Role of enhanced vector transmission of a new West Nile virus strain in an outbreak of equine disease in Australia in 2011

Table 2 Infection, dissemination and transmission rates in Culex australicus and Culex annulirostris exposed to 10 ^8.1 and 10 ^7.6 TCID ₅₀ /mL of the WNV _KUN2011 and WNV _KUN2009 strains, respectively, and tested at day 12 post-exposure

	Infection^a				Dissemination^b				Dissemination/infection^c				Transmission^d				Transmission/dissemination^e
Species	KUN2011		KUN2009		KUN2011		KUN2009		KUN2011		KUN2009		KUN2011		KUN2009		KUN2011		KUN2009
Cx. australicus	68	(17/25)	50	(11/22)	60	(15/25)	41	(9/22)	88	(15/17)	82	(9/11)	20	(5/25)*	18	(4/22)*	33	(5/15)*	44	(4/9)
Cx. annulirostris	68	(17/25)	60	(9/15)	68	(17/25)	60	(9/15)	100	(17/17)	100	(9/9)	68	(17/25)	53	(8/15)	100	(17/17)	89	(8/9)

^aPercentage of mosquitoes containing virus in their bodies (number positive/number tested).
^bPercentage of mosquitoes containing virus in their legs and wings (number positive/number tested).
^cPercentage of infected mosquitoes containing virus in their legs and wings (number positive/number infected).
^dPercentage of mosquitoes containing virus in the saliva expectorates (number positive/number tested).
^ePercentage of mosquitoes with a disseminated infection containing virus in the saliva expectorates (number positive/number disseminated).
*Fisher’s exact test P-value <0.05 for comparisons between Cx. australicus and Cx. annulirostris.

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