Table 2.

Classification of respiratory disease episodes from Acre state ambulatory visit records, 2013–2018

Disease class a	ICD-10 b	Approximate aetiology a	Aetiology source a	Freq. c
Asthma	J45-J46	Viral, bacterial, allergen-driven, pollution-exposure-driven but also genetic	[33–35]	4,08%
Acute bronchitis and bronchiolitis	J20-J21	Mainly viral, but bronchitis also may be bacterial	[36–39]	4,95%
Bronchitis, emphysema and other chronic obstructive lung diseases	J40-J44	Smoking and air pollution	[40–42]	6,12%
Chronic diseases of tonsils and adenoids	J35	Bacterial	[43]	0,01%
Acute pharyngitis and tonsillits	J02-J03	Bacterial or viral	[44, 45]	29,40%
Influenza or flu	J09-J11	Viral	[46]	14,38%
Acute laryngitis and tracheitis	J04	Bacterial or viral	[47–49]	0,26%
Other diseases of the respiratory system	J22, J66-J99	Indeterminate, as multiple diseases are included	Does not apply	6,69%
Other diseases of the nose and the paranasal sinuses	J30-J31, J33-J34	Idem	Does not apply	0,19%
Other diseases of the upper respiratory tract	J36-J39	Idem	Does not apply	0,00%
Other acute infections of the upper airways	J00-J01, J05-J06	Idem	Does not apply	26,77%
Pneumonia	J12-J18	Bacterial or viral	[50]	7,14%
Chronic sinusitis	J32	Bacterial	[51, 52]	0,001%
Total				100,00%

^aClassification in the first column was made by Acre state health professionals and in the second column by the authors relying strictly on references reported in the third column (patient, clinical and laboratory information could not be accounted for in the aetiological classification for being not available)

^bThe respiratory disease classes in the table are those adopted in the Brazilian National Health System, which correspond to aggregations of ICD-10 categories

^cBased on a total of 477,609 ambulatory visit episodes, approximately 79,000 episodes per year