So a shortage that results from a supply interruption in Nigeria, or somewhere in Africa, is just as significant as a supply interruption, let's say, in the Middle East, or off the coast of Texas--because the whole market is ultimately affected by this.

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"Some school closures may be based on operational interruption due to a significant percentage of student and staff absences, while some school closures may be based on a recommendation of public health to reduce the virus spread, " the department said in a statement.

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