This doesn't sound like anything new. As I understand it, it is well known that there were three distinct forms of plague during the "black death" epidemic: Bubonic, pnuemonic, and septicemic.
Below are quotes from letter sent from the papal court at Avignon in 1348:
"It is said that the plague takes three forms. In the first people suffer an infection of the lungs, which leads to breathing difficulties. Whoever has this corruption or contamination to any extent cannot escape but will die within two days. Another form...in which boils erupt under the armpits,...a third form in which people of both sexes are attacked in the groin.
...
And this form is the most dangerous of all these terrible things, which is to say that it is the most contagious, for when one infected person dies everyone who saw him during his illness, visited him, had any dealings with him, or carried him to burial, immediately follows him, without any remedy." [1]
[1] Letter from Louis Heyligen of Beeringen (27 April 1348) , via "Horrox, Rosemary (1994). Black Death"
Below are quotes from letter sent from the papal court at Avignon in 1348:
"It is said that the plague takes three forms. In the first people suffer an infection of the lungs, which leads to breathing difficulties. Whoever has this corruption or contamination to any extent cannot escape but will die within two days. Another form...in which boils erupt under the armpits,...a third form in which people of both sexes are attacked in the groin.
...
And this form is the most dangerous of all these terrible things, which is to say that it is the most contagious, for when one infected person dies everyone who saw him during his illness, visited him, had any dealings with him, or carried him to burial, immediately follows him, without any remedy." [1]
[1] Letter from Louis Heyligen of Beeringen (27 April 1348) , via "Horrox, Rosemary (1994). Black Death"