The Sauk County Health Department is alerting county residents to take extra precautions when outdoors at dawn or dusk to prevent mosquito bites when the insects are most active. This increases the likelihood of a person being bitten by one of the bugs carrying West Nile virus. County health officials say the discovery of a dead crow, which tested positive for West Nile, prompted the alert. Health officials say being bitten by a mosquito carrying West Nile does not mean a person will get the disease. Officials say less than one percent of those bitten will get seriously sick requiring a trip to the doctor or hospital.