First of all, that's not really true. It's winter in Australia and the Australian emetophobics are scared as hell right now. They're also traveling to the northern hemisphere by the plane load, and will bring the virus with them (sorry Aussies, I don't mean to blame - lol). Secondly, even if it is true that there are less "stomach bugs" about, that very fact is making your phobia worse.
It's true. The one thing that causes phobias for sure is avoidance. The more you avoid what you fear, the more afraid of it you'll become. I believe this is why emetophobia is so severe in most people who have it. Adults naturally "avoid" vomiting because they just don't vomit very often. Once every few years if you don't like it; once every 20 or so if you downright hate it; and if you're emetophobic you can go for a lot longer. But this "natural avoidance" as I like to call it is doing more harm than good. If adults were sick every few weeks, before long you'd probably not be afraid of it.
So how do I not avoid it when I'm so afraid of it, you ask? Good question. The best way is to start a program of gradual exposure which gets you talking about, and looking at, vomiting every week somehow. My program, as you can see from the "Resource" page, is very VERY gradual. It starts with just looking at the word "vomit" and goes on to drawings of cartoon people just not looking well, etc. But it's exposure nonetheless. And it gets you away from that dreaded avoidance which is only making you worse.
My best advice to northerners is to GET HELP NOW when the season is calming you down some. Don't wait until September when you send the kids back to school and freak out! It's much better and easier to get a good "run at it" in the summer so that by the time fall rolls around you will have some skills and tools to use to ease your anxiety.
Good luck everyone!