Which foulbrood has the shorter susceptible larval window?

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Multiple Choice

Which foulbrood has the shorter susceptible larval window?

Explanation:
Susceptibility in brood diseases is tied to the larva’s age. American foulbrood is caused by Paenibacillus larvae spores that must be ingested by very young larvae—usually within the first 24 hours after egg hatching. After that short window, the larva’s gut environment changes and infection becomes unlikely, making the susceptible period very brief. European foulbrood, caused by Melissococcus plutonius, can infect larvae that are a bit older, extending the window of vulnerability to a few days. Because American foulbrood involves a much narrower age range for infection, it has the shorter susceptible larval window.

Susceptibility in brood diseases is tied to the larva’s age. American foulbrood is caused by Paenibacillus larvae spores that must be ingested by very young larvae—usually within the first 24 hours after egg hatching. After that short window, the larva’s gut environment changes and infection becomes unlikely, making the susceptible period very brief. European foulbrood, caused by Melissococcus plutonius, can infect larvae that are a bit older, extending the window of vulnerability to a few days. Because American foulbrood involves a much narrower age range for infection, it has the shorter susceptible larval window.

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