We have better drugs and healthcare to deal with it. I thinks lot of people due from complications caused by flu such as pneumonia etc and we are better able to treat that kind of condition.
Actually we don't have much in the way of drugs to treat flu, it is now, as it was 100 years ago, mainly treating the symptoms.
Healthcare is better for more serious complications and people can be intubated these days, but it's not a case of going to hospital and being cured.
I guess it would spread more rapidly because of international travel.
Not necessarily, it could get further faster but one of the reasons the 1918 epidemic spread so far so quickly was soldiers being in close confinement and then being shipped home in close confinement.
There were men who had survived years of war who then died of flu before getting home.
Also people wanted to party, they had just come through years of war, if your relative(s) did come home you would invite the entire family round or if you were richer you might hold a party.
This is one thing that could make a huge difference, housing is so much better. If yo have flu you can go to bed. As long as you can drag yourself to the toilet and get a drink you are not going to be sneezing on other people.
If you were a family sharing the same room and the same bed you couldn't get away and even if you did have room to be on your own someone needed to bring you water and empty the chamber pot.
I agree with most of milk monitor's post, except I'd add that you can have your prescriptions delivered to you.
There's a really interesting drama doc, actually more of a documentary with bits of drama on you tube.
They took records of an outbreak of fly in a Canadian city and then applied it to real life eg instead of a train driver bringing the flu it was a flight attendant who was patient zero.