That bit was about Lupine Parvovirus for the game wolves, The Ethereal Manes, yep!
The too long; didn't read of the effect of Lupine Parvovirus for your wolves is:
-> your wolves will be stronger during full moons at night in Explore because there's a chance they will hit twice.
-> your wolves are weakened by the virus if it is not a nighttime full moon.
If you don't find the trade off worth it, you can cure it with Silver Salve. Either buy it from other players under Realm > Marketplace > Barter > Search, and look for Silver Salves for sale in other user's Market Dens or you can craft it yourself from Beeswax, Grapeseed, and Wolfsbane under Relics > Craft.
Here's the bit from the News page on it:
"Be careful! If you become infected your wolf will become weakend, except during the Nighttime Full Moon, when they will have Werewolf Colassal Speed and have a great chance at hitting twice!
To heal the infection you will need to craft a special Salve. The ingredients are provided by the interlopers."
This event happens anually, always beginning on the first and ending at the end of August. You can read the original news annoucement about it if you click through The Daily Howl and go back to August 1st. =)