Table 1.

Influenza A virus prevalence and seroprevalence in backyard production systems (BPS) in the Valparaiso, Metropolitan and Libertador General Bernardo O’Higgins regions, central Chile 2013–2015

Region	Test	Positive BPS (n)	Total BPS (n)	Prevalence (%)	95% CI (%)
Valparaiso	RT‐qPCR	5	61	8.2	0.8–14.0
	ELISA	12	61	19.7	9.9–30.6
	RT‐qPCR or ELISAb	13	61	21.3	10.1–31.7
Metropolitan	RT‐qPCR	3	72	4.2	0.0–8.8
	ELISA	25	72	34.7	23.1–46.2
	RT‐qPCR or ELISAb	25	72	34.7	23.1–46.2
LGB O'Higginsa	RT‐qPCR	18	196	9.2	4.8–13.1
	ELISA	23	196	11.7	7.2–16.4
	RT‐qPCR or ELISAb	36	196	18.4	13.3–24.2

Abbreviation: RT‐qPCR, real‐time reverse transcription PCR.

^aLibertador General Bernando O’Higgins.

^bPositive to either ELISA or RT‐qPCR.