Improved vector control of Triatoma infestans limited by emerging pyrethroid resistance across an urban-to-rural gradient in the Argentine Chaco

Table 1 Type of triatomine survey and house spraying by type of environment and date over the second period, Avia Terai 2015–2019

Years post-spraying (date)	Environment	Type of vector survey	Type of spraying	Type of searches between surveys
0 (Feb 2016)	Urban	Stratified sample^a	Infested + adjacent	–
0 (Dec 2015–Mar 2016)	Peri-urban	Stratified sample^a	Infested + adjacent	–
0 (Oct 2015)	Rural	Complete	Complete	–
1 (Mar–May 2017)	Urban	Stratified sample^b	Infested blocks	HN
1 (Mar–May 2017)	Peri-urban	Complete	Infested blocks	HN
1 (Nov 2016)	Rural	Complete	Focal	HN
2 (May 2018)	Peri-urban	Complete	Infested blocks	HN
2 (Dec 2017)	Rural	Selective^c	Focal	Selective^c, HN
3 (Dec 2018)	Rural	Incomplete	Incomplete	HN
4 (Nov 2019)	Rural	Complete	No	HN

HN householder notification of the presence of triatomines in the dwellings
^aAll high-risk houses according to the risk stratification index, and 30% of low-risk houses
^bAll high-risk houses according to the risk stratification index, 30% of low-risk houses, and all houses within an infested block
^cIncluding inhabited houses infested with T. infestans in the preceding survey

ISSN: 1756-3305