@Utini
Thanks for the link. I don't understand it though.
British researchers who tested people for influenza antibodies before and after each flu season for 5 years found that an average of 18% of them appeared to have contracted a flu infection each season, but only 23% of that group got sick, according to a report in The Lancet Respiratory Medicine.
Okay, that much I understand, shunning they addres the same flu strain and not a weak socsi from a previous strain. The next bit though I don't understand:
The scientists also found that further tests confirmed flu in only 25% of those whose serologic tests indicated infection,
So presumably the serologic were antibody blood tests? But of those with antibodies only 25% were confirmed to have had the flu? Why did they have antibodies then? What were the further tests?
Interesting though, thank you, I always assumed that if you had the flu you properly had it. Apologies for misinformation, though I still maintain if you have the flu (and are symptomatic I'll now add as acaveat) you are not walking around and about, but clearly I don't know enough the infection/antibody thing. I'll try and find a dummies guide somewhere.