You need to be particularly careful if you live within a couple of km or so of any airport. Malaria can be easily imported. There was
a case a few years ago of a bloke in Meyrin, Geneva who died of malaria and he had never left the country.
Don't forget that Cyprus was noted as a terrible malaria hotspot until the 1946-53 eradication campaign, where every mm² of the whole island was sprayed with DDT twice a year, inside and out. Unfortunately, it had enormous effects on other species, including many predatory insects. The whole entomology of the island was changed and this, in turn, changed the vegetable species with changes in pollination vectors. It is possible that the dramatic reduction in raptors since the early 1950s may also be partially ascribed to DDT in the food chain. It is possible that it could reintroduce itself.
Window screens are useless: the small beast fly straight through the mesh. The larger mosquitoes are strong enough to bash their way through the mesh.
Where we are, it is not mosquitoes that are the problem. We have two vicious biters. One is a fly that looks like an ordinary housefly, perhaps a tad smaller. It digs its proboscis in and leaves behind a good dose of poison. On some occasions, I've seen red swellings a good 5 cm across. It is worst in the afternoon. The other is the ubiquitous no-see'um. This is a gnat, about 1½ mm long, flesh coloured body, small rounded wings. It is very difficult to see against the body and it will have left before you start to feel an intense itch. If you do not touch it, the itch goes away after ~30 minutes, but it can last for over a day if you keep scratching it.