In the 1999 West Nile virus outbreak in New York City, which of the following pieces of evidence suggested that the pathogen under investigation was not St. Louis encephalitis (SLE)?

A) The time characteristic was not suggestive of SLE.
B) There was no mosquito involvement in this disease, as there would have been for SLE.
C) The viral particles were too small to be SLE.
D) Control measures initiated to control a SLE outbreak were not effective.
E) The case-control study indicated that this was not SLE.