Info Request: How much of 1848 Europe would be affected by a SARS like virus?

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After the Ango-Russian War of 1790 TL im planning a TL in which 1848 Europe succumbs to first a SARS like Coronavirus borne via Pigs and then a mutated version borne via Wheat. How much of Continental Europe (ie barring Britain, Ireland, the Balearics, Sicily, Crete etc) would be able to succumb to such a virus?