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A Deadly Fungus That Can Infect Cats and People is Spreading

Shared from Science News.

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 “somewhat terrifying,” 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.

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’t yet in the United States … that officials know of. But the disease, caused by Sporothrix brasiliensis, 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.

“What we have right now is this ginormous ongoing outbreak of Sporothrix brasiliensis in Brazil,” 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 Uruguay.

“It’s just a matter of time” until the fungus reaches the United States, Lockhart told me after the session. “We’re waiting.”

Here’s why he’s so concerned.

He worries about the fungus spreading in big cities such as Istanbul and Bangkok where “cats are just everywhere,” and in rural areas in the United States where large populations of farm cats roam freely. “All it takes is one traveler [from South America] bringing their cat with them, and it can emerge anywhere,” Lockhart said during the presentation. “This is something we are very, very worried about.”

Infected cats develop skin ulcers and nodules and swollen lymph glands. If the infection isn’t treated with antifungal drugs, it can become a respiratory disease and spread throughout the body. “Without treatment, it’s 100 percent fatal, and even with treatment, it has a pretty high fatality rate,” 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.

Risk of contagion is complicated because symptoms don’t 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’s two cats turns out to have been infected with Sporothrix brasiliensis. A vet who treated the cat was also infected.

The fungi’s unusual properties may help it conquer new territory.

The cat-infecting fungus is a relative of Sporothrix schenckii fungi that cause skin infections, called sporotrichosis or rose growers’ disease. Like many other soil-dwelling fungi, Sporothrix fungi are dimorphic, meaning they have two forms. “It is a mold in the cold and a yeast in the beast,” 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.

Most fungal infections happen when people inhale spores or, in the case of rose growers’ disease, when spores enter skin through scratches and puncture wounds from rose thorns. But S. brasiliensis can spread in its yeast form, Lockhart said. “That doesn’t happen with any of the other dimorphic fungi.”

Cat behavior may be why felines seem more susceptible to catching S. brasiliensis, Lockhart said. “Those of you who have cats, you know they do two things: They’re loving all over each other, grooming each other, licking, or they’re fighting, biting and scratching. Those are their two most frequent activities, both of which allow the transfer of Sporothrix brasiliensis from one to another.”

Cat scratches and bites may inject the yeast directly into other cats, people, dogs and other animals. “I’m convinced that half of the human cases that come from cats are people who are trying to stuff pills down their cat’s throats to treat the sporotrichosis,” getting scratched and bitten in the process. Grooming may also spread the fungus around the cat’s body or to other cats, he said.

The fungus has another unusual means of spread: Cats can sneeze out infectious yeast, researchers reported in Medical Mycology in 2022. “When the cat’s sneezing, it’s going on the surface, it’s going on the lab coats, it’s going into the air, it’s going everywhere,” Lockhart says.

The firehose of fungus-laden snot from a cat’s nose might also pose a danger to humans and felines after the infected cat has left the room. That’s 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, Candida albicans, fungi that people naturally carry and that sometimes cause yeast infections, lasted 48 hours. Candida auris, a fungus that can cause infections in those with weakened immune systems, died after about a month, he said.

S. brasiliensis’ 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.

There’s no commercially available test for S. brasiliensis 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.

Which is correct!

But this is often framed as me approaching the right wing naively by the respondent.

That's not the case at all. I know they're evil. The goal is to demonstrate that they're lying by exposing the way the rhetoric fails to line up with reality.

Kabul, Afghanistan

Astana, Kazakhstan

Bishkek, Kyrgyzstan

Islamabad, Pakistan

Dushanbe, Tajikistan

Ashgabat, Turkmenistan

Tashkent, Uzbekistan

And after getting over my initial (rather emotional) response, I wanted to reply properly, and explain just why that hit me so hard.

