Ascaris larvae or eggs may be found in sputum is a clinical symptom of pulmonary ascariasis, and ascaris larvae or eggs may be found in sputum examination. Ascaris lumbricoides is the most common parasite in humans. The estimated number of people infected with Ascaris lumbricoides worldwide is 1.3 billion. The average infection rate of Ascaris lumbricoides in China is 2.7%-98.4%, and the infection rate in most rural areas of China is more than 60% in heavily endemic areas, and the highest infection is in the age group of 3-10 years. The examination items for which roundworm larvae or eggs may be found in sputum: 1. Direct smear method for parasite examination The direct smear method for parasite examination is an auxiliary examination method used to examine parasites. Stool examination is a common pathogenic test for the diagnosis of parasitic diseases. It is used to examine helminth eggs, protozoan encysts and trophozoa. The method is simple and the detection rate can be improved by making 3 consecutive smears. This test can be used to determine the corresponding disease signs. 2.Egg count method Egg count is an auxiliary test for parasite examination. The egg count is used to estimate the degree of parasite infection in the human body and is often performed by Stoll’s method, i.e. Stoll’s dilution egg count. This test can be used to determine the corresponding signs of disease. The ring egg sedimentation test is an auxiliary test used to check for parasites. When the antigen leaks out of the egg and interacts with the serum of a schistosome infected person, a specific precipitate is formed around the egg, which is a precipitation reaction. It is an auxiliary examination method for parasite examination. 4.Modified Kato method The modified Kato method is an auxiliary examination method for parasites. The principle is to use quantitative or qualitative thick smear of feces to increase the number of eggs in the field of view, which can be used for quantitative examination of eggs. After treatment with glycerol and peacock green, the fecal film is made transparent, thus creating a sharp contrast between the fecal residue and the eggs, which facilitates light transmission and microscopic examination. Malachite green then softens the visual field light to reduce eye fatigue. It is suitable for examination of various helminth eggs. The method is simple and the eggs are not dispersed during the operation. The results are better. Too hard and too thin stools are not suitable for this method. Frothy stools will form many tiny bubbles under the cellophane, which will hinder microscopic examination. It can also be used for quantitative examination of eggs. This phase examination can be used to determine the corresponding signs of disease. Hookworm culture method Hookworm culture method is an auxiliary examination method used to examine parasites. It is also called test tube filter paper culture method. Under suitable temperature and humidity conditions, hookworm eggs develop and hatch larvae within a few days, usually after 3 to 5 days, and can be observed with the naked eye or magnification, the detection rate is 7 times that of the direct smear method, and is also better than the saturated saline floating aggregation method. This phase examination can be used to determine the corresponding signs of disease.