Your limerick is nice, it has the basics down, is the right length, and has the right rhyme scheme. The meter is a little off, though- your first, second, and last line should have between seven and nine syllables, and the third and fourth lines should have between five and seven.
Technically, your first line is too long by two syllables. You do have the right rhythm, though (u u / u u / u u / u u /). I don't know how strict the guidelines are- you may want to change it.
Lines 2-4 are good rhythmically. Line 4 is a little unclear grammatically- "a place with little swine case" is not good English, but for the sake of the limerick, I'd say it's alright. Unfortunately I don't have a better example off the top of my head... sorry.
The meter in line 5 is off. You should change this- the meter should be similar to line one; instead, you have u / u u u / u u / u / /. Try to rework your meter here into the u u / u u / u u / u u / pattern. Also, it should be "invested in", not "invested on".
As for the description:
about one of the recent health issue
should be "about a
recent health issue"
The swine flu also known as H1N1
The swine flue,
Airport has been one of the worst place
Airports have been some
of the worst places
The theme of my poem is about how fear makes people to make stupid mistakes.
You may want to develop this a little- while I can see what you mean, you haven't supported that at all in your description. Add one or two sentences about the theme.
The other sentences are okay- a little choppy, but pretty good overall. Also, it looks like your last sentence is cut off- did you mean to post more?
It's looking good-just a little work and you'll be in good shape!
Hope this helped.