<prompt> Which of the following disease with bird, ahropod and human chainMalariaJapanese encephalitisParagonimusPlague  <response>: Agent factors :- Caused by group B arbovirus flavivirus The main reservoirs are Ardeid birds and pigs Pigs are amplifiers of the virus and they do not manifest ove symptoms but circulates the virus Host factors :- Most common in the age group of 15 years of age Man - incidental dead end host Affects other animals also and horse is the only animal which does not shows symptoms of encephalitis Vector:- Transmitted by culex tritaeniorrhynchus - most impoant vector, others are C.Vishnuii and c. Gelidus Incubation period is 5-15 days Case fatality rate - 20-40 Ref:- K Park, 24th ed; pg num:- 302-303 