About: The outbreak [of potato blight] in Ireland was part of a pandemic—that is, the disease suddenly became widespread and destructive almost simultaneously in several European countries and in the United States as well. [...] [T]he pathogen increased and became widely distributed, so that when the weather became generally and extremely favorable, as happened during the years of the pandemic, it could attack rapidly and in force over a wide area at once.       Sponge   Distinct   Permalink