So back around twenty years ago, the internet cosplay and costuming scene was very different from today. The older generation of sci-fi convention costumers was made up of experienced, dedicated individuals who had been honing their craft for years.  These were people who took masquerade competitions seriously, and earning your journeyman or master costuming badge was an important thing.  They had a lot of knowledge, but – here’s the important bit – a lot of them didn’t share it.  It’s not just that they weren’t internet-savvy enough to share it, or didn’t have the time to write up tutorials – no, literally if you asked how they did something or what material they used, they would refuse to tell you. Some of them came from professional backgrounds where this knowledge literally was a trade secret, others just wanted to decrease the chances of their rivals in competitions, but for whatever reason it was like getting a door slammed in your face.  Now, that’s a generalization – there were definitely some lovely and kind and helpful old-school costumers – but they tended to advise more one-on-one, and the idea of just putting detailed knowledge out there for random strangers to use wasn’t much of a thing.  And then what information did get out there was coming from people with the freedom and budget to do things like invest in all the tools and materials to create authentic leather hauberks, or build a vac-form setup to make stormtrooper armor, etc.  NOT beginner friendly, is what I’m saying.

Then, around 2000 or so, two particular things happened: anime and manga began to be widely accessible in resulting in a boom in anime conventions and cosplay culture, and a new wave of costume-filled franchises (notably the Star Wars prequels and the Lord of the Rings movies) hit the theatres.  What those brought into the convention and costuming arena was a new wave of enthusiastic fans who wanted to make costumes, and though a lot of the anime fans were much younger, some of them, and a lot of the movie franchise fans, were in their 20s and 30s, young enough to use the internet to its (then) full potential, old enough to have autonomy and a little money, and above all, overwhelmingly female.  I think that latter is particularly important because that meant they had a lifetime of dealing with gatekeepers under our belts, and we weren’t inclined to deal with yet another one.  They looked at the old dragons carefully hoarding their knowledge, keeping out anyone who might be unworthy, or (even worse) competition, and they said NO.  If secrets were going to be kept, they were going to figure things out for ourselves, and then they were going to share it with everyone.  Those old-school costumers may have done us a favor in the long run, because not knowing those old secrets meant that we had to find new methods, and we were trying – and succeeding with – materials that “serious” costumers would never have considered.   I was one of those costumers, but there were many more – I was more on the movie side of things, so JediElfQueen and PadawansGuide immediately spring to mind, but there were so many others, on YahooGroups and Livejournal and our own hand-coded webpages, analyzing and testing and experimenting and swapping ideas and sharing, sharing, sharing.  

I’m not saying that to make it sound like we were the noble knights of cosplay, riding in heroically with tutorials for all.  I’m saying that a group of people, individually and as a collective, made the conscious decision that sharing was a Good Things that would improve the community as a whole.  That wasn’t necessarily an easy decision to make, either. I know I thought long and hard before I posted that tutorial; the reaction I had gotten when I wore that armor to a con told me that I had hit on something new, something that gave me an edge, and if I didn’t share that info I could probably hang on to that edge for a year, or two, or three.  And I thought about it, and I was briefly tempted, but again, there were all of these others around me sharing what they knew, and I had seen for myself what I could do when I borrowed and adapted some of their ideas, and I felt the power of what could happen when a group of people came together and gave their creativity to the world.

And it changed the face of costuming.  People who had been intimidated by the sci-fi competition circuit suddenly found the confidence to try it themselves, and brought in their own ideas and discoveries.  And then the next wave of younger costumers took those ideas and ran, and built on them, and branched out off of them, and the wave after that had their own innovations, and suddenly here we are, with Youtube videos and Tumblr tutorials and Etsy patterns and step-by-step how-to books, and I am just so, so proud.  

So yeah, seeing appreciation for a 17-year-old technique I figured out on my dining-room table (and bless it, doesn’t that page just scream “I learned how to code on Geocities!”), and having it embraced as a springboard for newer and better things warms this fandom-old’s heart.  This is our legacy, and a legacy the current group of cosplayers is still creating, and it’s a good one.  

OP also invented armsocks.

Two 34-year-old single fathers.

> Artist only draws skinny people >> No one says anything > Artist draws all people with body fat >> They apparently have some sort of fat fetish > Artist draws everyone aggressively white / pale >> No one says anything > Artist has all POC ocs >> It's "blackwashing" (its literally their own ocs) > Artist draws all trans people as perfectly passing >> No one says anything > Artist draws trans people that dont pass as well and dont fit into the cisgender norms (women with facial hair, men with hips, etc) >> They're making caricatures with the intent of harming people