What is the time window during which American Foulbrood affects larvae?

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Multiple Choice

What is the time window during which American Foulbrood affects larvae?

Explanation:
American Foulbrood primarily attacks the youngest brood. The Paenibacillus larvae spores need to be ingested when the larva is still very young, and the gut environment at about 24 to 48 hours after hatching is when germination and multiplication are most likely to occur. Because of this, infection is most reliably expressed during that early window. If the larva is older than about two days, susceptibility drops and the classic disease presentation is unlikely, so the infection is not typically seen in older larvae. In short, the critical period for larvae being affected is roughly the first 1–2 days after hatch, about 24–48 hours.

American Foulbrood primarily attacks the youngest brood. The Paenibacillus larvae spores need to be ingested when the larva is still very young, and the gut environment at about 24 to 48 hours after hatching is when germination and multiplication are most likely to occur. Because of this, infection is most reliably expressed during that early window. If the larva is older than about two days, susceptibility drops and the classic disease presentation is unlikely, so the infection is not typically seen in older larvae. In short, the critical period for larvae being affected is roughly the first 1–2 days after hatch, about 24–48 hours.

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