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Table. 1 Vector competence indexes for WNV of four Italian populations of Cx. pipiens

From: Experimental studies on comparison of the vector competence of four Italian Culex pipiens populations for West Nile virus

  Frascati Legnaro Caffarella Zafferana Chi 2 Test
IR 75 % 90 % 63 % 55 % p = 0.037
(bodies WNV+/tested) (24/32) (19/21) (19/30) (16/29)  
DR 54 % 100 % 68 % 50 % p = 0.001
(legs plus wings WNV+/bodies WNV+) (13/24) (19/19) (13/19) (8/16)  
TR 42 % 37 % 47 % 37 % p = 0.915
(saliva WNV+/bodies WNV+) (10/24) (7/19) (9/19) (6/16)  
PTR 31 % 33 % 30 % 21 % p = 0.758
(saliva WNV+/tested) (10/32) (7/21) (9/30) (6/29)  
  1. The IR, DR, TR and PTR of analysed Cx. pipiens populations were calculated from day 6th to 32nd post infection as following reported: IR (Infection Rate) corresponding to the proportion of mosquitoes with WNV positive body among the total number of fed mosquitoes; DR (Dissemination Rate) corresponding to the proportion of mosquitoes with infected legs plus wings with respect to the number of mosquitoes with infected body; TR (Transmission Rate) corresponding to the proportion of mosquitoes with infected saliva with respect to the number of mosquitoes with infected body; PTR (Population Transmission Rate) corresponding to the proportion of mosquitoes with infected saliva among the total number of fed mosquitoes