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Encephalitis is inflammation of the brain. It is a viral disease. It may be caused by herpes simplex virus or rabies virus. Common symptoms include a headache, fever, confusion, vomiting, seizures, hallucinations, etc. Kala-azar disease is also known as Visceral leishmaniasis. It is caused by parasite Leishmania donovani and transmitted by the sand fly Phlebotomus argentipes. The larval stage of Ascaris lumbricoides is called as Rhabditiform larvae as it appears similar to the soil nematode, Rhabditis found in soil and human faeces.