{"id":105150,"date":"2026-06-17T19:12:13","date_gmt":"2026-06-17T23:12:13","guid":{"rendered":"https:\/\/www.adviews.info\/news\/?p=105150"},"modified":"2026-06-17T19:12:13","modified_gmt":"2026-06-17T23:12:13","slug":"a-deadly-fungus-that-can-infect-cats-and-people-is-spreading","status":"publish","type":"post","link":"https:\/\/www.adviews.info\/news\/?p=105150","title":{"rendered":"A deadly fungus that can infect cats and people is spreading"},"content":{"rendered":"<p>WASHINGTON \u2014 Microbiologists are used to looking at gross pictures and hearing scary statistics. So when a moderator of a session on emerging fungal infections at the ASM Microbe meeting uttered the words \u201csomewhat terrifying,\u201d it caught my attention. He was referring to a sexually transmitted skin infection that is becoming increasingly drug resistant. But what came next was even more horrifying to me.<\/p>\n<p>Medical mycologist Shawn Lockhart stepped to the podium and began describing a fungal disease that attacks cats, causing oozing skin ulcers and worse, and spreads to humans. It isn\u2019t yet in the United States \u2026 that officials know of. But the disease, caused by <em>Sporothrix brasiliensis,<\/em> has sickened and killed thousands of cats and infected more than 11,000 people and at least 200 dogs in South America since its emergence in Brazil in the 1990s.<\/p>\n<aside class=\"sn-conversion rich-text rich-text--with-sidebar\">\n<p>We summarize the week&#8217;s scientific breakthroughs every Thursday.<\/p>\n<p>                        input[type=&#8221;radio&#8221;].svelte-wecxzz{display:none}.payment-option-wrapper.svelte-wecxzz.svelte-wecxzz{display:flex;flex:1 0 28%;width:100%}.payment-option-wrapper.svelte-wecxzz.svelte-wecxzz:only-child{max-width:325px}.box-container.svelte-wecxzz.svelte-wecxzz{display:flex;flex-direction:column;flex:1 1 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var(&#8211;zephr-input-borderColor);&#8211;zf-payment-options-borderRadius:calc(var(&#8211;zephr-input-borderRadius) * 1px);&#8211;zf-payment-options-highlighted-color:var(&#8211;zephr-color-text-main);&#8211;zf-payment-options-highlighted-bgColor:var(&#8211;zephr-color-accent-main);&#8211;zf-payment-summary-fontSize:var(&#8211;zf-subtext-fontSize);&#8211;zf-payment-summary-color:var(&#8211;zephr-color-text-main);&#8211;zf-payment-summary-bgColor:var(&#8211;zf-input-bgColor);&#8211;zf-payment-summary-border:calc(var(&#8211;zephr-input-borderWidth) * 1px) solid var(&#8211;zephr-input-borderColor);&#8211;zf-payment-summary-borderRadius:calc(var(&#8211;zephr-input-borderRadius) * 1px);&#8211;zf-list-subscriptions-container-maxWidth:630px;&#8211;zf-list-subscriptions-container-padding:24px;&#8211;zf-list-subscriptions-section-padding:16px 0px;&#8211;zf-list-subscriptions-container-border:calc(var(&#8211;zephr-input-borderWidth) * 1px) solid var(&#8211;zephr-input-borderColor);&#8211;zf-list-subscriptions-container-borderRadius:calc(var(&#8211;zephr-input-borderRadius) * 1px);&#8211;zf-list-subscriptions-info-fontSize:var(&#8211;zf-info-fontSize)}.zephr-form.svelte-jjl1p8{color:var(&#8211;zf-container-color);margin:var(&#8211;zf-container-margin);font-size:var(&#8211;zf-root-fontSize);font-family:var(&#8211;zf-root-fontFamily)}.zephr-form *{box-sizing:border-box}:where(.zephr-form) button{text-transform:unset;overflow:visible;font-family:var(&#8211;zf-root-fontFamily, unset);font-size:var(&#8211;zf-root-fontSize, unset);line-height:unset;margin:unset;padding:unset;border:unset;background:unset;&amp;:hover, &amp;:focus-visible {<br \/>\n            border: unset;<br \/>\n            background: unset;<br \/>\n        }}.zephr-form-disabled-div{pointer-events:none;opacity:0.8}.zephr-form-relative-container{position:relative}.zephr-form-flex-container{display:flex}.zephr-form-input-inner-button{cursor:pointer;position:absolute;top:50%;transform:translateY(-50%);right:5px;padding:10px 5px}.zephr-form-input-inner-text{color:var(&#8211;zephr-color-text-main);font-size:var(&#8211;zf-subtext-fontSize);font-weight:bold;font-family:var(&#8211;zf-root-fontFamily)}<br \/>\n]]&gt;<\/p>\n<\/aside>\n<p>\u201cWhat we have right now is this ginormous ongoing outbreak of <em>Sporothrix brasiliensis<\/em> in Brazil,\u201d Lockhart, a senior adviser at the U.S. Centers for Disease Control and Prevention, said June 7. The fungus has spread beyond Brazil to cats, dogs and people in Paraguay, Chile, Argentina and most recently <a href=\"https:\/\/higiene.edu.uy\/vigilancia-epidemiologica-en-el-instituto-de-higiene-identifican-brote-de-hongo-transmitido-por-gatos\/\" target=\"_blank\" rel=\"noopener\">Uruguay<\/a>.