NEW DELHI, India (CNN) -- Doctors say an encephalitis outbreak has killed 130 people -- mostly children -- in northern India since January.



The outbreak of acute encephalitis -- an inflammation of brain tissue -- is mostly concentrated in eastern parts of Uttar Pradesh, said V.S. Nigam, the state's nodal officer for tackling the disease.



He told CNN that 640 patients had tested positive for the infection, including 30 with Japanese encephalitis, which is spread by mosquitoes.



Acute encephalitis can be spread in various ways, including a bacterial or viral infection; the ingesting of toxic substances; and complications of a disease.



The disease has mostly struck children up to 15 years old, Nigam added.
What is an inflammation of brain tissue called? where have these people been killed who many people have been killed Where did the outbreaks occur? what outbreak has killed 130 people What parts of Uttar Pradesh was the outbreak concentrated in? What caused the outbreaks?
Acute encephalitis northern India 130 in northern India an encephalitis eastern mosquitoes.
question: What is an inflammation of brain tissue called?, answer: Acute encephalitis | question: where have these people been killed, answer: northern India | question: who many people have been killed, answer: 130 | question: Where did the outbreaks occur?, answer: in northern India | question: what outbreak has killed 130 people, answer: an encephalitis | question: What parts of Uttar Pradesh was the outbreak concentrated in?, answer: eastern | question: What caused the outbreaks?, answer: mosquitoes.