I saw this on Sky News yesterday. (Can't do a link, but if you go on Sky News page, there is an article about this).
Basically, the Army who are working on the front line helping the NHS etc., have been issued with a spray containing Citriodiol which is a mosquito repellent, as an extra source of protection, along with PPE etc. I know from a close family member that anti-malaria drugs are used in hospitals as one way to treat Covid - so again, a link to mosquitos.
Also, I know a lot of you have been on the Vitamin D thread, and the army have been advised to take Vit D to boost their immune systems.
Just thought you might be interested in this.
S