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Farmer’s Lung and Silo Filler’s Disease

Farmer’s Lung and Silo Filler’s Disease. ACVPM 2007 Study Group Dawn Fitzhugh. Farmer’s Lung. Other names Hypersensitivity pneumonitis Extrinisic allergic alveolitis Hypersensitivity alveolitis. Farmer’s Lung . Causes Breathing in certain allergy-causing dusts such as that from moldy hay

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Farmer’s Lung and Silo Filler’s Disease

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  1. Farmer’s Lung and Silo Filler’s Disease ACVPM 2007 Study Group Dawn Fitzhugh

  2. Farmer’s Lung • Other names • Hypersensitivity pneumonitis • Extrinisic allergic alveolitis • Hypersensitivity alveolitis

  3. Farmer’s Lung • Causes • Breathing in certain allergy-causing dusts such as that from moldy hay • Also from any other moldy crop such as tobacco, straw, corn, silage, etc.. • Aspergillus most common mold • Micropolyspora faeni and Termoactinomyces vulgaris most common bacteria

  4. Farmer’s Lung • Epidemiology • Farmers, esp dairy farmers late winter or early spring in wet weather regions • Clinical signs • General malaise • Breathing problems sim to pneumonia • Acute, subacute or chronic presentation

  5. Farmer’s Lung • Prevention • Dry crops before storage • Work in ventilated areas or outdoors • Wet down dusty areas prior to working in them • Wet hay should be ensiled—key to stopping mold growth • Consider respirator

  6. Farmer’s Lung • References • Canada’s Oc Health Website: • http://www.ccohs.ca/oshanswers/diseases/farmers_lung.html • National Ag Safety Database • http://www.cdc.gov/nasd/docs/d001501-d001600/d001538/d001538.html

  7. Silo Filler’s Disease • A disease caused by the inhalation of nitrogen oxides • Toxic levels of NO, NO2, N204 are all produced in silos • These gases are dense and settle in the chute and base of the silo • NO2 is brown and has an odor • N204 is colorless and odorless • When inhaled, they make nitric acid

  8. Silo Filler’s Disease • Clinical signs • Mild exposure: cough, chest tightness • Large exposure: vascular collapse, shock, death • Other sources of nitrogen oxide gases: • Furnaces, diesel fumes

  9. Silo Filler’s Disease • Prevention • Do not enter a recently filled silo • Wait at least 2 weeks to enter • Possible toxic exp if silo unopened even after 2 weeks • Allow silo to “air out” 20 mins before entering • Wear PAPR respirator • Know corn, oats, heavily fertilized crops more likely to yield nitrogen oxides

  10. Silo Filler’s Disease • References: • MMWR weekly: • http://www.cdc.gov/MMWR/preview/mmwrhtml/00001135.htm

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