This study tries to determine if mosquitoes are able to transport the PRRS virus form one swine herd to another. To achieve this the study looked into the duration of viability and the site of PRRS virus within the mosquitoes. The researchers evaluated if PRRS could be transported to a susceptible pig by mosquitoes who had fed on an infected pig 7-14 days earlier. The tests consisted of 100 mosquitoes that fed on a pig which was experimentally induced with PRRS. The mosquitoes were then kept alive under lab conditions. 10 mosquitoes were then collected a various time intervals: at 0 hour (h), 6 h, 12 h, 24 h, 48 h, 72 h, 5 days (d), 7 d, 10 d, and 14 d post-feeding. Samples of various mosquito parts were taken to determine if they were PRRS positive. Infectious PRRS that would infect pigs was only found on the gut homogenates of mosquitoes collected at 0 and 6 hours post feeding. The second experiment involved 30 mosquitoes who feed on  PRRS infected pig and then after 7, 10 and 14 days after feeding the mosquitoes were allowed to feed on a PRRS negative pig. The PRRS negative pig did not contract the virus nor did the mosquitoes have any traces of PRRS on them. This lead to the indication that mosquitoes are not a likely source of biological vectors for PRRS.