An avian flu outbreak, which killed several elephant seals at California’s Año Nuevo State Park last month, has spread to two other mammal species, according to researchers.

The threat of highly pathogenic avian influenza (HPAI), commonly referred to as ‘bird-flu’, has increased in the North Texas region, according to wildlife experts.

The cluster of infections appears confined to an area of San Mateo County, and no cases have been detected at Point Reyes National Seashore.

HPAI was detected earlier this year in two instances in Walker County and once in Hart County. Commissioner Tyler Harper said Friday the state now is free of HPAI.