Case report . The patient was a 70-year-old man who born and bred in a suburb of Wuhan, China, and both agriculture and industry exist in his surroundings. He had undergone lumbar disc surgery, rheumatoid arthritis, hypertension, and lacunar infarction. On April 26, 2021, he accidently fell into a pond (standing water) in a field (Figure S 1 ). Aspiration and choking occurred spontaneously, and then fever, cough and expectoration started to appear. The highest body temperature reached 39...