1887

Abstract

SUMMARY:

Small samples of hay were shaken in a perforated drum in a wind of 4·2 m./sec.; the liberated dust cloud was sampled with the cascade impactor for microscopical examination, and with the Andersen sampler for identification of organisms in culture. The results of testing batches of hay showed large differences in microbial content. Twenty-eight batches classed as ‘good hay’ gave up to 3 million spores/g. dry wt. hay, mainly with spp. and . Dust blown from seventeen batches of ‘mouldy hay’ differed greatly in composition and had from 5 to 250 million spores/g.: abundant forms included spp., spp., , bacteria, many actinomycetes. Fourteen batches of mouldy hay associated with cases of ‘farmer's lung’ disease were generally similar in mould content to the batches of mouldy hay, but had many more spores of and , and were specially characterized by very many actinomycetes. Farmer's lung hays tended to neutrality (averaging pH 7·0, as compared with pH 5 to 6 of other hays), and were rich in thermophilic organisms, commonly with hundreds of millions of actinomycete spores/g., a large proportion of which grew readily at 60°. Hays associated with farmer's lung appear to have heated spontaneously to a higher temperature during maturation than the other hays. Dust from all hays contained particles of higher plants, but there were not obviously more in farmer's lung than in other hays. All types of spores were shown to be potentially able to penetrate to the deeper parts of the lung (especially the spores of actinomycetes, and ), but whether these organisms play any part in the aetiology of the disease is unknown.

Loading

Article metrics loading...

/content/journal/micro/10.1099/00221287-30-1-75
1963-01-01
2021-08-04
Loading full text...

Full text loading...

/deliver/fulltext/micro/30/1/mic-30-1-75.html?itemId=/content/journal/micro/10.1099/00221287-30-1-75&mimeType=html&fmt=ahah

References

  1. Andersen A. A. 1958; New sampler for the collection, sizing, and enumeration of viable airborne particles. J. Bact. 76:471
    [Google Scholar]
  2. Brierley W. B., Jewson S. T., Brierley M. 1927; The quantitative study of soil fungi. Proc. Int. Congr. Soil Sci., Washington 3:48
    [Google Scholar]
  3. Browne C. A. 1929; The spontaneous combustion of hay. U.S.D.A. Technical Bull.14138
    [Google Scholar]
  4. Campbell J. M. 1932; Acute symptoms following work with hay. Brit. med. J. 2:1143
    [Google Scholar]
  5. Davies C. N. 1952; Dust sampling and lung disease. Brit. J. Industr. Med. 9:120
    [Google Scholar]
  6. Eastwood D. J. 1948; The fungus flora of composts. Trans. Brit, mycol. Soc. 35:215
    [Google Scholar]
  7. Forsyth W. G. C., Webley D. M. 1948; The microbiology of composting. II. A study of the aerobic thermophilic bacterial flora developing in grass composts. Proc. Soc. appl. Bact. 11:34
    [Google Scholar]
  8. Frank R. C. 1958; Farmer’s lung—a form of pneumoconiosis due to organic dusts. Amer. J. Roentgenol. 79:189
    [Google Scholar]
  9. Fuller C. J. 1958 Farmer’s lung; in Fungous Diseases and Their Treatment. 138 Ridell R. W., Stewart G. T. London: Butterworth;
    [Google Scholar]
  10. Gregory P. H., Lacey M. E. 1962; The isolation of thermophilic actinomycetes. Nature, Lond. 195:95
    [Google Scholar]
  11. Gregory P. H., Lacey M. E. 1963; Liberation of spores from mouldy hay. Trans. Brit, mycol. Soc. in the Press
    [Google Scholar]
  12. May K. R. 1945; The cascade impactor: an instrument for sampling coarse aerosols. J. Sci. Instrum. 22:187
    [Google Scholar]
  13. Miehe Η. 1930; Über die Selbsterhitzung des Heues. (2. Aufl.). Arb. dtsch. LandwG. 196:1
    [Google Scholar]
  14. Truninger E. 1929; Allgemeine Beobachtungen und Untersuchungen über Wesen, Ursache und Verlauf der Selbsterhitzung und Selbstentzündung von Dürrfutter. Landw. Jb. Schweiz 43:278
    [Google Scholar]
  15. Webley D. M. 1947; The microbiology of composting. I. The behaviour of the aerobic mesophilic bacterial flora of composts and its relation to other changes taking place during composting. Proc. Soc. appl. Bact. 10:83
    [Google Scholar]
  16. Zoberi Μ. Η. 1961; Take-off of mould spores in relation to wind speed and humidity. Ann. Bot., Lond. 25:53
    [Google Scholar]
http://instance.metastore.ingenta.com/content/journal/micro/10.1099/00221287-30-1-75
Loading
/content/journal/micro/10.1099/00221287-30-1-75
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error