National Veterinary Associates (NVA) has been hit with the Ryuk ransomware, in an attack that affects 400 clinics across the country.
The California company said that it could take a week for its facilities to be fully back up and running normally. Patient records, payment systems and practice management software were all locked up in the attack.
NVA said it discovered the ransomware outbreak on Oct. 27 and hired two outside security firms to help it recover. Affected clinics now have regained access to patient records.