This same year, occurrence of 16 cases over a period of two years (1963–1965) was reported in Ústí nad Labem.
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In the conclusion of the episode, Cameron, acting as Foreman's medical proxy, performs a white-matter brain biopsy and the condition is revealed to be primary amoebic meningoencephalitis caused by Naegleria, a water-borne parasite that, upon being inhaled, attacks the brain.