<\/p>\n<p>\u201cIt\u2019s just a matter of time\u201d until the fungus reaches the United States, Lockhart told me after the session. \u201cWe\u2019re waiting.\u201d<\/p>\n<p>Here\u2019s why he\u2019s so concerned.<\/p>\n<p>He worries about the fungus spreading in big cities such as Istanbul and Bangkok where \u201ccats are just everywhere,\u201d and in rural areas in the United States where large populations of farm cats roam freely. \u201cAll it takes is one traveler [from South America] bringing their cat with them, and it can emerge anywhere,\u201d Lockhart said during the presentation. \u201cThis is something we are very, very worried about.\u201d<\/p>\n<figure class=\"wp-block-image alignleft size-full\"><figcaption class=\"wp-element-caption\"><span class=\"caption wp-caption-3173268\"><em>Sporothrix brasiliensis<\/em> infections cause oozing skin ulcers in cats (an infected feline shown). Without treatment the infection can spread to the lungs and throughout the body, even killing the cat.<\/span><span class=\"credit wp-credit-3173268\">H. Montenegro <em>et al<\/em>\/<em>BMC Veterinary Research<\/em>, 2014<\/span><\/figcaption><\/figure>\n<p>Infected cats develop skin ulcers and nodules and swollen lymph glands. If the infection isn\u2019t treated with antifungal drugs, it can become a respiratory disease and spread throughout the body. \u201cWithout treatment, it\u2019s 100 percent fatal, and even with treatment, it has a pretty high fatality rate,\u201d Lockhart said. In people, it causes painful skin ulcers. If untreated, the disease can also be severe and may kill those who have weakened immune systems.<\/p>\n<p>Risk of contagion is complicated because symptoms don\u2019t always show up right away. Two members of a family who moved from Brazil to the United Kingdom developed the disease three years after the move, health authorities reported in 2022. One of the family\u2019s two cats turns out to have been infected with <em>Sporothrix brasiliensis<\/em>. A vet who treated the cat was also infected.<\/p>\n<p>The fungi\u2019s unusual properties may help it conquer new territory.<\/p>\n<p>The cat-infecting fungus is a relative of <em>Sporothrix schenckii<\/em> fungi that cause skin infections , called sporotrichosis or rose growers\u2019 disease. Like many other soil-dwelling fungi, <em>Sporothrix<\/em> fungi are dimorphic, meaning they have two forms. \u201cIt is a mold in the cold and a yeast in the beast,\u201d Lockhart said. That means it grows as long, stringy filaments known as hyphae in soil but then changes to single-celled yeast when its spores infect people or animals. \u00a0<\/p>\n<p>Most fungal infections happen when people inhale spores or, in the case of rose growers\u2019 disease, when spores enter skin through scratches and puncture wounds from rose thorns. But <em>S. brasiliensis<\/em> can spread in its yeast form, Lockhart said. \u201cThat doesn\u2019t happen with any of the other dimorphic fungi.\u201d<\/p>\n<aside class=\"sn-conversion rich-text rich-text--with-sidebar\">\n<p class=\"has-text-align-center\">Sponsor Message<\/p>\n<p><!-- Tag ID: sciencenews-org_leaderboard_incontent --><br \/>\n<\/aside>\n<h3 class=\"wp-block-heading\">One fungus, two forms<\/h3>\n<p>In soil, <em>Sporothrix brasiliensis<\/em> grows as long threads called hyphae (right) but in the body the fungus transforms into single-celled yeast (left) like these taken from a wound from an infected cat. Shown are yeast (oblong shapes with white outlines) in and among feline immune cells (larger cells). Usually spores from fungi are inhaled or enter through breaks in the skin, but the yeast form of <em>S. brasiliensis<\/em> is also contagious.<\/p>\n<figure class=\"wp-block-image \"><figcaption><span class=\"credit mobile-credit wp-credit-3173270\">A. Barros <em>et al<\/em>\/<em>Brazilian Journal of Veterinary Research<\/em>, 2025<\/span><span class=\"credit desktop-credit wp-credit-3173269\">A. Barros <em>et al<\/em>\/<em>Brazilian Journal of Veterinary Research<\/em>, 2025<\/span><\/figcaption><\/figure>\n<p>Cat behavior may be why felines seem more susceptible to catching <em>S. brasiliensis<\/em>, Lockhart said. \u201cThose of you who have cats, you know they do two things: They\u2019re loving all over each other, grooming each other, licking, or they\u2019re fighting, biting and scratching. Those are their two most frequent activities, both of which allow the transfer of <em>Sporothrix brasiliensis<\/em> from one to another.