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Red Stomach Worms (Hyostrongylus rubidus)

(502) This red hair like species is less than 10mm long but can just be seen by the naked eye. It is found world-wide in the stomach and is a common parasite of outdoor pigs particularly sows. It is uncommon in growing pigs.

The life cycle

This is direct. The infective larvae are taken in by the mouth and enter the stomach lining forming nodules. They take about two weeks to become adults which then return to the lumen. The complete event from egg to egg takes approximately three to four weeks. The period from egg to infective larva is from five days onwards and therefore if faeces are removed from the pigs environment more frequently than this, the cycle can be broken. Larvae are destroyed by cold and drying.

Clinical signs

The adult worms burrow into the mucous lining of the stomach where they suck blood and cause an inflammation (gastritis). Heavy infections cause anaemia, poor growth rates, loss of condition, thin sows and occasional episodes of diarrhoea.


This is carried out by identifying the strongyle eggs in the faeces and/or by post-mortem examination. The eggs are similar to those of the nodular and trichostrongylus worms.


  • See Fig.11-9. below
Management control and prevention
  • See introduction.

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