Majoritatea cazurilor au apărut la câteva luni de la terminarea Primului Război Mondial, însă se crede că epidemia ar fi început mai devreme, în 1915-1916. Iniţial, principala cauză a bolii a fost considerată iperita, un agent chimic utilizat în timpul războiului.
O desscriere a misterioase boli a fost dată de neurologul din Viena Constantin von Economi. ”Ne confruntăm cu un timp de afecţiune a somnului care are un parcurs neobişnuit de lung. Primele simptome sunt în general acute, dureri de cap şi indispoziţie. Apoi apare o senzaţie de somnolenţă, deseori asociată cu delir. Delirul şi somnolenţa pot duce la moarte în câteva săptămâni sau se poate tranforma în comă’,’ scria von Economi, potrivit descopera.ro.
Odată cu trecerea anilor, „boala somnului” a început să se propage și a afectat oameni de toate vârstele. Simptomele: dureri de cap, febră, senzaţie de oboseală şi secreţii nazale. Adică asemănătoare cu cele ale gripei.
Cazurile de oameni care sufereau de „boala somnului” au început să se diminueze în următorii 10 ani, însă virologul John Oxford a susținut că afecţiunea nu a dispărut încă. Încă un caz a fost înregistrat în anul 1993, la o tânără care s-a recuperat în câțiva ani.
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