[Comparison of three techniques for the enumeration of Aspergillus fumigatus spores in the hatcher as part of an epidemiologic survey of Aspergillosis risks in hatchery houses]. / Comparaison de trois techniques de numeration des spores d'Aspergillus fumigatus en eclosoir, dans le cadre de la surveillance epidemiologique au couvoir des risques d'aspergillose.

Methods of enumerating Aspergillus fumigatus spores on the down of hatching chicks in swabs of hatcher walls and in lungs of hatching chicks were compared under field conditions as part of an official survey of hatchery houses. Correlations and agreements between the results were studied. Their lack of accuracy is stressed, especially with the swab technique. This impels the aspergillosis risk to be evaluated from the average of the enumerations obtained simultaneously in a set of 10 hatchers.