Merck Manual

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Preventing Trichinellosis (Trichinosis)

Preventing Trichinellosis (Trichinosis)

Trichinosis is a parasitic disease caused by the growth of infective cysts in muscle tissue. Human infections are usually caused by eating undercooked infected meat, usually pork. To protect yourself and your pets, be sure to cook meat to an internal temperature of at least 145°F (63°C) for roasts and 160°F (71°C) for ground meats. Freezing pork at an appropriate temperature for an appropriate time is also effective:

  • 5°F (-15°C) for 20 days,

  • -9.4°F (-23°C) for 10 days, or

  • -22°F (-30°C) for 6 days.

Freezing cannot be relied on to kill cysts in meat other than pork.