A party with three castles

In autumn 2025, about 120 neighbors in Ireland gathered for a barbecue, a sweets station, and three bouncy castles. Roughly half the crowd were children and teens.

Symptoms within a day

Children started showing signs of infection within 24 hours. In total, 48 developed aggressive skin and soft-tissue infections, 15 needed emergency care, and four were hospitalized. All recovered.

One hospital case blew it open

Health officials only learned of the outbreak nine days later, when a 12-year-old boy was hospitalized. By then roughly 25 milder cases were already out there.

A flesh-attacking toxin

Sequencing identified a rare MRSA strain that makes Panton-Valentine leukocidin, a cytotoxin that kills immune cells and is linked to necrotic lesions.

“This toxin can destroy immune cells and spark inflammation.”

Faster and rougher than usual

Most kids fell ill within four days instead of the usual 4 to 10, and some within hours. Spots, pustules, blisters and abscesses hit mainly the thighs and legs.

Resistant to four drugs

The strain, t016-ST22-MRSA-IV, shrugged off flucloxacillin, ciprofloxacin, gentamicin and trimethoprim. Clindamycin, tetracycline, linezolid and others still worked.

Why the castle was perfect

Kids bounced for five or six hours in a crowded, rough-and-tumble scrum on a humid, rainy day. Scrapes opened the skin and wet warmth kept the bacteria happy.

47 of 48 had been inside

Every case but one had played in the castles, and that child had close contact with an infected kid right after. No other exposure explained it. Officials skipped swabbing and told owners to decontaminate.

A first, and a warning

This was Ireland's largest MRSA outbreak and the first anywhere tied to bouncy castles. Investigators think one infected child seeded the surfaces, and they want owners cleaning between events.

“unusual and complex with a novel mechanism”