In the operating hatchers, the contamination of air by aerobic bacteria, coliform, and
fungi was high, measuring over 300 cfu/63.6 cm2. In the egg sorting room, contamination was moderate,
whereas in the remaining sampling sites such as the setter room, candling-transfer room, and chick counting room, contamination was minimal, measuring less than 10 cfu/63.6 cm2 for aerobic bacteria, 5 cfu/63.6 cm2 for coliform, and 2 cfu/63.6 cm2 for fungi.