Two cases of bird flu have been reported in San Joaquin County, California, according to local health officials.

According to a news release issued Friday and reported by the Sacramento Bee, San Joaquin County Public Health officials said both cases occurred among farm workers who had contact with infected animals. Both people showed mild symptoms and recovered, officials said, adding that there are a total of 34 confirmed cases across California.

In an alert posted on Facebook, health officials said bird flu was “spreading among some livestock such as poultry and cows” and urged residents to take precautions to prevent the spread of the disease.

Precautions included wearing protective equipment when working with poultry, dairy cows or other animals that could be infected, and when handling raw and unpasteurized milk.

Recommended protective equipment includes National Institute for Occupational Safety and Health-approved respirators, goggles or face shields, coveralls, headgear, boots, and gloves.

There are currently a total of 60 confirmed bird flu cases nationwide. Although the majority of cases are from California, other states with confirmed cases include Colorado, Michigan, Missouri, Oregon, Texas and Washington, according to the Centers for Disease Control and Prevention.

Symptoms of bird flu – which comes from a type of influenza A virus – include pink eye or conjunctivitis, fever, fatigue, cough, muscle aches, sore throat, nausea and vomiting, diarrhea, stuffy or runny nose, and shortness of breath. Most recent cases of bird flu caused conjunctivitis and mild respiratory symptoms, the Cleveland Clinic said on its website.

Treatment for bird flu typically consists of antiviral medications such as oseltamivir, peramivir, or zanamivir.