A novel detection method for Alaria alata mesocercariae in meat

Area of Science:

• Veterinary Parasitology
• Food Safety
• Wildlife Health

Background:

• Distomum musculorum suis (DMS), the mesocercarial stage of Alaria alata, is a parasite found in wild boars.
• Human larval alariosis cases highlight the potential risk of consuming infected game meat, particularly wild boar.
• Current knowledge gaps exist regarding DMS prevalence and the efficacy of existing inspection methods for wild boar meat.

Purpose of the Study:

• To evaluate the suitability of official Trichinella spp. digestion methods for detecting DMS in wild boars.
• To develop, optimize, and validate new methods for DMS detection.
• To analyze the distribution patterns of DMS within paratenic hosts, specifically wild boars.

Main Methods:

• Analysis of 868 samples from 48 wild boars using the official Trichinella detection method (Regulation (EC) No. 2075/2005).
• Application of a modified digestion method using pancreatin and bile acid for adipose tissue samples (n=89).
• Development and application of a novel larvae migration technique for DMS detection in 574 single samples.

Main Results:

• The official Trichinella spp. digestion method is unsuitable for detecting Alaria alata mesocercariae in wild boar meat due to digestion and sampling limitations.
• The newly developed larvae migration technique demonstrated nearly 60% higher sensitivity in detecting DMS compared to the official magnetic stirrer method.
• The new method is simple, highly applicable, fast, cost-effective, and suitable for routine veterinary inspection of wild boar meat.

Conclusions:

• The official digestion method for Trichinella is inadequate for detecting DMS in wild boar meat.
• A novel larvae migration technique significantly improves the detection sensitivity of DMS in wild boar tissues.
• This new method provides a reliable tool for ensuring the safety of wild boar meat for consumers.