Confirmed cases of cryptosporidiosis linked to the Butterfield Acres petting farm in Calgary, Alberta, have risen to 17 [2].
The outbreak highlights the risks of zoonotic transmission in interactive animal environments, where highly contagious parasites can spread quickly from livestock to humans.
Health officials said the outbreak began April 28, 2024 [3]. At that time, the province reported five initial cases [4]. However, 12 additional people tested positive for the parasite in early May 2024 [1].
Investigators traced the infection to one infected calf that was kept on the farm [5]. This animal allowed the parasite to spread to visitors through contact. The infected calf has since been removed from the premises [5], while one twin calf remains in quarantine [6].
Cryptosporidium is a parasite that causes gastrointestinal illness, often characterized by watery diarrhea. Because the parasite is highly contagious, the farm underwent a temporary shutdown to facilitate thorough disinfection of the site.
Butterfield Acres has since resumed operations. The farm reopened Wednesday morning [7].
Officials said they continue to monitor the situation to ensure no further transmissions occur. The rise in case numbers from the initial five to 17 [2, 4] underscores the difficulty of containing the parasite once it enters a public petting area.
“Confirmed cases of cryptosporidiosis linked to the Butterfield Acres petting farm in Calgary, Alberta, have risen to 17.”
This incident demonstrates the vulnerability of petting farms to zoonotic outbreaks, where a single infected animal can trigger a cluster of human infections. The jump from five to 17 cases suggests a period of undetected transmission before the facility was secured. The reopening of the farm indicates that health authorities believe the immediate biological threat has been mitigated through animal removal and environmental disinfection.
