as discouraging all kinds of unwanted pests. </p> <p>However, composting has not historically been everyone’s cup of tea. From the smell to the sheer effort, the fear of trying something new, space, flies, and so on, many have opted to steer clear of setting up their own station. </p> <p>But any budding - or established - gardener need not fear, with new innovations in the art of composting making the entire process easier each and every day. </p> <p>The latest trend helping gardener’s around the world find success is commercial vermiculture - better known as “worm farming”. </p> <p>It is said that worm farming - or a similar practice - dates all the way back to Cleopatra VII’s reign. But modern practices, thankfully, prove much simpler, and much easier for the average to maintain at home. </p> <p>While most organic materials leaving the home have the potential to become a nutritious dish of soil for the garden, it’s advised to avoid the likes of oil, meat, orange peels, dairy, pet waste, and plastic when first starting out. </p> <p>So, with the materials likely already at hand, all it takes is someplace to put them - and that’s where the worms come in. </p> <p>Worm farms (or worm composting systems) are the answer to a whole range of composting concerns, and are cited as being easy to maintain, taking minimal time and effort, and able to be installed in even small spaces. </p> <p>Earthworms, reportedly, are even some of the fastest - and best - composters out there. They get to work converting organic household waste into nutrient-rich fertiliser for the garden in the form of worm castings (otherwise known as poo). These castings lead to worm tea, a natural liquid fertiliser that comes from soaking said castings in water. </p> <p>To get started, a gardener needs somewhere for the worms to live and work. For those who want to dive right in, farms are readily available for purchase (like this <a href="https://www.bunnings.com.au/maze-worm-farm_p0137788" target="_blank" rel="noopener">Australian designed farm by Maze</a>, made from recycled materials, or <a href="https://mazeproducts.com.au/product/3tray-worm-farm-with-legs-and-worms-copy/" target="_blank" rel="noopener">a kit with an additional tray and worms included</a>). </p> <p>For gardeners after something of a larger scale, it’s possible to make a worm farm at home with an old bath or even a spare wheelie bin. These <a href="https://wormsdownunder.com.au/shop/140l-worm-habitat/" target="_blank" rel="noopener">can be purchased</a> as well, but if craft is more your style, or you want to save a few dollars, then a quick Google search will provide a host of tutorials to follow. </p> <p>The amount the worms will eat varies depending on a number of factors - how many worms are living there, the size of the farm itself, and environmental conditions such as the weather, as worms will typically eat less during the winter. </p> <p>For food, the worms do require more than just the household waste - “bedding” that’s carbon-rich will go a long way for them, so make sure to keep a steady supply of the likes of shredded newspaper and cardboard on hand. For a little extra helping hand, <a href="https://tumbleweed.com.au/products/worm-blanket-rectangle" target="_blank" rel="noopener">worm blankets</a> can help to increase activity in the farm. </p> <p>The four key levels to remember when structuring such a farm - from bottom to top - are the lining, the worm bedding, the food scraps/household waste, and the worm blanket/cover.</p> <p>It’s important to note that regular garden worms will be no good for this process, as they’re surface feeders and won’t burrow deep into the soil like <a href="https://www.bunnings.com.au/worm-affair-live-organic-worm-starter-pack-approx-1000-worms_p3011353" target="_blank" rel="noopener">earthworms (or compost worms)</a> will. Top of their list of things to snack on are fruit and vegetable scraps, egg shells, grains, paper tea bags, coffee grounds, and newspapers.</p> <p>Once a farm is up and running, and the worms’ castings have been collected, a successful gardener has multiple options at their disposal with the output. From using it in the garden for the soil or with mulch to helping when planting seeds, incorporating it into potting mix, and - of course - making it into some nutritious worm tea. </p> <p><em>Images: Getty </em></p>

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How do magpies detect worms and other food underground?