\u201d<\/p>\n<p>Cat scratches and bites may inject the yeast directly into other cats, people, dogs and other animals. \u201cI\u2019m convinced that half of the human cases that come from cats are people who are trying to stuff pills down their cat\u2019s throats to treat the sporotrichosis,\u201d getting scratched and bitten in the process. Grooming may also spread the fungus around the cat\u2019s body or to other cats, he said.<\/p>\n<p>The fungus has another unusual means of spread: Cats can <a href=\"https:\/\/academic.oup.com\/mmy\/article\/60\/Supplement_1\/myac072P462\/6706543\" target=\"_blank\" rel=\"noopener\">sneeze out infectious yeast<\/a>, researchers reported in <em>Medical Mycology<\/em> in 2022. \u201cWhen the cat\u2019s sneezing, it\u2019s going on the surface, it\u2019s going on the lab coats, it\u2019s going into the air, it\u2019s going everywhere,\u201d Lockhart says.<\/p>\n<p>The firehose of fungus-laden snot from a cat\u2019s nose might also pose a danger to humans and felines after the infected cat has left the room. That\u2019s because the fungi may live a long time on surfaces, Lockhart said. Up to 10 weeks, according to one lab experiment testing how long the fungi could grow on stainless steel discs that mimic the examination tables in veterinary offices. By contrast, <em>Candida albicans<\/em>, fungi that people naturally carry and that sometimes cause yeast infections, lasted 48 hours. <em>Candida auris<\/em>, a fungus that can cause infections in those with weakened immune systems, died after about a month, he said.<\/p>\n<p><em>S. brasiliensis<\/em>\u2019 persistence means that if veterinarians miss a spot while cleaning, the lingering fungus could infect other patients. The good news is that the fungi is easily killed with bleach and ethanol, Lockhart said.<\/p>\n<p>There\u2019s no commercially available test for <em>S. brasiliensis<\/em> and cats coming into the United States just need a certificate from a vet saying that they appear healthy. That makes the disease easy to miss.<\/p>\n<p>Because veterinarians may be the first to notice when the fungus arrives in a new country, Lockhart urged pet health professionals to notify local public health labs or the CDC if they start seeing cases of sporotrichosis. \u201cThere is an opportunity for it to spread quite easily,\u201d he said. \u201cWe need veterinarians working with infection prevention and public health to make sure that this doesn\u2019t get here and happen in the U.S.\u201d<\/p>\n","protected":false},"excerpt":{"rendered":"<p>WASHINGTON \u2014 Microbiologists are used to looking at gross pictures and hearing scary statistics. So when a moderator of a session on emerging fungal infections at the ASM Microbe meeting uttered the words \u201csomewhat terrifying,\u201d it caught my attention. He was referring to a sexually transmitted skin infection that is becoming increasingly drug resistant. But [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[10],"tags":[],"_links":{"self":[{"href":"https:\/\/www.adviews.info\/news\/index.php?rest_route=\/wp\/v2\/posts\/105150"}],"collection":[{"href":"https:\/\/www.adviews.info\/news\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.adviews.info\/news\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.adviews.info\/news\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.adviews.info\/news\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=105150"}],"version-history":[{"count":0,"href":"https:\/\/www.adviews.info\/news\/index.php?rest_route=\/wp\/v2\/posts\/105150\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.adviews.info\/news\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=105150"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.adviews.info\/news\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=105150"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.adviews.info\/news\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=105150"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}