Description for medicine or protocol of treatment in detail:
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Subjects who meet the inclusion criteria will be randomly assigned to the placebo and probiotic groups at 1:1. The main results were as follows:
(1) probiotics group: the same batch of Culturelle capsules provide by American i-Health will be swallowed with warm water at < 36 degree C, one tablet a day, once a day, the test period was 4 weeks, and the follow-up period was 24 weeks. Store in 4 degree C refrigerator.
(2) probiotics placebo: the probiotics placebo will be made by the placebo Experimental Center of the College of Pharmacy of Chengdu University of traditional Chinese Medicine, probiotics placebo will be swallowed with warm water at < 36 degree C, one tablet a day, once a day, the trial period was 4 weeks, and the follow-up period was 24 weeks. Store in 4 degree C refrigerator.
(3) the probiotics group and placebo group capsules will be packed with the same label, each box containing a dose of 4 weeks, and the clearly visible label on each package stated "trial only" and other information: name, dose, administration schedule, storage condition indication, expiration date and manufacturer name. The reception, handling, storage and distribution of drugs are the responsibility of Dr. Zhang Chen, a pharmacist.
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Inclusion criteria
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Inclusion criteria of high exposure population:
(1) Sanitation workers and traffic guides working in traffic pollution environment in Chengdu, age: 22 to 65 years old, male and female are not limited, fixed post working years >= 3 years, fixed place working time >= 8 hours;
(2) there was no history of gastroenteritis in the past month;
(3) no hormones and antibiotics were used in the past month;
(4) no nasal spray or other probiotics (such as lactic acid bacteria, bifidobacterium, etc.) yoghurt and beverage were used in the past 3 months;
(5) clinical examination of lip, throat, ear, nostril (especially anterior nostril) and neck, no lymph node enlargement, inflammation, polyp, mass, runny nose, etc;
(6) no chronic constipation (defecation < 3 times a week) and hemorrhoids.
Inclusion criteria of low exposure population:
(1) the staff of Chengdu Urban Environmental Hygiene Administration Bureau working indoors and the staff of Chengdu Traffic Administration Bureau working indoors (with air conditioning), age: 22 to 65 years old, male and female; Fixed post working years >= 3 years, fixed place working time >= 8 hours;
(2) there was no history of gastroenteritis in the past month;
(3) no hormones and antibiotics were used in the past month;
(4) no nasal spray or other probiotics (such as lactic acid bacteria, bifidobacterium, etc.) yoghurt and beverage were used in the past 3 months;
(5) clinical examination of lip, throat, ear, nostril and neck (especially anterior nostril), no lymph node enlargement, inflammation, polyp, mass, runny nose, etc;
(6) no chronic constipation (defecation < 3 times a week) and hemorrhoids.
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