The Laughter Died: It struck so suddenly a man could be in good health at daybreak and he buried at nightfall. A citizen of Port Royal described himself pitching forward in the street "as if knocked down with an ax. I had no premonition at all."

The ailment seemed capable of penetrating any quarantine of harbor or city. It chose its victims erratically, with terrifying suddenness, and with gross and grotesque results.

Acute dehydration turns victims into wizened caricatures of their former selves. The skin becomes black and blue, the hands and feet drawn and puckered. The Dralasite poet Aenlip Aeibe described an outbreak in Valentina in a letter to a friend: "A masked ball in progress ... suddenly the gayest of the harlequins collapsed, cold in the limbs, and underneath his mask, violet blue in the face. Laughter died out, dancing ceased and in a short while carriage-loads of people hurried from the Hotel Uied to die, and to prevent a panic among the patients were thrust into rude graves in their dominoes [long, hooded capes worn with a half-mask). Soon the public halls were filled with dead bodies, sewed in sacks for want of coffins ... long lines of hearses stood in queue..."
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origin from http://www.theplumber.com/plague.html 

Oh humans!!  We discover a galactic community filled with multiple species of aliens, and the first thing we think about is "how can we have sex with them?".
~ anymoose, somewhere on the net...

so...
if you square a square it becomes a cube...
if you square a cube does it become an octoid?

The term plague in the context is far too broad, as is the term cure...
The quarantine... in part... is a cure to the pandemic, and you may think that it is counter intuitive to say someone "cured the plague..." when all they did was enact measures of quarantine protocol... but sometimes that is the answer... and what protocols are necessary are still attributed to the medical doctor that compiled the suggestions and finalized the report, as a "nominal cure" within current capability.
The virulence of the pandemic suggests that it is not, "permanently removable from existence..." and only "environmentally containable, through health precautions, and early detection and actions against threat of spreading a new epidemic..."
The wide spread fatality over multiple species-forms, of completely divergent planetary biospheres, further suggests an aggression and/or mutation rate far exceeding real-world germ/bacteria/environmental causes.
I offer the Andromeda Strain as a sci-fi example in context... and the most likely draw from which it could have been borrowed.
[The Andromeda Strain (1969), by Michael Crichton, is a techno-thriller novel documenting the efforts of a team of scientists investigating a deadly extraterrestrial microorganism that rapidly and fatally clots human blood, while in other people inducing insanity.]

A common misconception (made even in the fiction I suggested), Curing a Plague does not require ever Finding a Cause... many plagues through-out history have been "cured" into "dormancy" -; some indefinitely -; without ever finding the proverbial "smoking gun"... a medical "war" on an encroaching epidemic is not a scenario where-by one gets to know the enemy, it is a war of suppression often fought blindly, and without any guarantees of continued suppression, or target-hit confirmation... Medical Watchers are always vigilant that the next outbreak may be a new epidemic, and contagion may spread it into a new pandemic... until so much time passes that it is ignored, forgotten and resurfaces catching all unaware.
You might be surprised how little is ACTUALLY known as "smoking-gun" fact in the field of warfare aginst the small and imperceptible... and how much just works because educated guess-work provided success without being able to fathom why.
Scientists of every field may want to shoot me now, but it is what it is... every one thing learned leaves 80 things unlearned, and opens up 20 more never thought of... the more we know the more we know we know nothing. It is worth it, but it is an up-hill trek, blundering blindly in the dark, calling out Maro... Polo... until a few heads smack together and get a bright vision of the illusions they have been pondering.

The continued quarantine of infected systems suggests not only that the Blue Plague Pandemic has not been "permanently" cured, but also that it can not be, and a new epidemic is considered a real possibility to the medical community in The Frontier, and that the Plague is still active in some form.

From Wikipedia:

A pandemic (from Greek ??? pan "all" + ????? demos "people") is an epidemic of infectious disease that is spreading through human populations across a large region; for instance multiple continents, or even worldwide. A widespread endemic disease that is stable in terms of how many people are getting sick from it is not a pandemic. Further, flu pandemics generally exclude recurrences of seasonal flu. Throughout history there have been a number of pandemics, such as smallpox and tuberculosis. More recent pandemics include the HIV pandemic and the H1n1 pandemic.

In epidemiology, an epidemic (??? (epi)- meaning "upon or above" and ????? (demos)- meaning "people"), occurs when new cases of a certain disease, in a given human population, and during a given period, substantially exceed what is expected based on recent experience.[1]:354[2] Epidemiologists often consider the term outbreak to be synonymous to epidemic, but the general public typically perceives outbreaks to be more local and less serious than epidemics[2][1]:55, 354

An epidemic may be restricted to one locale, however if it spreads to other countries or continents and affects a substantial number of people, it may be termed a pandemic.[1]:55 The declaration of an epidemic usually requires a good understanding of a baseline rate of incidence; epidemics for certain diseases, such as influenza, are defined as reaching some defined increase in incidence above this baseline.[2] A few cases of a very rare disease may be classified as an epidemic, while many cases of a common disease (such as the common cold) would not.

Plague is a deadly infectious disease that is caused by the enterobacteria Yersinia pestis, named after the French-Swiss bacteriologist Alexandre Yersin. Primarily carried by rodents (most notably rats) and spread to humans via fleas, the disease is notorious throughout history, due to the unrivaled scale of death and devastation it brought. Until June 2007, plague was one of only three diseases specifically reportable to the World Health Organization (the two other ones were cholera and yellow fever).[1] Depending on lung infection, or sanitary conditions, plague also can be spread in the air, by direct contact, or by contaminated undercooked food or materials. The symptoms of plague depend on the concentrated areas of infection in each person: such as bubonic plague in lymph nodes, septicemic plague in blood vessels, pneumonic plague in lungs, and so on. It is treatable if detected early. Plague is still endemic in some parts of the world.

Oh humans!!  We discover a galactic community filled with multiple species of aliens, and the first thing we think about is "how can we have sex with them?".
~ anymoose, somewhere on the net...

so...
if you square a square it becomes a cube...
if you square a cube does it become an octoid?