either [(a) were derived from parent flocks which have been kept in an establishment in which avian influenza surveillance has been carried out with negative results within 21 days prior to the time of collection of eggs;]
either [(a) were derived from parent flocks which have been kept in an establishment in which avian influenza surveillance has been carried out with negative results within 21 days prior to the time of collection of eggs from which the day-old chicks were hatched;]
or [(a) were derived from parent flocks which have been kept in an establishment in which during the past 21 days prior to the collection of the eggs from which the day-old chicks were hatched a virus detection test with negative testing results for avian influenza has been carried out on a random sample of cloacal and tracheal/or oropharyngeal swabs taken from at least 60 poultry in the establishment or from all poultry if less than 60 are present in the establishment;]
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The example sentences [G] were kindly provided by the Goethe Institute. Sentences marked by [EU] derived from DGT Multilingual Translation Memory. The European Commission retains ownership of the copyright in the original data.
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![[listen]](/pics/s1.png "either"){kind=small}
