मानसिनाव सन्देरनाय बेरामनि गिबि नंगुबै जानायखौ 1964 आव सिम्पसनआ सिनायथियो, जाय गावनो थाम्फैनिफ्राय भायरासखौ आलादा खालामनाय समाव सन्देरजादोंमोन।
The first true case of human infection was identified by Simpson in 1964, who was himself infected while isolating the virus from mosquitoes.