Well, I live in Tigre. I spent my very first 6 months here (Oct-Apr 2014-2015) and after living in the western zone, I came back to Tigre at the end of March, 2016 - and have remained here for the past 7 months, now - so over 1 year, altogether in total.
*I* live in centro / municipalidad de Tigre (not simply in the partido de Tigre, which is quite large; or on the islands) which means 'downtown' Tigre. At first, I rented a place half-a-block away from Rio Tigre and immediately behind and adjacent to Parque de la Costa (it was on Vivanco - across from the side of the Vivanco restaurant and only metres away from the amusement park, casino, theatre, Puerto de Frutos traffic entrance). In that location, during summer-time, I was particularly careful and had NO mosquitos inside the brand-new apartment I lived in there, which came with a mosquito screen door on both sides, for the balcony. THIS time, however, I'm now living on the main street (Cazon) just 2 blocks away from the Rio Tigre, and equally distant from that central traffic circle and the Mitre line train station (the line for which - Retiro - runs directly behind the building I live in, about 50 metres away). I bought my own mosquito screen door for the balcony, here (though just one) and I have only opened my balcony door about 3 times, for seconds, in the past few months...
Yet, I have had about 2-3 mosquitos inside here, already (I also have BIG spiders). This place is absolutely brand-new, BTW.
One anomaly I've noted is that we have a very noticeable public education campaign about ZIKA and about DENGUE in these parts (on signs, billboards, etc) yet every time it rains, there's MASSIVE flooding in the streets - some people wear waders in it and the water level is curb-high - which takes 1-2 days to dwindle back down to dry pavement, again! Also, whenever there's that southern wind, here, the Tigre river overflows its banks, sometimes considerably! THAT can take a day to dry on MY side of the river, but on the Reconquista side, it can take several days for the overflow water to go down!
Now, when people usually reference the Tigre mosquito situation, I THINK they're more than likely talking about the Delta Island population more than anywhere else. And, I'm sure that's different - but here in 'downtown' Tigre, I surely cannot say that I know everything that's going on, but I have not heard / read of any cases recently, here. There were a very few cases during my first stay here, though - and by few, I think I noted 2 or 3 in total.
Paul