The Bubonic Plague of England; 1348-1350 ..

Septicemic plague often develops secondarily to bubonic plague, and is a result of direct invasion of the bloodstream without involvement of the lymph nodes.

Due to the lack of buboes, symptoms generally resemble the flu and make diagnosis difficult.
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Another chronicle, the Book of Pluscarden says that the victims were: 'attacked with inflammation and lingered barely four and twenty hours.' Given the virulence of the plague and the symptoms described, it seems likely that the cold Scottish weather provoked an outbreak of pneumonic plague, with the complication of septicaemia.

the bubonic plague of Europe in ..

Infected fleas that attached themselves to rats and then to humans spread this bubonic type of the plague.
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The first outbreak of plague swept across England in 1348-49. It seems to have travelled across the south in bubonic form during the summer months of 1348, before mutating into the even more frightening pneumonic form with the onset of winter. It hit London in September 1348, and spread into East Anglia all along the coast early during the new year. By spring 1349, it was ravaging Wales and the Midlands, and by late summer, it had made the leap across the Irish Sea and had penetrated the north. The Scots were quick to take advantage of their English neighbours' discomfort, raiding Durham in 1349. Whether they caught the plague by this action, or whether it found its way north via other means, it was taking its revenge on Scotland by 1350.