Thank you so much Donuel.
I've heard of many people who just can't seem to get rid of the lung problem. I sometimes look at Mumsnet (mainly women's comments) and there's a thread there called 'Covid Lungs'. The thread has filled to the 1000 maximum several times, with countless women still struggling several weeks/months after contracting Covid19.
I think, from what my sister has said, that the virus actually damages the lung tissue, and this can cause lasting health problems.
All the more reason for everyone to Stay Safe, stick to Lockdown and obey the rulings. It's tedious, but these health repercussions are so much worse.