ഡാർജിലിംഗിലും കലിംപോങ്ങിലും മനുഷ്യരിൽ അന്ധതയ്ക്ക് കാരണമാകുന്ന ഒരു പ്രത്യേകതരം ഈച്ചയെ കണ്ടെത്തി. "ബ്ലാക്ക്" ഈച്ചകൾ എന്നറിയപ്പെടുന്ന ഈ ഈച്ചകൾ, ഓങ്കോസെർക്ക വോൾവുലസ് എന്ന വിരകളുടെ വാഹകരാണ്. ഈ വിരകളാണ് മനുഷ്യരിൽ അന്ധതയ്ക്ക് കാരണമാകുന്നത്.
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