Fig. 1
From: Dog importation and changes in heartworm prevalence in Colorado 2013–2017
![Fig. 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs13071-019-3473-0/MediaObjects/13071_2019_3473_Fig1_HTML.png)
Percent change in heartworm prevalence since 2013 in Colorado (circles) and in the USA (squares)
From: Dog importation and changes in heartworm prevalence in Colorado 2013–2017
Percent change in heartworm prevalence since 2013 in Colorado (circles) and in the USA (squares)