Merixus says people at the Kadara Port outpost are suffering from a widespread bacterial infection. This bacteria is native to Heleus, so perhaaps angaran antibiotics can treat it.
Speak to Merixus when you visit Aya afteer completing Hunting the Archon.
Buy the antibiotics from the Assistant Medic in the Infirmary on Aya, and deliver them to Merixus.
270 xp, 29 AVP, +2% Kadara viability.