Parvovirus on Coast

There is a small sign posted at the end of Ocean Blvd. in Moss Beach where people park to go onto the POST bluff top trail. The sign says that the trail has been exposed to Parvo. From PetMD: "the virus is transmitted either by direct contact with an infected dog, or indirectly, by the fecal-oral route. Heavy concentrations of the virus are found in an infected dog’s stool, so when a healthy dog sniffs an infected dog’s stool, it will contract the disease." I don’t know who posted the note - it’s not from any agency, just a hand lettered sign. Maybe someone knows more about this.