Is Sweden full of mosquitoes during the summer?

I've lived at the place in Sweden with the most mosquitos and I'm a certified ecologist.

Sweden is a fairly large country. To know if Sweden will be "full of mosquitos" where you will be you need to know why there are mosquitos at some places.

You can only find mosquitos near water sources like lakes, rivers and bogs. If you're not close to any water then you'll not find any.

Mosquitos also need air that isn't moving. Southern of Sweden is full of fields which makes it an unnatural habitat and they'll be hard to find. But near ditches with trees you'll still find them.

If there's sunlight you shouldn't see them either, so dress up at dawn and use protection like sprays. If you're in a house there are devices you can plug into the socket that emit a smell they don't like.

Having read this you'll know what to expect - also you'll never find yourself covered in mosquitos like the person below.

Swedish mosquitos don't carry any diseases at all. If you can, let them suck the blood once they have started - it will prevent most of the itching. You can find "Salubrin" at pretty much any shop, apply it on the itching location and the itching will go away.

Don't worry and enjoy your holiday. I will!

Some info:

Mosquitoes. Yes, Sweden can be full of mosquitoes, especially near still standing water such as a wet forest. However, the density strongly differs from one place to another and from one time to time. A little wind can make a huge difference. Some places are so full that the best is to keep moving, in other places one can have a pick-nick without any problem. If you want to avoid getting stung, use an insect repellant with DEET.

Midges The bite of these small flies differs from a mosquito because it hurts more. In general, these occur more locally, but if they occur then usually in large numbers.

Ticks Ticks are totally different from mosquitoes and midges because they are actually related to spiders. They can't fly and crawl up your shoes and pants to find your skin to bite. There they will stay for a few days to suck blood, unless you remove them. You should do this asap, because that decreases the chance of getting Lyme disease. An insect-repellant with DEET also works against thicks; there are even trousers and socks with DEET, this actually works very well in my experience.

I'm baffled by your doctor suggesting the three syringes, as there is no vaccine against Lyme. I think your doctor was thinking of tick-borne encephalitis, which requires three syringes. I find this rather far-fetched, but can't really advise you on this.

Source: I've travelled to Sweden a number of times and am actually going there this summer. I am also a European field biologist, and as such, belong to a risk category for Lyme disease (we get Lyme tests every year). And I do go into nature as much as I can and do not always stay on the track.