I was in a forest area last night and got about 5 or 6 mosquito bites.wat are the chances of getting west nile or zika?i live in cook county, illinois

Yes and No: There are mosquitoes carrying West Nile virus in the Chicago or Cook County areas, but the chances of an individual person getting infected by the virus or of getting a symptomatic infection from the virus, are not known. Yes, one can catch it, but the CDC reported 72 cases for Illinois 2015, which is not a big number. As for Zika, it is not yet in Chicago or Cook County mosquitoes.

IN 2018 - very low: Per the CDC, provisional data as of October 31, 2018 showed 2 cases of zika virus in Illinois. REF: https://www.cdc.gov/zika/reporting/2018-case-counts.html , Per the Illinois Department of Public Health: "Currently, the only Zika virus cases in Illinois are travel associated." The Aedes aegypti mosquito (primary vector) is rare in Illinois.