The Centers for Disease Control and Prevention should have results later this month that provide more insight into how a Missouri resident, who hadn’t had any contact with infected animals or food, contracted a case of highly pathogenic avian influenza.

Hospital workers reported respiratory symptoms after encountering a Missouri patient with H5N1 who had not been exposed to farm animals. Officials say bird flu transmission is unlikely.

Kern County Public Health announced an ongoing investigation Saturday into a person who possibly came in contact with a cow infected with bird flu. An individual working at a dairy farm has potentially been infected with H5N1 bird flu after coming in contact with a cow carrying the virus,