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This is Scientific American's 60-second science. I'm Christopher in Taliatta.

Chances are you've had the opportunity to study firsthand, the swollen, itchy welt left by a mosquito bite.

And now, scientists have two.

Well, we haven't studied itching yet in our laboratory studies.

Clive McKimmy, an immunologist at the University of Leeds in England.

What we've shown is that the inflammation associated with bites is not good for you as a host,

and it gives a virus an advantage. To understand why, let's back up to mosquito spit.

Now, I know it's a little disgusting to think about, but when a mosquito

bites you, it's actually spitting out quite a lot of saliva into your skin. That saliva can contain

viruses like Zika or chicken guinea, and viruses and the tissue damage from the bite are a rallying

cry for the immune system. McKimmy and his colleagues studied that immune response in mice,

and they found that when immune cells show up at the bite,

the viruses infect them and turn those immune cells into factories

for further virus replication.

Your own immune system, which is meant to help your body defend itself against infection,

seems to be inadvertently promoting

an aspect of a virus infection. Overall, the inflammation resulted in 10 times more virus in the mice,

...