It is based on google searches for flu symptoms.
It tend to correlate with the trends of flu in USA.
The trend is indeed worrying.
There is no increase in the activity of flu symptoms and yet the
number of deaths and intensive care unit admissions, is much higher.
It shows that Swine flu has taken over common flu but is more deadly
Unless we have figures to prove that current swine flu deaths are
similar to previous year's flu deaths at the same time.