Children embrace cats, kiss them. That intimacy carries a cost.
Rio de Janeiro saw sporotrichosis cases jump from 579 in 2013 to 1,518 in 2022; child infections under 15 surged 653% in the same period. Only cats transmit the fungus to humans through scratches, bites, or respiratory droplets; symptoms include non-healing wounds and lymph node inflammation.
- Rio de Janeiro: 579 cases in 2013 to 1,518 cases in 2022 (162% increase)
- Children under 15: 26 cases in 2013 to 196 cases in 2022 (653% increase)
- Only cats transmit sporotrichosis to humans; transmission via scratches, bites, respiratory droplets
- Treatment requires 3+ months of oral antifungal medication; limited pediatric options available
- Disease present in Brazil, Argentina, Paraguay, Uruguay, and Chile
Sporotrichosis, a fungal infection transmitted by cats, is spreading alarmingly across Brazil and South America, with cases in Rio de Janeiro increasing 162% in a decade and child infections rising 653%.
A fungal infection spread by cats is moving through Brazil with unusual speed, and children are being hit hardest. Sporotrichosis—caused by the fungus Sporothrix brasiliensis—has been climbing steadily across several South American countries, but the numbers in Brazil tell a story of accelerating crisis. In Rio de Janeiro alone, confirmed cases nearly tripled over a decade, jumping from 579 in 2013 to 1,518 by 2022. What makes this trajectory alarming is not just the overall rise, but the velocity of infection among the youngest patients. Children under fifteen went from 26 cases to 196 cases in that same nine-year span—a 653 percent increase that has drawn urgent attention from infectious disease specialists.
Flavio Telles, an infectologist who coordinates the mycology committee at Brazil's Society of Infectious Diseases and teaches at the Federal University of Paraná, raised the alarm during a national infectious disease congress in Salvador. The disease exists across the region—cases have appeared in Argentina, Paraguay, Uruguay, and Chile—but Brazil's outbreak is the most severe. What complicates the full picture is that sporotrichosis is not universally reportable at the national level. Only certain municipalities and states, like Mato Grosso do Sul, have made it mandatory to log cases, meaning the true number of infections across the country remains unknown.
The fungus lives in nature, hiding in organic materials: thorns, twigs, soil, straw, decaying wood. Infection happens when contaminated material pierces the skin. Dogs can catch it, but only cats transmit it to humans—through scratches, bites, or respiratory droplets. The disease manifests as wounds that refuse to heal, small red bumps that develop into pustules, and swollen lymph nodes that track along the body's drainage pathways. In people with weakened immune systems, it can reach the lungs and bones. Most infections cluster on the hands, feet, belly, and face—wherever the initial contact occurred.
Children face particular vulnerability, not because their bodies are more susceptible, but because of how they interact with cats. They embrace them, kiss them, press their faces close. This intimacy means their facial wounds are common, and the scars that follow can reshape how they see themselves and how others see them. The psychological weight of visible scarring during childhood development is real and lasting. Treatment compounds the difficulty: antifungal medication must be taken orally for at least three months, often much longer, and pediatric options are scarce. Dosing depends on weight, and there simply aren't many drugs formulated for children.
The rise in child infections reflects a failure to control the disease in the cat population itself. Infected cats develop deep, oozing wounds that don't close and sneeze frequently—signs their owners often miss or misinterpret. Diagnosis in humans is frequently confused with bacterial infection at first; only a mycological test confirms it. Once diagnosed, treatment cannot be interrupted or the infection will persist. Without proper care, sporotrichosis can be fatal, though it is not inherently a severe disease.
Prevention is straightforward: avoid direct contact with organic materials where the fungus might live. Wear gloves, long sleeves, and proper shoes when handling soil, straw, or branches. But the guidance for infected cats carries an equally important message: they should never be abandoned or killed. Treatment exists for them too. If a cat shows signs—wounds on the face, ears, or paws, or frequent sneezing—it must be isolated from people and other animals, examined by a veterinarian, and treated. The household must be cleaned with sodium hypochlorite. If the cat dies, it should be cremated promptly by a veterinarian, never buried or discarded in trash.
What's unfolding in Brazil is a collision between urban wildlife, domestic animals, and human behavior. The fungus has always been there. What has changed is the density of cats in cities, the closeness of human-animal contact, and perhaps the conditions that allow the disease to spread unchecked. The 653 percent surge in child infections is not a statistical anomaly—it is a signal that something in the system has shifted, and children are bearing the visible cost.
Notable Quotes
The situation with sporotrichosis is alarming and spreading across several Brazilian states— Flavio Telles, infectologist and coordinator of the mycology committee at Brazil's Society of Infectious Diseases
The Hearth Conversation Another angle on the story
Why are children being infected at such a different rate than adults?
It's not that children's immune systems are weaker to this particular fungus. It's that they live differently with cats. A child will hug a cat, kiss it, rub their face against it. An adult is more cautious. So when an infected cat scratches or bites, the wound ends up on a child's face or near their eyes. That's where the scarring happens.
And the scarring matters beyond just appearance?
It matters enormously. You're talking about a child whose face is marked during the years when they're forming their sense of self and their place among peers. A scar on the hand is one thing. A scar on the cheek or near the eye is something they see every time they look in a mirror, and every time someone looks at them.
The source mentions that treatment is "more delicate" for children. What does that mean practically?
The antifungal drugs work, but dosing is based on weight, and there aren't many options made specifically for kids. An adult might have three or four medications to choose from. A child might have one. And the treatment runs for months—sometimes over a year. Stopping early means the infection comes back.
Why isn't this disease being tracked nationally if it's spreading this fast?
Because it's not mandatory to report it everywhere. Only some states and municipalities decided to make it compulsory. So Rio de Janeiro has good data showing a 162 percent jump in a decade. But you look at the rest of Brazil and you're essentially blind. The real number could be much higher.
The source emphasizes that cats shouldn't be abandoned. Why is that message necessary?
Because people panic. When they learn their cat has a fungal infection that can spread to them, their first instinct is to get rid of the animal. But cats can be treated just like humans. The message is: don't abandon your cat. Isolate it, get it to a vet, treat it. The disease is manageable if you don't run away from it.