to report this passenger to World Health or at least the airline?

[Quantumblue]

I am feeling quite ill and prepared to be wrong.
I recently flew from Stockholm to Singapore, 12 hours in economy. I got on the plane with a slight cold.
The passenger behind me, a girl in her 20s was really ill , quite obviously with flu. She moaned, coughed, sneezed for the entire journey. At no point did she cover her mouth. I could feel her germs just spraying around me.
Back home ( in Oz) I am now that sick. I have missed several days of work and a whole lot of other stuff. DH is now coming down with it.
Given that I still have my boarding pass so know what seat number she was in (in relation to me), is it worth contacting the airline to report this illness? I am sure that several rows of people around her are now ill.
Or is this just my exhausted fevered brain and everyone just accepts this as the risk of travel?

I flew on holiday in March and got a bug two days later. I have asthma. Just come out of hospital as it's progressed to pneumonia. I am sorely tempted to wear a surgical mask next time I fly.

DH flies approximately four times a month and is rarely sick.

He does wash his hands obsessively when he's travelling.

When you got on the plane, how did you know that your "slight cold" wasn't the start of "flu-like symptoms"?
Are you a doctor?

I always get a cold after flying. It’s the chance I take.