...This substance is used all over the country, though in some places the venom of serpents and a certain bulb, 'Amaryllis toxicaria', are added, in order to increase the virulence... 
David Livingstone 「Missionary Travels and Researches in South Africa」
...The larvæ of the genusAdolia are also hairy, and sting with virulence...
J. Emerson Tennent 「Sketches of the Natural History of Ceylon」
...The disease leaves the surfaceonly, and its virulence fixes upon the internal parts...
Dinks, Mayhew, and Hutchinson 「The Dog」
...On the other hand, it is known that the serum from affected lungs retainsits virulence and may be used successfully for inoculation weeks or monthsafter the death of the animal from which it was taken...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...Thereafter it continued to exist to agreater or less extent until in 1911 it attained a virulence unequaled before...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...Thedisease has manifested itself with more or less virulence at St...
Honoré Bourguignon 「On the cattle plague: or, Contagious typhus in horned cattle. Its history, origin, description, and treatment」
...And with the lowering ofresistance and the lack of sufficient sanitary arrangements, diseasebegan to spread with ever increasing rapidity and virulence...
Various 「Astounding Stories, July, 1931」
...Errors thus assailed speedily entrench themselvesin general feelings, and become embalmed in the virulence of thepassions...
David Brewster 「The Martyrs of Science, or, The lives of Galileo, Tycho Brahe, and Kepler」
...In the year 1789 they were visited by a disorder which raged among them with all the appearance and virulence of the small-pox...
David Collins 「An Account of the English Colony in New South Wales, Vol. 1」
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