ProMed reports 90 persons presented to the Infectious Diseases Hospital Amedeo di Savoia, Torino, North-West Italy between 24 Dec 2019 and 10 Jan 2020 after consuming raw sausages from a wild boar hunted in the area of Susa Valley, 50 km [31.1 mi] away from Torino, in late November 2019.

All of them either were symptomatic (fever, muscle and/or abdominal pain, nausea) or had peripheral blood eosinophilia over 500/cmm, or both. IgG serology for trichinella was performed by immunoblot (Trichinella E/S IgG kit, EFFEGIEMME, Milan, Italy) and resulted positive in 48/90 (53.3%), allowing a diagnosis of confirmed trichinella infection.

Otherwise, a diagnosis of suspected trichinella infection was made with a negative serology, probably due to performing the test too early, before the development of antibodies or possibly a false negative result. In a few cases (under 10 cases) an alternative diagnosis was considered.

All patients were treated with oral albendazole 400 mg twice daily for 10 days and prednisone 50 mg/day.

Most likely, all patients were infected after eating meat from a single animal, given the low prevalence of the infection in this area: no human case has ever been detected in Torino province, and only one wild boar has been found positive for trichinella at microscopy in Susa valley in the last 10 years.