Why in News?
Rumen flukes (amphistomes) made news because around 70 cattle recently died in the Kendrapada district of Odisha. The local chief district veterinary officer attributed these livestock deaths to a severe parasitic disease caused by rumen flukes, which are also locally known as 'Kurmi'.
Biological Profile & Lifecycle
- The Organism: Rumen flukes are parasitic digenean trematodes (flatworms) that primarily target domestic and wild ruminants like cattle, buffaloes, sheep, and goats.
- Dual-Stage Habitats: Inside the animal, the adult parasites live in the rumen (stomach), while the highly destructive immature larval forms colonise the small intestine.
- The Snail Vector: The parasite cannot spread directly between cattle; it mandatorily requires an intermediate aquatic or mud snail host to mature its larvae.
- Mode of Transmission: Livestock accidentally ingest the infectious larval stage (metacercariae) while drinking contaminated water or grazing on wet vegetation near water bodies.
Clinical Symptoms & Disease (Paramphistomosis)
- The Root Cause: While adult worms in the stomach are relatively harmless, massive numbers of immature larvae in the small intestine cause severe, life-threatening duodenitis (tissue erosion).
- "Plug Feeding" Damage: Larvae physically bury into the intestinal walls to extract nutrients, a process known as plug feeding, which severely alters the intestinal mucosa.
- Key Warning Signs: Infected animals display severe watery diarrhoea, rapid weight loss, dullness, and submandibular oedema—a distinct fluid swelling under the jaw popularly called "bottle jaw".
- Economic Impact: Even in non-fatal cases, the infection drastically causes poor feed conversion, reduces milk yields, and impacts meat mass.
Treatment and Prevention
- Targeted Medication: The disease is combated using specialized anthelmintic medicines (dewormers) formulated to flush out parasitic worms.
- Pasture Management: Preventing outbreaks requires fencing off wet, swampy grazing zones and controlling local snail populations near drinking troughs.
Download Pdf
