Calf diptheria, Biology


Calf diptheria
The disease is a serious one usually affecting calves up to 2 years of age. The lesions are confined to larynx and pharynx, and consist of well-defined areas of necrosis which are adherent to the surrounding and underlying inflamed tissue. The disease may be enzootic. Fusobacterium necrophorum is the causative organism which is a gram-negative anaerobic bacilli.


Symptoms: There is painful moist cough with respiratory dyspnoea, excessive salivation, inability to swallow food, loss of appetite and increased body temperature. The animal loses condition rapidly due to lack of nutrition and toxin liberated by the organism. Necrotic patches develop on the mucous membrane in any part of mouth and larynx. A false membrane, adherent to the parts underneath is formed; when removed it leaves deep ulcers. In some cases the condition spreads to lung and liver  where secondary necrotic lesions develop. In acute and severe cases death may occur within a week after the onset of symptoms. Death may be caused due to toxaemia and obstruction to the respiratory passage.


Diagnosis: The nature of lesions are suggestive of calf diphtheria. The disease is confirmed by examining smears after staining with Gram’s stain or methylene blue, and isolating and identifying the organism. When a rabbit is inoculated with material from a suspected case, necrotic lesion develops at the site or inoculation, and the rabbit dies in 2 to 3 weeks.


Control: Attention should be given to hygiene to avoid the predisposing factor.Rough feed should not be given. Sulphonamides and penicillin can be used for treatment of early cases.

Posted Date: 9/17/2012 6:16:20 AM | Location : United States







Related Discussions:- Calf diptheria, Assignment Help, Ask Question on Calf diptheria, Get Answer, Expert's Help, Calf diptheria Discussions

Write discussion on Calf diptheria
Your posts are moderated
Related Questions
Biomass energy Energy produced by burning biomass it is known as biomass energy. When biomass is burnt, it releases stored chemical energy, which has accumulated in it through

Problem-solving essay. Maximum 800 words. Deadline 12th of March. Show me you understand what this essay requires

Explain about the Adequate Intake (AI)? If sufficient data are not available to establish an EAR and hence RDA, the AI is derived instead. The AI is derived from observations o

Hardy desert shrubs - having short stem, number of branches and thick leaves. The animals of deserts are primarily arthropods, reptiles, birds and mammals. Large animals are unc

Q. Definition of Biological diversity? Biological diversity has no single standard definition. One definition holds that biological diversity is a measure of the relative diver

To ensure the building's resistance to potential earthquakes it should be configured, detailed and constructed accordingly. Any weakness in this regard may affect the building's re

Biota of Oceans - Ecosystem Life in the sea is not particularly abundant, though the diversity of organisms is very high. Almost every major group of animals and every major g

Starch gelatinization Undamaged starch granules are insoluble in cold water but can imbibe water  reversibly i.e. they can swell slightly and then return to their original siz

What is Contact Plate Method? Contact Plate (RODAC - Replicate Organism Direct Agar Contact) Method - Contact plates are special petri plates containing suitable agar media wit

What is Cilia and Flagella? The surfaces of many eukaryotic cells bear cilia or flagella, built from specialized microtubules. Cilia are tiny brushlike hairs, and flagella are