MONTROSE, California — In the world’s most impoverished communities, danger lurks in flooded fields, muddy riverbanks and puddles outside homes. Leptospirosis, a bacterial disease transmitted from animals to humans, kills more…

MONTROSE, California — In the world’s most impoverished communities, danger lurks in flooded fields, muddy riverbanks and puddles outside homes. Leptospirosis, a bacterial disease transmitted from animals to humans, kills more…