What is the relative infectious dose for FMD?

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Multiple Choice

What is the relative infectious dose for FMD?

The main idea here is the infectious dose—the number of virus particles needed to establish infection in exposed hosts, typically the amount that will infect about half of those exposed (RID50) under common exposure routes. Foot-and-mouth disease virus is extraordinarily efficient at starting infection, especially via mucosal surfaces such as the nasal or oral route or through inhalation. Because of this high efficiency, only a very small number of virions is usually required to begin infection and kick off transmission. Among the given options, about ten virions best fits the well-known low RID for FMDV. This reflects the virus’s ability to initiate infection with a tiny inoculum, which helps explain why FMD is so highly contagious in livestock. While infections can occasionally occur with even fewer particles depending on the exact route of exposure, the conventional estimate used in practice and exams is around ten virions.

The main idea here is the infectious dose—the number of virus particles needed to establish infection in exposed hosts, typically the amount that will infect about half of those exposed (RID50) under common exposure routes. Foot-and-mouth disease virus is extraordinarily efficient at starting infection, especially via mucosal surfaces such as the nasal or oral route or through inhalation. Because of this high efficiency, only a very small number of virions is usually required to begin infection and kick off transmission.

Among the given options, about ten virions best fits the well-known low RID for FMDV. This reflects the virus’s ability to initiate infection with a tiny inoculum, which helps explain why FMD is so highly contagious in livestock. While infections can occasionally occur with even fewer particles depending on the exact route of exposure, the conventional estimate used in practice and exams is around ten virions.

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