Editing Asthma (section)

==Prevention==
The evidence for the effectiveness of measures to prevent the development of asthma is weak.<ref name="NHLBI07p184" /> The [[World Health Organization]] recommends decreasing risk factors such as tobacco smoke, air pollution, chemical irritants including [[perfume]], and the number of [[lower respiratory infections]].<ref name=WHO2017Fact>{{cite web|title=Asthma |url=https://www.who.int/mediacentre/factsheets/fs307/en/ |website=World Health Organization |access-date=May 30, 2017 |date=April 2017 |url-status=dead |archive-url=https://web.archive.org/web/20110629035454/http://www.who.int/mediacentre/factsheets/fs307/en/ |archive-date=June 29, 2011 }}</ref><ref>{{cite journal | vauthors = Henneberger PK | title = Work-exacerbated asthma | journal = Current Opinion in Allergy and Clinical Immunology | volume = 7 | issue = 2 | pages = 146–51 | date = April 2007 | pmid = 17351467 | doi = 10.1097/ACI.0b013e328054c640 | s2cid = 20728967 }}</ref> Other efforts that show promise include: limiting smoke exposure [[Uterus|in utero]], [[breastfeeding]], and increased exposure to daycare or large families, but none are well supported enough to be recommended for this indication.<ref name="NHLBI07p184">{{harvnb|NHLBI Guideline|2007|pp=184–85}}</ref>

Early pet exposure may be useful.<ref name="pmid22235226">{{cite journal | vauthors = Lodge CJ, Allen KJ, Lowe AJ, Hill DJ, Hosking CS, Abramson MJ, Dharmage SC | title = Perinatal cat and dog exposure and the risk of asthma and allergy in the urban environment: a systematic review of longitudinal studies | journal = Clinical & Developmental Immunology | volume = 2012 | pages = 176484 |year=2012 | pmid = 22235226 | pmc = 3251799 | doi = 10.1155/2012/176484 | doi-access = free }}</ref> Results from exposure to pets at other times are inconclusive<ref name="pmid20053584">{{cite journal | vauthors = Chen CM, Tischer C, Schnappinger M, Heinrich J | title = The role of cats and dogs in asthma and allergy—a systematic review | journal = International Journal of Hygiene and Environmental Health | volume = 213 | issue = 1 | pages = 1–31 | date = January 2010 | pmid = 20053584 | doi = 10.1016/j.ijheh.2009.12.003 | bibcode = 2010IJHEH.213....1C }}</ref> and it is only recommended that pets be removed from the home if a person has allergic symptoms to said pet.<ref name=Au2005/>

Dietary restrictions during pregnancy or when breastfeeding have not been found to be effective at preventing asthma in children and are not recommended.<ref name=Au2005>{{cite journal | vauthors = Prescott SL, Tang ML | title = The Australasian Society of Clinical Immunology and Allergy position statement: Summary of allergy prevention in children | journal = The Medical Journal of Australia | volume = 182 | issue = 9 | pages = 464–7 | date = May 2005 | pmid = 15865590 | doi = 10.5694/j.1326-5377.2005.tb06787.x | others = Australasian Society of Clinical Immunology and, Allergy | s2cid = 8172491 }}</ref> Omega-3 consumption, [[Mediterranean diet]] and antioxidants have been suggested by some studies to potentially help prevent crises but the evidence is still inconclusive.<ref name="BertrandSánchez2020">{{cite book | veditors = Bertrand P, Sánchez I | date = January 31, 2020 | title = Pediatric Respiratory Diseases: A Comprehensive Textbook | publisher = Springer Nature |chapter=Asthma: Treatment| vauthors = Bertrand P, Faccin AB |pages=415–428| doi = 10.1007/978-3-030-26961-6 | isbn = 978-3-03-026961-6 | s2cid = 210985844 | url = https://link.springer.com/book/10.1007%2F978-3-030-26961-6}}</ref>

Reducing or eliminating compounds known to sensitive people from the workplace may be effective.<ref name=Baur2012/> It is not clear if annual [[influenza vaccines|influenza vaccinations]] affect the risk of exacerbations.<ref>{{cite journal | vauthors = Cates CJ, Rowe BH | title = Vaccines for preventing influenza in people with asthma | journal = The Cochrane Database of Systematic Reviews | volume = 2 | issue = 2 | pages = CD000364 | date = February 2013 | pmid = 23450529 | doi = 10.1002/14651858.CD000364.pub4 | pmc = 6999427 }}</ref> Immunization, however, is recommended by the World Health Organization.<ref>{{cite journal | title = Strategic Advisory Group of Experts on Immunization - report of the extraordinary meeting on the influenza A (H1N1) 2009 pandemic, 7 July 2009 | journal = Relevé Épidémiologique Hebdomadaire | volume = 84 | issue = 30 | pages = 301–4 | date = July 2009 | pmid = 19630186 }}</ref> Smoking bans are effective in decreasing exacerbations of asthma.<ref name="Effect of smoke-free legislation on">{{cite journal | vauthors = Been JV, Nurmatov UB, Cox B, Nawrot TS, van Schayck CP, Sheikh A | s2cid = 8532979 | title = Effect of smoke-free legislation on perinatal and child health: a systematic review and meta-analysis | journal = Lancet | volume = 383 | issue = 9928 | pages = 1549–60 | date = May 2014 | pmid = 24680633 | doi = 10.1016/S0140-6736(14)60082-9 }}</ref>