Data analysis: Japanese encephalitis is an acute infectious disease of central nervous system caused by virus. Mosquitoes are the main media.

(1) Infectious diseases refer to diseases caused by pathogens, which can spread among organisms and are characterized by infectivity and epidemic.

(2) Japanese encephalitis is a blood infectious disease, spread by mosquitoes, which mostly occurs in summer and autumn. Pathogens refer to bacteria, viruses and parasites that cause infectious diseases. Japanese encephalitis virus is the pathogen of the disease. From the immunological point of view, Japanese encephalitis virus belongs to antigen.

(3) Measures to prevent infectious diseases include controlling the source of infection, cutting off the route of transmission and protecting susceptible people. As can be seen from the above, JE is a blood infectious disease, which is spread by mosquitoes and is more common in summer and autumn. From the point of view of cutting off the transmission route, we should pay attention to environmental hygiene and eliminate mosquitoes. Cutting off the route of transmission is the way to prevent infectious diseases.

So the answer is: (1) infectivity; epidemic

(2) blood; ? Pathogen; Antigen?

(3) cut off the route of transmission