<p><strong>How do magpies detect worms and other food sources underground? I often see them look or listen, then rapidly hop across the ground and start digging with their beak and extract a worm or bug from the earth – Catherine, age 10, Perth.</strong></p> <p>You have posed a very good question.</p> <p>Foraging for food can involve sight, hearing and even smell. In almost all cases learning is involved. Magpies are ground foragers, setting one foot before the other looking for food while walking, called <a href="http://www.publish.csiro.au/book/7677/" title="Biology and Behaviour of an Unusual Songbird">walk-foraging</a>. It looks like this:</p> <p>Finding food on the ground, such as beetles and other insects, is not as easy as it may sound. The ground can be uneven and covered with leaves, grasses and rocks. Insects may be hiding, camouflaged, or staying so still it is hard for a magpie to notice them.</p> <p>Detecting a small object on the ground requires keen vision and experience, to discriminate between the parts that are important and those that are not.</p> <p>Magpie eyes, as for most birds, are on the side of the head (humans and other birds of prey, by contrast, have eyes that face forward).</p> <p style="text-align: center;"><em><a href="https://images.theconversation.com/files/305806/original/file-20191209-90592-eed4d5.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=1000&amp;fit=clip"><img style="display: block; margin-left: auto; margin-right: auto;" src="https://images.theconversation.com/files/305806/original/file-20191209-90592-eed4d5.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" alt="" /></a> <span class="caption">A magpie’s eyes are at the side of its head and it can only see something with both eyes if that is straight in front of the bird.</span> <span class="attribution"><span class="source">Shutterstock/Webb Photography</span></span></em></p> <p>To see a small area in front of them, close to the ground, birds use both eyes together (scientists call this binocular vision). But birds mostly see via the eyes looking out to the side (which is called monocular vision).</p> <p>This picture gives you an idea of what a magpie can see with its left eye, what it can see with its right eye and what area it can see with both eyes working together (binocular vision).</p> <p>You asked about underground foraging. Some of that foraging can also be done by sight. Worms, for instance, may leave a small mound (called a cast) on the surface and, to the experienced bird, this indicates that a worm is just below.</p> <p>Magpies can also go a huge step further. They can identify big scarab larvae underground without any visual help at all.</p> <p>Scarab larvae look like grubs. They munch on grassroots and can kill entire grazing fields. Once they transform into beetles (commonly called Christmas beetles) they can do even more damage by eating all the leaves off eucalyptus trees.</p> <p>Here is the secret: magpies have such good hearing, they can hear the very faint sound of grass roots being chewed.</p> <p>We know this from <a href="https://www.sciencedirect.com/science/article/pii/S0003347281801121" title="Localization of soil dwelling scarab larvae by the black-backed magpie, Gymnorhina tibicen (Latham)">experiments</a> using small speakers under the soil playing back recorded sounds of scarab beetle larvae. Magpies located the speaker every time and dug it up.<span class="attribution"><a href="http://creativecommons.org/licenses/by-nc-nd/4.0/" class="license"></a></span></p> <p>So how do they do it? Several movements are involved.</p> <p>To make certain that a jab with its beak will hit the exact spot where the juicy grub is, the magpie first walks slowly and scans the ground. It then stops and looks closely at the ground – seemingly with both eyes working together.</p> <p>Then, holding absolutely still, the magpie turns its head so the left side of the head and ear is close to the ground for a final confirming <a href="https://www.researchgate.net/publication/318003665_Audition_and_Hemispheric_Specialization_in_Songbirds_and_New_Evidence_from_Australian_Magpies">listen</a>.</p> <p>Finally, the bird straightens up, then executes a powerful jab into the ground before retrieving the grub.</p> <p><a href="https://images.theconversation.com/files/305292/original/file-20191205-70133-1fvy04l.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=1000&amp;fit=clip"><img src="https://images.theconversation.com/files/305292/original/file-20191205-70133-1fvy04l.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" alt="" /></a> <span class="caption">An Australian magpie digging for food gets a grub.</span> <span class="attribution"><a href="https://en.wikipedia.org/wiki/File:Australian_Magpie_Digging_Grub.jpg" class="source">Wikimedia/Toby Hudson</a>, <a href="http://creativecommons.org/licenses/by-sa/4.0/" class="license">CC BY-SA</a></span></p> <p>That is very clever of the magpies. Very few animals can extract food they can’t see. Only great apes and humans were thought to have this ability. Clever magpies indeed. And farmers love them for <a href="https://www.sciencedirect.com/science/article/pii/S0003347281801121" title="Localization of soil dwelling scarab larvae by the black-backed magpie, Gymnorhina tibicen (Latham)">keeping a major pest under control</a>.</p> <p><em><a href="https://theconversation.com/profiles/gisela-kaplan-2401">Gisela Kaplan</a>, Emeritus Professor in Animal Behaviour, <a href="http://theconversation.com/institutions/university-of-new-england-919">University of New England</a></em></p> <p><em>This article is republished from <a href="http://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/curious-kids-how-do-magpies-detect-worms-and-other-food-underground-125713">original article</a>.</em></p>

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