A 2002 West Nile virus epidemic in the United States was the largest human encephalitis outbreak recorded in the Western Hemisphere at the time.
The main objective of this paper, therefore, is to perform exploratory cluster analysis using the England human encephalitis data set with the aim of achieving a better understanding of human encephalitis and generate hypotheses about etiology.
This would explain the recently discovered association of the most severe form of human encephalitis with the SIB strains [17].
St . Louisencephalitis virus (SLEV) was first discovered as the mosquito-borne agent responsible for over 1,000 cases of encephalitis during a 1933 summer outbreak in St . Louis Missouri) and now is a reemerging human pathogen widely distributed in the American continent, causing several human encephalitis outbreaks over the last 80 years.
Using data from the same prospective study presented in this paper, our group previously identified fever, personality and behavioural change, headache and lethargy, as the main characteristics of human encephalitis [ 10, 11].
If alert veterinarians and practicing physicians had not sought to identify the cause of the deaths of crows and of human encephalitis in New York City in 1999, health officials would probably have included the human cases in the large "cause undetermined" category of encephalitis.
The dark red colour in the heatmap indicates that fever and abnormal white blood cell counts (WCC) are indicated as the two major characteristics of human encephalitis.
Before 2005, the only recorded outbreak of human encephalitis caused by flaviviruses in this region was in 1975 in Brazil, which was attributable to Rocío virus (10 ).
In addition to human encephalitis and meningitis cases, the West Nile (WN) virus outbreak in the summer and fall of 1999 in New York State resulted in bird deaths in New York, New Jersey, and Connecticut.
Exploratory cluster analysis is implemented with the aim of identifying sub-groups in human encephalitis.
