The California coast is seeing the second largest outbreak of sick sea lions in recorded history. Since January, 19 sea lions infected with leptospirosis, a potentially fatal bacterial infection, have been picked up on Marin County shores. The Sausalito-based Marine Mammal Center has responded to 220 infected sea lions—more than half of all those rescued this year across the state. The center is warning beachgoers to be especially careful to stay away from any stranded…