Chikungunya virus infection amongst the acute encephalitis syndrome cases in West Bengal, India

Chikungunya virus (CHIKV) infection from the acute encephalitis syndrome cases is an uncommon form and has been observed in the year 2010-11 from West Bengal, India. The case–1 and case–2 had the acute encephalitis syndrome; case–3 was of acute disseminated encephalomyelitis whereas the case–4 had the symptoms of meningo-encephalopathy with bulbar involvement. We are reporting four cases with neurological complications involving central nervous system (CNS) due to CHIKV infection from this state for the first time. The virus has spread almost every districts of this state rapidly. At this stage, these cases are public health threat.