3,326
edits
Changes
mLine 136:
Line 136: − + + + + + + − + − + − + + + + + + + + + + + + + + + + + + + + + + + + + +
→Zygomycosis
*Caused by strains of ''Mucor, Absidia, Rhizopus'' and ''Mortierella''
*Caused by strains of ''Mucor, Absidia, Rhizopus'' and ''Mortierella''
**Occurs widely in nature
**''Mucor circinelloides''(rare), ''Rhizomucor pusillus'' and ''R. meihi''
**''Absidia corymbifera'' often causes zygomycosis in cattle and pigs
**''Rhizopus arrhizus, R. microsporus'' and ''R. rhizopodormis''
**''Mortierella wolfi'' implicated in bovine abortion (mycotic placentitis), ''M. hygrophila'' in fowl and ''M.polycephala'' in cattle
*Occurs widely in nature
*Infection is by inhalation and ingestion
*Infection is by inhalation and ingestion
*Infects lymph nodes of the respiratory and alimentary tract
*Infects [[Lymph Nodes - Anatomy & Physiology|lymph nodes]] of the [[Cardiorespiratory System - Anatomy & Physiology|respiratory]] and [[Alimentary - Anatomy & Physiology|alimentary tract]]
**Lymph nodes enlarge and become caseous
**[[Lymph Nodes - Anatomy & Physiology|Lymph nodes]] enlarge and become caseous
**Can cause stomach and intestinal ulcers
**Can cause [[Alimentary - Anatomy & Physiology#Stomach|stomach]] and [[Small Intestine - Anatomy & Physiology|intestinal]] ulcers
*Granulomatous lesions which can ulcerate
*Granulomatous lesions which can ulcerate
*Mostly localised lesions but can be generalised
*Mostly localised lesions but can be generalised
*Pigs
**Mediatinal and submandibular [[Lymph Nodes - Anatomy & Physiology|lymph nodes]] lesions
**Embolic tumours in the [[Liver - Anatomy & Physiology|liver]] and [[Lungs - Anatomy & Physiology|lungs]]
**Can also be present in gastric ulcers
*Cattle
**Bronchial, mesenteric and mediastinal [[Lymph Nodes - Anatomy & Physiology|lymph nodes]] lesions
**Ulcers of the [[Nasal cavity - Anatomy & Physiology|nasal cavity]] and [[The Abomasum - Anatomy & Physiology|abomasum]] also occur
**Often contaminate the [[Gestation -Placenta - Anatomy & Physiology|placenta]]
*Horses, dogs, cats, sheep, mink, guinea-pigs and mice can also be infected
*Microscopically:
**Fragments of non-septate hyphae which are branched and coarse
**''Rhizomucor'' produce a thick, grey mycelium and have short, black, spherical sporangia
**''Mucor'' produce thick, colourless mycelium with no rhizoids. Globose spoangia with small spores are present and sporagiospores are simple or branched.
**''Absidia'' resemble ''Rhizopus'' grossly
**''Mortierella'' produce white, velvet colonies on Sabouraud's Dextrose and Blood agar
*Grows on Sabauraud's Dextrose agar
*Treatment is with [[Antifungal Drugs#Polyene Antifungals|Amphotericin B]]
**Surgery is also an option in treatment
**Common contaminants
==Further Links==
==Further Links==
*[[Antifungal Drugs]]
*[[Antifungal Drugs]]