I think in most circumstances, 2 weeks illness would qualify as some level of 'extreme' -- that's rarely something not serious. So you and the parent are probably in agreement.
I'd guess for an average person aged 40 to 60, two consecutive weeks off would be a one in maybe five years kind of event. Any minor surgery, mental health, cancer treatment, heart issue or significant infection like shingles, pneumonia, mono, hep could easily lead to two weeks off.
Two weeks definitely isn't an every year thing for most people but it's certainly not extreme.
Some jobs coughing and whatnot is frowned upon.
I bet there's things you've heard of in the south that i've never heard of, too.