Argentina fights against vast swarms of mosquitoes blamed for dengue surge

Tens of thousands of dengue cases recorded this year as high temperatures and rainy weather create perfect formula' for bugs

In his 20 years cleaning the Buenos Aires subway, Mauricio Rios, 52, had never seen anything like it: a vast and noisy swarm of mosquitoes churning in dark clouds the length of the platform at Piedras station.

Rios pulled out his phone and filmed the growing swarm for half a minute, before rushing to the break room, contacting his superior and shutting down the station.