Health officials in California have reported another human case of H5N1 bird flu, taking the total number of dairy farm workers who have been infected during the past week to six. All of the cases were caused by animal-to-human transmission. All six cases so far have been found in individuals who worked at dairy farms in the Central Valley, suggesting none of them were caused by human-to-human transmission, according to the California Department of Public Health (CDPH). Of the six cases, four have been confirmed by the Centers for Disease Control and Prevention (CDC). The other two have tested…