Aspergillus is a mold; it forms spores. These are extremely resistant to heat, cold, dryness. They can survive a long time and under extremely harsh conditions. Freezing doesn’t achieve anything, it makes it even worse. Heating to boiling point for at least 30 minutes can kill all living form but not the spores. After cooling the spores would germinate. To kill them you have to sterilize them, meaning at 125°C at high pressure. It would be easier to avoid the concerned food.

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