'virulent outbreak' is a correct and usable phrase in written English.
You can use it to refer to a sudden and severe infection that quickly spreads among a large number of individuals, e.g. "The recent virulent outbreak of the flu has caused many to stay home from work."
The most virulent outbreak was the second wave, which ran from September until early December 1918.
Nigeria is experiencing a particularly virulent outbreak with 89 people infected and six deaths since 2017.
For health officials, it could inform decisions on how to stockpile and distribute vaccines and antiviral drugs, and in the case of a virulent outbreak, whether other measures, like closing schools, are necessary.
All bird keepers, from poultry farmers to families with a few chickens, have been ordered to house their animals for a month to protect the UK from a virulent outbreak of avian flu on mainland Europe.
Mr. Obama said his administration was focused both on the immediate threat posed by the H1N1 virus, as well as the possibility that a more virulent outbreak could be looming months away.
Mainly, though, we've been afflicted with a virulent outbreak of rueful savviness, as the pundits have explained why the Nobel is a very, very bad political development for the White House.
White pox was first documented off the Florida Keys in 1996, with virulent outbreaks observed in 2003 and 2009.
Oftentimes, the percentage of gunshot-wound deaths during virulent outbreaks far exceeds 30percentt.
The specter of untreatable and virulent outbreaks, local or pandemic, increases with each decade; as a review put it a decade ago, "Antimicrobial resistance has reached crisis stage in human medicine".
Rapid H5N1 identification will assist in pinpointing the source of particularly virulent outbreaks, and in targeting limited supplies of vaccines and anti-virals to key regions.
Furthermore, a short-lived peak coincides with the unusually virulent outbreaks of primarily pneumonic plague in Manchuria in 1910-1911 and 1920-1921 [ 34].
