Table 1.

Recommendations regarding allergen avoidance according to different asthma guidelines

Guideline	Advice regarding allergen avoidance
NHLBI (2007) [9]	“Recommend multifaceted approaches to control exposures to which the patient is sensitive; single steps alone are generally ineffective.”
GINA (2020) [10]	“Allergen avoidance is not recommended as a general strategy in asthma. For sensitized patients, there is limited evidence of clinical benefit for asthma in most circumstances with single-strategy indoor allergen avoidance.”
BTS/SIGN (2019) [11]	“Physical and chemical methods of reducing house dust mite levels in the home (including acaricides, mattress covers, vacuum cleaning, heating, ventilation, freezing, washing, air filtration, and ionizers) should not be routinely recommended by healthcare professionals for the management of asthma.”
NICE (2017) [12]	Emphasis on pharmacological treatment; no mention of environmental control measures.