(added on 2013/08/30)
Headaches near pig farms 豬場周邊的煩惱
Japanese encephalitis (JE) is a mosquito-borne viral infection, of which pigs and wild birds are the natural reservoirs. It poses public health threats in some South and South-east Asian countries.
In Hong Kong, there were 11 local JE cases and 5 imported cases since 2003. Most of the infections were reported in June and July. The hot and humid weather during this period favours breeding of the vector.
The map shows the distribution of all reported JE cases in Hong Kong in the past 10 years. As depicted by black solid dots, the majority were residents in Yuen Long District. Location of all eight cases in Yuen Long were within 2 kilometres of pig farms. Three local cases occurring in areas not in the proximity of pig farms may possibly be explained by their contacts with wild birds or infected mosquitoes brought through air currents.
Data for the map were extracted from media reports.