The head of Blair County’s emergency management agency says the chemical being used to help prevent the spread of the West Nile Virus is not harmful to humans.
 
Dan Boyles says his office has been inundated with calls from concerned residents questioning whether or not officials were spraying pesticides. Boyles says it’s a bio-chemical mist designed specifically to kill mosquitoes. He says that doesn’t mean residents shouldn’t take precautions.
 

 
The state will spray parts of Altoona, Hollidaysburg, plus Logan, Blair and Frankstown Townships for a second time later this week. Blair County has registered more than 60 mosquitoes that have tested positive for the virus – a record number compared to previous years.